SHORT TERM INVESTMENTS TRUST (Form: 485BPOS, Received: 12/14/2011 17:13:21)

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.27

Fee Waiver and/or Expense Reimbursement ²		0.05

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.22


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.22% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	23	$	82	$	147	$	338

Principal Investment Strategies of the Fund

The Fund invests in high-quality U.S. dollar-denominated short-term debt obligations, including: (i) securities issued by the U.S. Government or its agencies; (ii) bankers’ acceptances, certificates of deposit, and time deposits from U.S. or foreign banks; (iii) repurchase agreements; (iv) commercial paper; (v) municipal securities; and (vi) master notes.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with Security and Exchange Commission (SEC) rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may invest up to 50% of its total assets in U.S. dollar-denominated foreign securities. The Fund may also invest in securities, whether or not considered foreign securities, which carry foreign credit exposure.

In selecting securities for the Fund’s portfolio, the portfolio managers focus on securities that offer safety, liquidity, and a competitive yield. The Adviser conducts a credit analysis of each potential issuer prior to the purchase of its securities. The portfolio managers manage liquidity, for instance, by trading in daily and weekly variable-rate demand notes.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

As with any mutual fund investment, loss of money is a risk of investing. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other governmental agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, you may lose money by investing in the Fund. The risks associated with an investment in the Fund can increase during times of significant market volatility. The principal risks of investing in the Fund are:

Counterparty Risk . Individually negotiated or over-the-counter derivatives are also subject to counterparty risk, which is the risk that the other party to the contract (such as a futures contract or swap agreement) will not fulfill its contractual obligations, which may cause losses or additional costs to the Fund.

Credit Risk . The issuer of instruments in which the Fund invests may be unable to meet interest and/or principal payments, thereby causing its instruments to decrease in value and lowering the issuer’s credit rating.

Foreign Credit Exposure Risk . U.S. dollar-denominated securities carrying foreign credit exposure may be affected by unfavorable political, economic or governmental developments that could affect payments of principal and interest.

Foreign Securities Risk . The value of the Fund’s foreign investments may be adversely affected by political and social instability; changes in economic or taxation policies; difficulties when enforcing obligations; decreased liquidity; and increased volatility. Foreign companies may be subject to less regulation resulting in less publicly available information about the companies.

1 Short-Term Investment Trust

those industries, which may be affected by the following factors: the supply of short-term financing; changes in government regulation and interest rates; and overall economy.

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Market Risk . The prices of and the income generated by the Fund’s securities may decline in response to, among other things, investor sentiment; general economic and market conditions; regional or global instability; and currency and interest rate fluctuations.

Money Market Fund Risk . Although the Fund seeks to preserve the value of your investment at $1.00 per share, you may lose money by investing in the Fund. The share price of money market funds can fall below the $1.00 share price. You should not rely on or expect the Fund’s adviser or its affiliates to enter into support agreements or take other actions to maintain the Fund’s $1.00 share price. The credit quality of the Fund’s holdings can change rapidly in certain markets, and the default of a single holding could have an adverse impact on the Fund’s share price. The Fund’s share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. Further regulation could impact the way the Fund is managed, possibly negatively impacting its return. Additionally, the Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities.

Synthetic Securities Risk . Fluctuations in the values of synthetic instruments may not correlate perfectly with the instruments they are designed to replicate. Some synthetic instruments are more sensitive to interest rate changes and market price fluctuations than others. These instruments may be subject to counterparty risk and liquidity risk.

U.S. Government Obligations Risk . The Fund may invest in obligations issued by U.S. Government agencies and instrumentalities that may receive varying levels of support from the government, which could affect the Fund’s ability to recover should they default.

Variable-Rate Demand Notes Risk . The absence of an active secondary market for certain variable and floating rate notes could make it difficult to dispose of the instruments, and a portfolio could suffer a loss if the issuer defaults during periods in which a portfolio is not entitled to exercise its demand rights.

Performance Information

The bar chart and performance table provide an indication of the risks of investing in the Fund. The bar chart shows changes in the performance of the Fund from year to year as of December 31. The Fund’s past performance is not necessarily an indication of its future performance. Updated performance information is available on the Fund’s Web site at www.invesco.com/us.

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.04%

Best Quarter (ended March 31, 2001): 1.41%

Worst Quarter (ended March 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (1/17/1996)		0.11	%		2.69	%		2.46	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and the Fund’s distributor or its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson or financial adviser to recommend the Fund over another investment. Ask your salesperson or financial adviser or visit your financial intermediary’s Web site for more information.

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

2 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.29

Fee Waiver and/or Expense Reimbursement ²		0.07

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.22


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.22% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	23	$	86	$	156	$	361

Principal Investment Strategies of the Fund

The Fund invests in high-quality U.S. dollar denominated obligations with maturities of 60 days or less, including: (i) securities issued by the U.S. Government or its agencies; (ii) bankers’ acceptances, certificates of deposit, and time deposits from U.S. or foreign banks; (iii) repurchase agreements; (iv) commercial paper; (v) municipal securities; and (vi) master notes.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may purchase delayed delivery and when-issued securities that have a maturity of up to 60 days, calculated from settlement date. The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries, which may be affected by the following factors: the supply of short-term financing; changes in government regulation and interest rates; and overall economy.

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

actions to maintain the Fund’s $1.00 share price. The credit quality of the Fund’s holdings can change rapidly in certain markets, and the default of a single holding could have an adverse impact on the Fund’s share price. The Fund’s share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. Further regulation could impact the way the Fund is managed, possibly negatively impacting its return. Additionally, the Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities.

Performance Information

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.39%

Worst Quarter (ended September 30, 2009, December 31, 2009 and March 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (6/30/1994)		0.07	%		2.57	%		2.37	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.28

Fee Waiver and/or Expense Reimbursement ²		0.06

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.22


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.22% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	23	$	84	$	151	$	350

Principal Investment Strategies of the Fund

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in direct obligations of the U.S. Treasury including bills, notes and bonds, and repurchase agreements secured by those obligations. At the present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury, including bills, notes and bonds, and repurchase agreements secured by those obligations.

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

5 Short-Term Investment Trust

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.36%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (8/18/1993)		0.02	%		2.25	%		2.19	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.23

Fee Waiver and/or Expense Reimbursement ²		0.02

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.21


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.22% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	22	$	72	$	127	$	291

Principal Investment Strategies of the Fund

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in direct obligations of the U.S. Treasury and other securities issued or guaranteed as to principal and interest by the U.S. Government or its agencies and instrumentalities (Agency Securities), as well as repurchase agreements secured by those obligations. Agency Securities may be supported by (i) the full faith and credit of the U.S. Treasury; (ii) the right of the issuer to borrow from the U.S. Treasury; (iii) the discretionary authority of the U.S. Government to purchase certain obligations of the agency or instrumentality; or (iv) the credit of the agency or instrumentality. At the present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury and Agency Securities, as well as repurchase agreements secured by those obligations.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

6 Short-Term Investment Trust

exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.39%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (9/1/1998)		0.02	%		2.46	%		2.32	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

7 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.08

Total Annual Fund Operating Expenses		0.36

Fee Waiver and/or Expense Reimbursement ²		0.14

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.22


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.22% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	23	$	102	$	188	$	442

Principal Investment Strategies of the Fund

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in direct obligations of the U.S. Treasury, which include Treasury bills, notes and bonds, and in securities issued or guaranteed as to principal and interest by the U.S. Government or by its agencies or instrumentalities (Agency Securities). Agency Securities may be supported by (i) the full faith and credit of the U.S. Treasury; (ii) the right of the issuer to borrow from the U.S. Treasury; (iii) the discretionary authority of the U.S. Government to purchase certain obligations of the agency or instrumentality; or (iv) the credit of the agency or instrumentality. At the present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury and Agency Securities.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

8 Short-Term Investment Trust

Performance Information

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.35%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (12/30/1999)		0.02	%		2.37	%		2.24	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Cash Management

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Cash Management

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees ¹		0.10

Other Expenses		0.06

Total Annual Fund Operating Expenses		0.39

Fee Waiver and/or Expense Reimbursement ²		0.06

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.33


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.02% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Cash Management Class shares to 0.33% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Cash Management Class	$	34	$	119	$	213	$	487

Principal Investment Strategies of the Fund

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in debt securities, the interest of which is excluded from gross income for federal income tax purposes and does not constitute an item of preference for purposes of the alternative minimum tax.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund invests primarily in high quality U.S. dollar-denominated short-term debt obligations, including: (i) municipal securities; (ii) tax-exempt commercial paper; and (iii) cash equivalents. These securities may have credit and liquidity enhancements provided by banks, insurance companies or other financial institutions. Municipal securities include debt obligations of states, territories and possessions of the United States and the District of Columbia, their political subdivisions, agencies and instrumentalities, authorities thereof, and multi-state agencies, issued to obtain funds for various public purposes. Municipal lease obligations, synthetic municipal securities and certain types of industrial revenue bonds are treated as municipal securities. Synthetic municipal securities, which

9 Short-Term Investment Trust

include variable rate instruments that are created when fixed rate bonds are coupled with a third party demand feature, are treated as municipal securities. Other securities held by the Fund may be structured with demand features which have the effect of shortening the security’s maturity.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

10 Short-Term Investment Trust

Annual Total Returns

Cash Management Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.87%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Cash Management Class: Inception (1/4/1999)		0.02	%		1.75	%		1.64	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Cash Management Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions primarily are exempt from regular federal income tax. A portion of these distributions, however, may be subject to the federal alternative minimum tax and state and local taxes. The Fund may also make distributions that are taxable to you as ordinary income.

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity. The Fund’s investment objective may be changed by the Board of Trustees without shareholder approval.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s Statement of Additional Information (SAI) and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

The Fund’s investments in the types of securities described in this prospectus vary from time to time, and, at any time, the Fund may not be invested in all of the types of securities described in this prospectus. Any percentage limitations with respect to assets of the Fund are applied at the time of purchase.

Risks

The principal risks of investing in the Fund are:

Credit Risk . The issuers of instruments in which the Fund invests may be unable to meet interest and/or principal payments. An issuer’s securities may decrease in value if its financial strength weakens, which may reduce its credit rating and possibly its ability to meet its contractual obligations.

Foreign Credit Exposure Risk . U.S. dollar denominated securities carrying foreign credit exposure may be affected by unfavorable political,

11 Short-Term Investment Trust

economic or governmental developments that could affect payments of principal and interest.

Foreign Securities Risk . The value of the Fund’s foreign investments may be adversely affected political and social instability in their home countries, by changes in economic or taxation policies in those countries, or by the difficulty in enforcing obligations in those countries. Foreign companies generally may be subject to less stringent regulations than U.S. companies, including financial reporting requirements and auditing and accounting controls. As a result, there generally is less publicly available information about foreign companies than about U.S. companies. Trading in many foreign securities may be less liquid and more volatile than U.S. securities due to the size of the market or other factors.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Interest Rate Risk . Interest rate risk refers to the risk that bond prices generally fall as interest rates rise; conversely, bond prices generally rise as interest rates fall. Specific bonds differ in their sensitivity to changes in interest rates depending on their individual characteristics. One measure of this sensitivity is called duration. The longer the duration of a particular bond, the greater its price sensitivity is to interest rates. Similarly, a longer duration portfolio of securities has greater price sensitivity. Falling interest rates may also prompt some issuers to refinance existing debt, which could affect the Fund’s performance.

Liquidity Risk . A security is considered to be illiquid if the Fund is unable to sell such security at a fair price within a reasonable amount of time. A security may be deemed illiquid due to a lack of trading volume in the security or if the security is privately placed and not traded in any public market or is otherwise restricted from trading. The Fund may be unable to sell illiquid securities at the time or price it desires and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Municipal Securities Risk . The Fund may invest in municipal securities. Constitutional amendments, legislative enactments, executive orders, administrative regulations, voter initiatives, and the issuer’s regional economic conditions may affect the municipal security’s value, interest payments, repayment of principal and the Fund’s ability to sell it. Revenue bonds are generally not backed by the taxing power of the issuing municipality. To the extent that a municipal security is not heavily followed by the investment community or such security issue is relatively small, the security may be difficult to value or sell at a desirable price. If the Internal Revenue Service (IRS) determines that an issuer of a municipal security has not complied with applicable tax requirements, interest from the security could be treated as taxable, which could result in a decline in the security’s value. In addition, there could be changes in applicable tax laws or tax treatments that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise adversely affect the current federal or state tax status of municipal securities.

Repurchase Agreement Risk . If the seller of a repurchase agreement in which the Fund invests defaults on its obligation or declares bankruptcy, the Fund may experience delays in selling the securities underlying the repurchase agreement. As a result, the Fund may incur losses arising from decline in the value of those securities, reduced levels of income and expenses of enforcing its rights.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Foreign Credit Exposure Risk . U.S. dollar denominated securities carrying foreign credit exposure may be affected by unfavorable political, economic or governmental developments that could affect payments of principal and interest.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

13 Short-Term Investment Trust

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states. Shares of the Fund are intended to qualify as eligible investments for federally chartered credit unions pursuant to Section 107(7), 107(8) and 107(15) of the Federal Credit Union Act, Part 703 of the National Credit Union Administration (NCUA) Rules and Regulations and NCUA Letter Number 155.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or

15 Short-Term Investment Trust

other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity. The Fund’s investment objective may be changed by the Board of Trustees without shareholder approval.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Credit Risk . The issuers of instruments in which the Fund invests may be unable to meet interest and/or principal payments. An issuer’s

16 Short-Term Investment Trust

securities may decrease in value if its financial strength weakens, which may reduce its credit rating and possibly its ability to meet its contractual obligations.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Invesco Advisers, Inc. (Invesco or the Adviser) serves as each Fund’s investment adviser. The Adviser manages the investment operations of each Fund as well as other investment portfolios that encompass a broad range of investment objectives, and has agreed to perform or arrange for the performance of each Fund’s day-to-day management. The Adviser is located at 1555 Peachtree Street, N.E., Atlanta, Georgia 30309. The Adviser, as successor in interest to multiple investment advisers, has been an investment adviser since 1976.

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.01% of Government TaxAdvantage Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

will not change the price paid by investors for the purchase of the Funds’ shares or the amount that a Fund will receive as proceeds from such sales. In certain cases these cash payments could be significant to the financial intermediaries. These cash payments may also create an incentive for a financial intermediary to recommend or sell shares of the Funds to its customers. Please contact your financial intermediary for details about any payments they or their firm may receive in connection with the sale of shares of the Funds or the provision of services to the Funds. Also, please see the Funds’ SAI for more information of these types of payments.

A discussion regarding the basis for the Board of Trustees’ approval of the investment advisory agreement and investment sub-advisory agreements of each Fund is available in each Fund’s most recent annual report to shareholders for the twelve-month period ended August 31.

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Dividends are paid on settled shares of the Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio as of 5:30 p.m. Eastern Time, of the STIC Prime Portfolio as of 4:30 p.m. Eastern Time, and of the Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio as of 3:30 p.m. Eastern Time (“Settlement Time”). If a Fund closes early on a business day, such Fund will pay dividends on settled shares at such earlier closing time. Generally, shareholders whose purchase orders have been accepted by the Funds prior to the respective Fund’s Settlement Time, or an earlier close time on any day that a Fund closes early, and shareholders whose redemption proceeds have not been wired to them on any business day are eligible to receive dividends on that business day. The dividend declared on any day preceding a non-business day or days of a Fund will include the net income accrued on such non-business day or days. Dividends and distributions are reinvested in the form of additional full and fractional shares at net asset value unless the shareholder has elected to have such dividends and distributions paid in cash. See “Pricing of Shares – Timing of Orders” for a description of the Fund’s business days.

Capital Gains Distributions

Liquid Assets Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

STIC Prime Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

Treasury Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

Government & Agency Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

Government TaxAdvantage Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

Tax-Free Cash Reserve Portfolio generally distributes net realized capital gains (including net short-term capital gains), if any, at least annually. The Fund does not expect to realize any long-term capital gains and losses.

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Cash Management Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

This information has been audited by PricewaterhouseCoopers LLP, whose report, along with each Fund’s financial statements, is included in each Fund’s annual report, which is available upon request.

Cash Management Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.08	%	$	1,567,468		0.21	% ^(c)		0.27	% ^(c)		0.08	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.11			2,627,363		0.22			0.28			0.12
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		1.22			3,194,408		0.24			0.31			1.09
Year ended 08/31/08		1.00		0.04	^(b)		0.00			0.04		(0.04	)		(0.00	)		(0.04	)		1.00		3.72			2,998,653		0.20			0.27			3.56
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.29			3,397,869		0.20			0.28			5.17

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.04			451,634		0.20	^(c)		0.29	^(c)		0.04	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.07			451,404		0.21			0.29			0.08
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.81			914,099		0.25			0.33			0.85
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.55			1,586,211		0.20			0.28			3.38
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		5.30			2,146,528		0.20			0.29			5.17

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			6,379,706		0.12	^(c)		0.28	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			5,279,601		0.15			0.28			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.31			11,498,817		0.22			0.30			0.30
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		2.85			7,556,878		0.20			0.28			2.58
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.08			2,833,734		0.20			0.29			4.95

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			1,674,548		0.14	^(c)		0.23	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			1,042,886		0.20			0.23			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.65			1,924,916		0.22			0.25			0.52
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.34			1,028,040		0.20			0.24			3.20
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.22			730,316		0.20			0.25			5.10

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			39,369		0.11	^(c)		0.36	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			9,810		0.14			0.36			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.51			25,731		0.22			0.40			0.44
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.19			29,100		0.20			0.34			3.22
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.12			93,310		0.20			0.40			5.00

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.02			106,336		0.26	^(c)		0.39	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			128,256		0.29			0.39			0.03
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.83			360,427		0.35			0.41			0.96
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.69			895,899		0.30	^(d)		0.35	^(d)		1.68	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		3.19			789,753		0.30			0.35			3.15
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		3.33			721,351		0.30			0.35			3.28


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $2,214,082, $486,337, $5,419,142, $1,210,302, $19,183 and $132,403 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investment Trust

In connection with the final settlement reached between Invesco and certain of its affiliates with certain regulators, including the New York Attorney General’s Office, the SEC and the Colorado Attorney General’s Office (the settlement) arising out of certain market timing and unfair pricing allegations made against Invesco and certain of its affiliates, Invesco and certain of its affiliates agreed, among other things, to disclose certain hypothetical information regarding investment and expense information to Fund shareholders. The chart below is intended to reflect the annual and cumulative impact of the Fund’s expenses, including investment advisory fees and other Fund costs, on the Fund’s returns over a 10-year period. The example reflects the following:


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.

There is no assurance that the annual expense ratio will be the expense ratio for the Fund classes for any of the years shown. This is only a hypothetical presentation made to illustrate what expenses and returns would be under the above scenarios; your actual returns and expenses are likely to differ (higher or lower) from those shown below.



Liquid Assets Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.22%		0	.27%		0	.27%		0	.27%		0	.27%		0	.27%		0	.27%		0	.27%		0	.27%		0	.27%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.78%		9	.74%		14	.93%		20	.36%		26	.06%		32	.02%		38	.26%		44	.80%		51	.65%		58	.82%
End of Year Balance	$	10,478	.00	$	10,973	.61	$	11,492	.66	$	12,036	.26	$	12,605	.58	$	13,201	.82	$	13,826	.27	$	14,480	.25	$	15,165	.17	$	15,882	.48
Estimated Annual Expenses	$	22	.53	$	28	.96	$	30	.33	$	31	.76	$	33	.27	$	34	.84	$	36	.49	$	38	.21	$	40	.02	$	41	.91

STIC Prime Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.22%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.78%		9	.72%		14	.88%		20	.29%		25	.96%		31	.89%		38	.10%		44	.61%		51	.42%		58	.55%
End of Year Balance	$	10,478	.00	$	10,971	.51	$	11,488	.27	$	12,029	.37	$	12,595	.95	$	13,189	.22	$	13,810	.43	$	14,460	.91	$	15,142	.01	$	15,855	.20
Estimated Annual Expenses	$	22	.53	$	31	.10	$	32	.57	$	34	.10	$	35	.71	$	37	.39	$	39	.15	$	40	.99	$	42	.92	$	44	.95

Treasury Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.22%		0	.28%		0	.28%		0	.28%		0	.28%		0	.28%		0	.28%		0	.28%		0	.28%		0	.28%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.78%		9	.73%		14	.90%		20	.33%		26	.01%		31	.96%		38	.18%		44	.71%		51	.54%		58	.69%
End of Year Balance	$	10,478	.00	$	10,972	.56	$	11,490	.47	$	12,032	.82	$	12,600	.77	$	13,195	.52	$	13,818	.35	$	14,470	.58	$	15,153	.59	$	15,868	.84
Estimated Annual Expenses	$	22	.53	$	30	.03	$	31	.45	$	32	.93	$	34	.49	$	36	.11	$	37	.82	$	39	.60	$	41	.47	$	43	.43

Government & Agency Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.21%		0	.23%		0	.23%		0	.23%		0	.23%		0	.23%		0	.23%		0	.23%		0	.23%		0	.23%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.79%		9	.79%		15	.03%		20	.51%		26	.26%		32	.28%		38	.59%		45	.20%		52	.13%		59	.39%
End of Year Balance	$	10,479	.00	$	10,978	.85	$	11,502	.54	$	12,051	.21	$	12,626	.05	$	13,228	.32	$	13,859	.31	$	14,520	.40	$	15,213	.02	$	15,938	.68
Estimated Annual Expenses	$	21	.50	$	24	.68	$	25	.85	$	27	.09	$	28	.38	$	29	.73	$	31	.15	$	32	.64	$	34	.19	$	35	.82

Government TaxAdvantage Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.22%		0	.36%		0	.36%		0	.36%		0	.36%		0	.36%		0	.36%		0	.36%		0	.36%		0	.36%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.78%		9	.64%		14	.73%		20	.05%		25	.62%		31	.45%		37	.55%		43	.93%		50	.61%		57	.60%
End of Year Balance	$	10,478	.00	$	10,964	.18	$	11,472	.92	$	12,005	.26	$	12,562	.30	$	13,145	.20	$	13,755	.13	$	14,393	.37	$	15,061	.22	$	15,760	.06
Estimated Annual Expenses	$	22	.53	$	38	.60	$	40	.39	$	42	.26	$	44	.22	$	46	.27	$	48	.42	$	50	.67	$	53	.02	$	55	.48

Tax-Free Cash Reserve Portfolio — CASH MANAGEMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.33%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.67%		9	.50%		14	.54%		19	.82%		25	.35%		31	.13%		37	.17%		43	.49%		50	.11%		57	.03%
End of Year Balance	$	10,467	.00	$	10,949	.53	$	11,454	.30	$	11,982	.35	$	12,534	.73	$	13,112	.58	$	13,717	.07	$	14,349	.43	$	15,010	.94	$	15,702	.94
Estimated Annual Expenses	$	33	.77	$	41	.76	$	43	.69	$	45	.70	$	47	.81	$	50	.01	$	52	.32	$	54	.73	$	57	.25	$	59	.89


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investment Trust

Each Fund consists of seven classes of shares that share a common investment objective and portfolio of investments. The seven classes differ only with respect to distribution arrangements and any applicable associated Rule 12b-1 fees and expenses.

Distribution and Service (12b-1) Fees

Each Fund has adopted a 12b-1 plan with respect to each class other than the Institutional Class that allows each Fund to pay distribution and service fees to Invesco Distributors, Inc. (the distributor) for the sale and distribution of its shares and fees for services provided to investors. Because each Fund pays these fees out of its assets on an ongoing basis, over time these fees will increase the cost of your investment and may cost you more than paying other types of sales charges.

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Cash Management Class accounts are as follows:



	Initial		Additional
Class	Investments*		Investments

Cash Management Class	$	1 million		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 5:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 5:30 p.m. Eastern Time on a business day. If you wish to place an order between 5:00 p.m. and 5:30 p.m. Eastern Time on a business day, you must place such order by telephone; however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If a Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Funds verify and record your identifying information.

STIC Prime Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 4:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 4:30 p.m. Eastern Time on a business day. If you wish to place an order between 4:00 p.m. and 4:30 p.m. Eastern Time on a business day, you must place such order by telephone; however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.

Government TaxAdvantage Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.

A-1 The Invesco Funds

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

All of your dividends and distributions may be paid in cash or invested in the same Fund at net asset value. Unless you specify otherwise, your dividends and distributions will automatically be reinvested in the same Fund in the form of full and fractional shares at net asset value.

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

We will normally wire payment for redemptions received prior to 5:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 5:30 p.m. Eastern Time, the redemption will be effected at the net asset value of each Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If a Fund exercises its discretion to close early on a business day, as described in the “Pricing of Shares—Timing of Orders” section of this prospectus, a Fund may not provide same day settlement of redemption orders.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid by wire transfer on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

A-2 The Invesco Funds

STIC Prime Portfolio

We will normally wire payment for redemptions received prior to 4:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 4:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If the Fund exercises its discretion to close early on a business day, as described in the “Pricing of Shares—Timing of Orders” section of this prospectus, the Fund may not provide same day settlement of redemption orders.

Government TaxAdvantage Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

If you redeem by telephone, we will transmit the amount of the redemption proceeds electronically to your pre-authorized bank account. We use reasonable procedures to confirm that instructions communicated by telephone are genuine and are not liable for telephone instructions that are reasonably believed to be genuine.

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

If a Fund determines that you have not provided a correct Social Security or other tax ID number on your account application, or a Fund is not able to verify your identity as required by law, a Fund may, at its discretion, redeem the account and distribute the proceeds to you.

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee that their net asset value will always remain at $1.00 per share.

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

The Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to enable the Fund to price its shares at $1.00 per share. The Fund cannot guarantee that its net asset value will always remain at $1.00 per share.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to

A-3 The Invesco Funds

enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund opens for business at 8:30 a.m. Eastern Time. Each Fund prices purchase and redemption orders on each business day at the net asset value calculated after the transfer agent receives an order in good form.

A business day is any day that the Federal Reserve Bank of New York and The Bank of New York Mellon, the Funds’ custodian, are open for business. Each fund is authorized not to open for trading on a day that is otherwise a business day if the Securities Industry and Financial Markets Association (SIFMA) recommends that government securities dealers not open for trading; any such day will not be considered a business day. Each Fund also may close early on a business day if the SIFMA recommends that government securities dealers close early.

If the financial intermediary through which you place purchase and redemption orders places its orders to the transfer agent through the NSCC, the transfer agent may not receive those orders until the next business day after the order has been entered into the NSCC.

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Thirty-minutes prior to the Funds’ net asset value determination, Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, and Government TaxAdvantage Portfolio may, in their discretion, limit or refuse to accept purchase orders and may not provide same-day payment of redemption proceeds.

During the period between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, Tax-Free Cash Reserve Portfolio may, in its discretion, refuse to accept purchase orders and may not provide same-day settlement of redemption orders. On days that the Fund closes early, the fund may, in its discretion, refuse to accept purchase orders and may not provide same day settlement of redemption orders for such purchases and redemption orders received by the transfer agent (i) if the Fund closes after 12:30 p.m. Eastern Time, between 12:30 p.m. Eastern Time and the time the Fund closes, and (ii) if the Fund closes on or before 12:30 p.m. Eastern Time, during the thirty minute period prior to the Fund’s net asset value determination.

Frequent Purchases and Redemptions of Fund Shares

The Board of the Funds has not adopted any policies and procedures that would limit frequent purchases and redemptions of the Funds’ shares. The Board does not believe that it is appropriate to adopt any such policies and procedures for the following reasons:


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.
n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

The Board considered the risks of not having a specific policy that limits frequent purchases and redemptions, and it determined that those risks are minimal, especially in light of the reasons for not having such a policy as described above. Nonetheless, to the extent that each Fund must maintain additional cash and/or securities with shorter-term durations than may otherwise be required, the Fund’s yield could be negatively impacted.

Each Fund and its agent reserves the right at any time to reject or cancel any part of any purchase order. This could occur if each Fund determines that such purchase may disrupt the Fund’s operation or performance.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

A Fund intends to qualify each year as a regulated investment company and, as such, is not subject to entity-level tax on the income and gain it distributes to shareholders. If you are a taxable investor, dividends and distributions you receive from a Fund generally are taxable to you whether you reinvest distributions in additional Fund shares or take them in cash. Every year, you will be sent information showing the amount of dividends and distributions you received from a Fund during the prior calendar year. In addition, investors in taxable accounts should be aware of the following basic tax points as supplemented below where relevant:


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.

By law, if you do not provide a Fund with your proper taxpayer identification number and certain required certifications, you may be subject to backup withholding on any distributions of income, capital gains, or proceeds from the sale of your shares. A Fund also must withhold if the IRS instructs it to do so. When withholding is required, the amount will be 28% of any distributions or proceeds paid.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

A-4 The Invesco Funds

Tax-Free Cash Reserve Portfolio

You will not be required to include the “exempt-interest” portion of dividends paid by the Fund in your gross income for federal income tax purposes. You will be required to report the receipt of exempt-interest dividends and other tax-exempt interest on your federal income tax returns. The percentage of dividends that constitutes exempt-interest dividends will be determined annually. This percentage may differ from the actual percentage of exempt interest received by the Fund for the particular days in which you hold shares.


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

There are risks that: (a) a security issued as tax-exempt may be reclassified by the Internal Revenue Service or a state tax authority as taxable and/or (b) future legislative, administrative or court actions could adversely impact the qualification of income from a tax-exempt security as tax-free. Such reclassifications or actions could cause interest from a security to become taxable, possibly retroactively, subjecting you to increased tax liability. In addition, such reclassifications or actions could cause the value of a security, and therefore, the value of the Fund’s shares, to decline.

The above discussion concerning the taxability of Fund dividends and distributions and of redemptions and exchanges of Fund shares is inapplicable to investors that generally are exempt from federal income tax, such as retirement plans that are qualified under Section 401 and 403 of the Code and individual retirement accounts (IRAs) and Roth IRAs.

This discussion of “Taxes” is for general information only and not tax advice. All investors should consult their own tax advisers as to the federal, state, local and foreign tax provisions applicable to them.

Important Notice Regarding Delivery of Security Holder Documents

To reduce Fund expenses, only one copy of most shareholder documents may be mailed to shareholders with multiple accounts at the same address (Householding). Mailing of your shareholder documents may be householded indefinitely unless you instruct us otherwise. If you do not want the mailing of these documents to be combined with those for other members of your household, please contact Invesco Investment Services, Inc. at 800-959-4246 or contact your financial institution. We will begin sending you individual copies for each account within thirty days after receiving your request.

A-5 The Invesco Funds

More information may be obtained free of charge upon request. The SAI, a current version of which is on file with the SEC, contains more details about each Fund and is incorporated by reference into this prospectus (is legally a part of this prospectus). Annual and semi-annual reports to shareholders contain additional information about each Fund’s investments. Each Fund’s annual report also discusses the market conditions and investment strategies that significantly affected each Fund’s performance during its last fiscal year. Each Fund also files its complete schedule of portfolio holdings with the SEC for the 1st and 3rd quarters of each fiscal year on Form N-Q.

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us

You can also review and obtain copies of each Fund’s SAI, annual or semi-annual reports, Forms N-Q and other information at the SEC’s Public Reference Room in Washington, DC; on the EDGAR database on the SEC’s Web site (http://www.sec.gov); or, after paying a duplicating fee, by sending a letter to the SEC’s Public Reference Section, Washington, DC 20549-1520 or by sending an electronic mail request to publicinfo@sec.gov. Please call the SEC at 1-202-551-8090 for information about the Public Reference Room.





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-3


Prospectus	December 16, 2011







Liquid Assets Portfolio (LPCXX)

STIC Prime Portfolio (SSCXX)

Treasury Portfolio (TYCXX)

Government & Agency Portfolio (AGCXX)

Government TaxAdvantage Portfolio (TACXX)

Tax-Free Cash Reserve Portfolio (TFOXX)

Corporate Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		2
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		7
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Distribution and Service (12b-1) Fees		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.20

Fee Waiver and/or Expense Reimbursement ¹		0.03

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.17


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.17%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	17	$	61	$	110	$	252

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

1 Short-Term Investment Trust

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.07%

Best Quarter (ended September 30, 2006, December 31, 2006 and September 30, 2007): 1.32%

Worst Quarter (ended March 31, 2010): 0.03%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Corporate Class: Inception (3/29/2005)		0.16	%		2.75	%		2.84	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

2 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.22

Fee Waiver and/or Expense Reimbursement ¹		0.05

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.17


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.17%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	17	$	66	$	119	$	275

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

The Fund’s share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. Further regulation could impact the way the Fund is managed, possibly negatively impacting its return. Additionally, the Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities.

Performance Information

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.04%

Best Quarter (ended September 30, 2006, December 31, 2006 and September 30, 2007): 1.32%

Worst Quarter (ended March 31, 2010): 0.02%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Corporate Class: Inception (3/31/2005)		0.12	%		2.62	%		2.73	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.21

Fee Waiver and/or Expense Reimbursement ¹		0.04

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.17


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.17%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	17	$	64	$	114	$	264

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended December 31, 2006): 1.29%

Worst Quarter (ended March 31, 2010): 0.00%

5 Short-Term Investment Trust



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Corporate Class: Inception (8/1/2005)		0.03	%		2.29	%		2.39	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.03

Total Annual Fund Operating Expenses ¹		0.16


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.17%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	16	$	52	$	90	$	205

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

6 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended December 31, 2006): 1.31%

Worst Quarter (ended March 31, 2010 and December 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Corporate Class: Inception (6/30/2005)		0.06	%		2.51	%		2.61	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

7 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.08

Total Annual Fund Operating Expenses		0.29

Fee Waiver and/or Expense Reimbursement ¹		0.12

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.17


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.17%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	17	$	81	$	151	$	356

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

8 Short-Term Investment Trust

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007): 1.27%

Worst Quarter (ended December 31, 2009, March 31, 2010, June 30, 2010, September 30, 2010 and December 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			Since
	Year			Inception

Corporate Class: Inception (2/23/2006)		0.02	%		2.35	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Corporate

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Corporate

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees		0.03

Other Expenses		0.06

Total Annual Fund Operating Expenses		0.32

Fee Waiver and/or Expense Reimbursement ¹		0.04

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.28


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Corporate Class shares to 0.28%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Corporate Class	$	29	$	99	$	176	$	402

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio

9 Short-Term Investment Trust

securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

10 Short-Term Investment Trust

Annual Total Returns

Corporate Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.88%

Worst Quarter (ended March 31, 2010, June 30, 2010, September 30, 2010 and December 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Corporate Class: Inception (9/8/2005)		0.04	%		1.79	%		1.84	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Corporate Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Risks

The principal risks of investing in the Fund are:

Foreign Credit Exposure Risk . U.S. dollar denominated securities carrying foreign credit exposure may be affected by unfavorable political,

11 Short-Term Investment Trust

economic or governmental developments that could affect payments of principal and interest.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

13 Short-Term Investment Trust

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or

15 Short-Term Investment Trust

other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Credit Risk . The issuers of instruments in which the Fund invests may be unable to meet interest and/or principal payments. An issuer’s

16 Short-Term Investment Trust

securities may decrease in value if its financial strength weakens, which may reduce its credit rating and possibly its ability to meet its contractual obligations.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Corporate Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Corporate Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.12	%	$	1,858,584		0.17	% ^(c)		0.20	% ^(c)		0.12	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.16			3,675,221		0.17			0.21			0.17
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		1.27			6,080,137		0.19			0.24			1.14
Year ended 08/31/08		1.00		0.04	^(b)		0.00			0.04		(0.04	)		(0.00	)		(0.04	)		1.00		3.77			2,491,241		0.15			0.20			3.61
Year ended 08/31/07		1.00		0.05			(0.00	)		0.05		(0.05	)		—			(0.05	)		1.00		5.34			636,222		0.15			0.21			5.22

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.08			102,632		0.16	^(c)		0.22	^(c)		0.08	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.11			271,611		0.17			0.22			0.12
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.86			133,882		0.20			0.26			0.90
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.60			389,172		0.15			0.21			3.43
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		5.35			616,436		0.15			0.22			5.22

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			1,856,324		0.11	^(c)		0.21	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			1,553,767		0.15			0.21			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.36			2,039,501		0.18			0.23			0.34
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		2.90			859,460		0.15			0.21			2.63
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.14			448,144		0.15			0.22			5.00

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			1,344,281		0.13	^(c)		0.16	^(c)		0.04	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.08			1,170,076		0.16			0.16			0.08
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.70			1,798,303		0.17			0.18			0.57
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.39			27,199		0.15			0.17			3.25
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.28			317,772		0.15			0.18			5.15

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			50,842		0.10	^(c)		0.29	^(c)		0.04	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			6,010		0.15			0.29			0.03
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.56			15		0.18			0.33			0.48
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.24			14		0.15			0.27			3.27
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.18			14		0.15			0.33			5.05

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.04			27,954		0.24	^(c)		0.32	^(c)		0.05	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.05			713		0.27			0.32			0.05
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.88			46,528		0.30			0.34			1.01
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.71			42,829		0.25	^(d)		0.28	^(d)		1.73	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		3.24			146,677		0.25			0.28			3.20
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		3.38			160,208		0.25			0.28			3.33


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $2,233,758, $176,359, $2,016,777, $1,058,730, $2,974 and $14,079 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investments Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.17%		0	.20%		0	.20%		0	.20%		0	.20%		0	.20%		0	.20%		0	.20%		0	.20%		0	.20%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.83%		9	.86%		15	.14%		20	.66%		26	.45%		32	.52%		38	.88%		45	.55%		52	.54%		59	.86%
End of Year Balance	$	10,483	.00	$	10,986	.18	$	11,513	.52	$	12,066	.17	$	12,645	.35	$	13,252	.32	$	13,888	.43	$	14,555	.08	$	15,253	.72	$	15,985	.90
Estimated Annual Expenses	$	17	.41	$	21	.47	$	22	.50	$	23	.58	$	24	.71	$	25	.90	$	27	.14	$	28	.44	$	29	.81	$	31	.24

STIC Prime Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.17%		0	.22%		0	.22%		0	.22%		0	.22%		0	.22%		0	.22%		0	.22%		0	.22%		0	.22%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.83%		9	.84%		15	.09%		20	.59%		26	.36%		32	.40%		38	.73%		45	.36%		52	.30%		59	.58%
End of Year Balance	$	10,483	.00	$	10,984	.09	$	11,509	.13	$	12,059	.26	$	12,635	.70	$	13,239	.68	$	13,872	.54	$	14,535	.65	$	15,230	.45	$	15,958	.47
Estimated Annual Expenses	$	17	.41	$	23	.61	$	24	.74	$	25	.93	$	27	.16	$	28	.46	$	29	.82	$	31	.25	$	32	.74	$	34	.31

Treasury Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.17%		0	.21%		0	.21%		0	.21%		0	.21%		0	.21%		0	.21%		0	.21%		0	.21%		0	.21%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.83%		9	.85%		15	.11%		20	.63%		26	.41%		32	.46%		38	.80%		45	.45%		52	.42%		59	.72%
End of Year Balance	$	10,483	.00	$	10,985	.14	$	11,511	.32	$	12,062	.72	$	12,640	.52	$	13,246	.00	$	13,880	.48	$	14,545	.36	$	15,242	.08	$	15,972	.18
Estimated Annual Expenses	$	17	.41	$	22	.54	$	23	.62	$	24	.75	$	25	.94	$	27	.18	$	28	.48	$	29	.85	$	31	.28	$	32	.77

Government & Agency Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%		0	.16%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.84%		9	.91%		15	.23%		20	.81%		26	.66%		32	.79%		39	.22%		45	.95%		53	.02%		60	.42%
End of Year Balance	$	10,484	.00	$	10,991	.43	$	11,523	.41	$	12,081	.14	$	12,665	.87	$	13,278	.90	$	13,921	.60	$	14,595	.40	$	15,301	.82	$	16,042	.43
Estimated Annual Expenses	$	16	.39	$	17	.18	$	18	.01	$	18	.88	$	19	.80	$	20	.76	$	21	.76	$	22	.81	$	23	.92	$	25	.08

Government TaxAdvantage Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.17%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.83%		9	.77%		14	.94%		20	.35%		26	.02%		31	.96%		38	.17%		44	.68%		51	.49%		58	.63%
End of Year Balance	$	10,483	.00	$	10,976	.75	$	11,493	.75	$	12,035	.11	$	12,601	.96	$	13,195	.52	$	13,817	.02	$	14,467	.81	$	15,149	.24	$	15,862	.77
Estimated Annual Expenses	$	17	.41	$	31	.12	$	32	.58	$	34	.12	$	35	.72	$	37	.41	$	39	.17	$	41	.01	$	42	.94	$	44	.97

Tax-Free Cash Reserve Portfolio — CORPORATE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.28%		0	.32%		0	.32%		0	.32%		0	.32%		0	.32%		0	.32%		0	.32%		0	.32%		0	.32%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.72%		9	.62%		14	.75%		20	.12%		25	.74%		31	.63%		37	.79%		44	.24%		50	.99%		58	.05%
End of Year Balance	$	10,472	.00	$	10,962	.09	$	11,475	.12	$	12,012	.15	$	12,574	.32	$	13,162	.80	$	13,778	.82	$	14,423	.67	$	15,098	.69	$	15,805	.31
Estimated Annual Expenses	$	28	.66	$	34	.29	$	35	.90	$	37	.58	$	39	.34	$	41	.18	$	43	.11	$	45	.12	$	47	.24	$	49	.45


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investments Trust

Distribution and Service (12b-1) Fees

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Corporate Class accounts are as follows:



	Initial		Additional
Class	Investments*		Investments

Corporate Class	$	1 million		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.

A-1 The Invesco Funds

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

A-2 The Invesco Funds

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to

A-3 The Invesco Funds

enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.
n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

A-4 The Invesco Funds

Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

A-5 The Invesco Funds

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-2


Prospectus	December 16, 2011







Liquid Assets Portfolio (LAPXX)

STIC Prime Portfolio (SRIXX)

Treasury Portfolio (TRPXX)

Government & Agency Portfolio (AGPXX)

Government TaxAdvantage Portfolio (TSPXX)

Tax-Free Cash Reserve Portfolio (TFPXX)

Institutional Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		2
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		7
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.17

Fee Waiver and/or Expense Reimbursement ¹		0.03

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.14


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.14%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	14	$	52	$	93	$	214

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

1 Short-Term Investment Trust

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.09%

Best Quarter (ended March 31, 2001): 1.43%

Worst Quarter (ended March 31, 2010): 0.03%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (11/4/1993)		0.19	%		2.78	%		2.55	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

2 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.19

Fee Waiver and/or Expense Reimbursement ¹		0.05

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.14


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.14%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	14	$	56	$	102	$	238

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

Performance Information

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.06%

Best Quarter (ended March 31, 2001): 1.41%

Worst Quarter (ended March 31, 2010): 0.02%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (11/10/1980)		0.15	%		2.65	%		2.46	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.18

Fee Waiver and/or Expense Reimbursement ¹		0.04

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.14


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.14%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	14	$	54	$	97	$	226

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.38%

Worst Quarter (ended December 31, 2009, March 31, 2010, June 30, 2010 and December 31, 2010): 0.01%

5 Short-Term Investment Trust



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (4/12/1984)		0.05	%		2.31	%		2.26	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.03

Total Annual Fund Operating Expenses ¹		0.13


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.14%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	13	$	42	$	73	$	166

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

6 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.03%

Best Quarter (ended March 31, 2001): 1.41%

Worst Quarter (ended March 31, 2010, June 30, 2010 and December 31, 2010): 0.02%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (9/1/1998)		0.09	%		2.54	%		2.40	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

7 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.08

Total Annual Fund Operating Expenses		0.26

Fee Waiver and/or Expense Reimbursement ¹		0.12

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.14


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.14%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	14	$	71	$	134	$	319

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

8 Short-Term Investment Trust

performance is not necessarily an indication of its future performance. Updated performance information is available on the Fund’s Web site at www.invesco.com/us.

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.37%

Worst Quarter (ended December 31, 2009, March 31, 2010, June 30, 2010 and December 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (8/17/1990)		0.05	%		2.44	%		2.31	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Institutional

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Institutional

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees		None

Other Expenses		0.06

Total Annual Fund Operating Expenses		0.29

Fee Waiver and/or Expense Reimbursement ¹		0.04

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.25


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Institutional Class shares to 0.25%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Institutional Class	$	26	$	89	$	159	$	364

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

9 Short-Term Investment Trust

instrumentalities, authorities thereof, and multi-state agencies, issued to obtain funds for various public purposes. Municipal lease obligations, synthetic municipal securities and certain types of industrial revenue bonds are treated as municipal securities. Synthetic municipal securities, which include variable rate instruments that are created when fixed rate bonds are coupled with a third party demand feature, are treated as municipal securities. Other securities held by the Fund may be structured with demand features which have the effect of shortening the security’s maturity.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

10 Short-Term Investment Trust

Annual Total Returns

Institutional Class year-to-date (ended September 30, 2011): 0.03%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.89%

Worst Quarter (ended March 31, 2010): 0.01%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Institutional Class: Inception (4/18/1983)		0.07	%		1.82	%		1.72	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Institutional Class fund accounts are as follows:

For Liquid Assets Portfolio


Initial Investments Per Fund Account*			$10 Million

Additional Investments Per Fund Account			No minimum

For STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

11 Short-Term Investment Trust

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

U.S. Government Obligations Risk . The Fund may invest in obligations issued by U.S. Government agencies and instrumentalities that may

13 Short-Term Investment Trust

receive varying levels of support from the government, which could affect the Fund’s ability to recover should they default.

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

15 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

16 Short-Term Investment Trust

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

The Adviser, Invesco Distributors, or one of their affiliates may, from time to time, at their expense out of their own financial resources make cash payments to financial intermediaries for marketing support and/or administrative support. These marketing support payments and administrative support payments are in addition to the payments by the Funds described in this prospectus. Because they are not paid by the Funds, these marketing support payments and administrative support payments will not change the price paid by investors for the purchase of the Funds’ shares or the amount that a Fund will receive as proceeds from such sales. In certain cases these cash payments could be significant to the financial intermediaries. These cash payments may also create an incentive for a financial intermediary to recommend or sell shares of the Funds to its customers. Please contact your financial intermediary for details about any payments they or their firm may receive in connection with the sale of shares of the Funds or the provision of services to the Funds. Also, please see the Funds’ SAI for more information of these types of payments.

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Institutional Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Institutional Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.15	%	$	15,240,109		0.14	% ^(c)		0.17	% ^(c)		0.15	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.19			16,317,110		0.14			0.18			0.20
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		1.30			20,264,356		0.16			0.21			1.17
Year ended 08/31/08		1.00		0.04	^(b)		0.00			0.04		(0.04	)		(0.00	)		(0.04	)		1.00		3.80			24,567,534		0.12			0.17			3.64
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.37			18,081,351		0.12			0.18			5.25

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.10			1,892,173		0.13	^(c)		0.19	^(c)		0.10	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.14			1,852,908		0.14			0.19			0.15
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.89			2,573,721		0.17			0.23			0.93
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.63			5,304,800		0.12			0.18			3.46
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		5.38			3,479,266		0.12			0.19			5.25

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			5,180,618		0.11	^(c)		0.18	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.05			4,530,503		0.14			0.18			0.04
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.39			4,882,282		0.15			0.20			0.37
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		2.93			4,639,164		0.12			0.18			2.66
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.17			3,306,283		0.12			0.19			5.03

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.05			5,655,734		0.11	^(c)		0.13	^(c)		0.05	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.11			4,543,024		0.13			0.13			0.11
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.73			9,814,845		0.14			0.15			0.60
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.42			1,971,451		0.12			0.14			3.28
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.31			1,328,964		0.12			0.15			5.18

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			376,002		0.10	^(c)		0.26	^(c)		0.04	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			175,670		0.13			0.26			0.05
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.59			535,957		0.15			0.30			0.51
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.28			226,983		0.12			0.24			3.30
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.21			321,456		0.12			0.30			5.08

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.06			502,025		0.23	^(c)		0.29	^(c)		0.06	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.07			679,088		0.25			0.29			0.07
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.91			829,400		0.27			0.31			1.04
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.72			1,765,515		0.22	^(d)		0.25	^(d)		1.76	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		3.28			3,256,572		0.22			0.25			3.23
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		3.41			2,870,218		0.22			0.25			3.36


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $16,610,265, $1,855,005, $4,736,767, $4,209,625, $376,202 and $570,856 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investment Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.14%		0	.17%		0	.17%		0	.17%		0	.17%		0	.17%		0	.17%		0	.17%		0	.17%		0	.17%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.86%		9	.92%		15	.23%		20	.80%		26	.63%		32	.75%		39	.16%		45	.88%		52	.93%		60	.32%
End of Year Balance	$	10,486	.00	$	10,992	.47	$	11,523	.41	$	12,079	.99	$	12,663	.45	$	13,275	.10	$	13,916	.29	$	14,588	.44	$	15,293	.07	$	16,031	.72
Estimated Annual Expenses	$	14	.34	$	18	.26	$	19	.14	$	20	.06	$	21	.03	$	22	.05	$	23	.11	$	24	.23	$	25	.40	$	26	.63

STIC Prime Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.14%		0	.19%		0	.19%		0	.19%		0	.19%		0	.19%		0	.19%		0	.19%		0	.19%		0	.19%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.86%		9	.90%		15	.19%		20	.73%		26	.54%		32	.62%		39	.00%		45	.69%		52	.70%		60	.04%
End of Year Balance	$	10,486	.00	$	10,990	.38	$	11,519	.01	$	12,073	.08	$	12,653	.79	$	13,262	.44	$	13,900	.36	$	14,568	.97	$	15,269	.74	$	16,004	.21
Estimated Annual Expenses	$	14	.34	$	20	.40	$	21	.38	$	22	.41	$	23	.49	$	24	.62	$	25	.80	$	27	.05	$	28	.35	$	29	.71

Treasury Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.14%		0	.18%		0	.18%		0	.18%		0	.18%		0	.18%		0	.18%		0	.18%		0	.18%		0	.18%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.86%		9	.91%		15	.21%		20	.77%		26	.59%		32	.69%		39	.08%		45	.79%		52	.81%		60	.18%
End of Year Balance	$	10,486	.00	$	10,991	.43	$	11,521	.21	$	12,076	.53	$	12,658	.62	$	13,268	.77	$	13,908	.32	$	14,578	.70	$	15,281	.40	$	16,017	.96
Estimated Annual Expenses	$	14	.34	$	19	.33	$	20	.26	$	21	.24	$	22	.26	$	23	.33	$	24	.46	$	25	.64	$	26	.87	$	28	.17

Government & Agency Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%		0	.13%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.87%		9	.98%		15	.33%		20	.95%		26	.84%		33	.02%		39	.50%		46	.29%		53	.41%		60	.88%
End of Year Balance	$	10,487	.00	$	10,997	.72	$	11,533	.31	$	12,094	.98	$	12,684	.00	$	13,301	.71	$	13,949	.51	$	14,628	.85	$	15,341	.27	$	16,088	.39
Estimated Annual Expenses	$	13	.32	$	13	.97	$	14	.65	$	15	.36	$	16	.11	$	16	.89	$	17	.71	$	18	.58	$	19	.48	$	20	.43

Government TaxAdvantage Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.14%		0	.26%		0	.26%		0	.26%		0	.26%		0	.26%		0	.26%		0	.26%		0	.26%		0	.26%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.86%		9	.83%		15	.04%		20	.49%		26	.20%		32	.18%		38	.45%		45	.01%		51	.88%		59	.08%
End of Year Balance	$	10,486	.00	$	10,983	.04	$	11,503	.63	$	12,048	.90	$	12,620	.02	$	13,218	.21	$	13,844	.75	$	14,501	.00	$	15,188	.34	$	15,908	.27
Estimated Annual Expenses	$	14	.34	$	27	.91	$	29	.23	$	30	.62	$	32	.07	$	33	.59	$	35	.18	$	36	.85	$	38	.60	$	40	.43

Tax-Free Cash Reserve Portfolio — INSTITUTIONAL	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.25%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%		0	.29%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.75%		9	.68%		14	.85%		20	.26%		25	.92%		31	.85%		38	.06%		44	.57%		51	.38%		58	.51%
End of Year Balance	$	10,475	.00	$	10,968	.37	$	11,484	.98	$	12,025	.93	$	12,592	.35	$	13,185	.45	$	13,806	.48	$	14,456	.77	$	15,137	.68	$	15,850	.66
Estimated Annual Expenses	$	25	.59	$	31	.09	$	32	.56	$	34	.09	$	35	.70	$	37	.38	$	39	.14	$	40	.98	$	42	.91	$	44	.93


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investment Trust

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Institutional Class accounts are as follows:

Liquid Assets Portfolio



	Initial		Additional
Class	Investments*		Investments

Institutional Class	$	10 million		No minimum

STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio



	Initial		Additional
Class	Investments*		Investments

Institutional Class	$	1 million		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.

A-1 The Invesco Funds—Institutional Class

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

A-2 The Invesco Funds—Institutional Class

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to

A-3 The Invesco Funds—Institutional Class

enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.


n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.


n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

A-4 The Invesco Funds—Institutional Class

Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

A-5 The Invesco Funds—Institutional Class

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-1


Prospectus	December 16, 2011







Liquid Assets Portfolio

STIC Prime Portfolio

Treasury Portfolio

Government & Agency Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

Personal Investment Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		3
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		8
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Distribution and Service (12b-1) Fees		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.92

Fee Waiver and/or Expense Reimbursement ²		0.23

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.69


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.69% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	70	$	270	$	487	$	1,110

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services

1 Short-Term Investment Trust

industries, the Fund’s performance will depend on the overall condition of those industries, which may be affected by the following factors: the supply of short-term financing; changes in government regulation and interest rates; and overall economy.

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.30%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Personal Investment Class: Inception (1/4/1999)		0.02	%		2.33	%		2.05	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

2 Short-Term Investment Trust

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.94

Fee Waiver and/or Expense Reimbursement ²		0.25

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.69


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.69% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	70	$	275	$	496	$	1,132

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

3 Short-Term Investment Trust

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.29%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Personal Investment Class: Inception (8/20/1991)		0.02	%		2.25	%		1.98	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

4 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.93

Fee Waiver and/or Expense Reimbursement ²		0.24

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.69


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.69% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	70	$	272	$	491	$	1,121

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

5 Short-Term Investment Trust

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.26%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Personal Investment Class: Inception (8/8/1991)		0.02	%		1.95	%		1.81	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.88

Fee Waiver and/or Expense Reimbursement ²		0.20

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.68


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.69% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	69	$	261	$	468	$	1,066

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio

6 Short-Term Investment Trust

securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.28%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Personal Investment Class: Inception (1/31/2000)		0.02	%		2.14	%		1.93	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

7 Short-Term Investment Trust

your salesperson or financial adviser or visit your financial intermediary’s Web site for more information.

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.08

Total Annual Fund Operating Expenses		1.01

Fee Waiver and/or Expense Reimbursement ²		0.32

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.69


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.69% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	70	$	290	$	527	$	1,207

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

8 Short-Term Investment Trust

a single holding could have an adverse impact on the Fund’s share price. The Fund’s share price can also be negatively affected during periods of high redemption pressures and/or illiquid markets. Further regulation could impact the way the Fund is managed, possibly negatively impacting its return. Additionally, the Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities.

Performance Information

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended December 31, 2006): 1.15%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Personal Investment Class: Inception (5/31/2001)		0.02	%		2.06	%		1.73	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Personal Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Personal Investment

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees ¹		0.75

Other Expenses		0.06

Total Annual Fund Operating Expenses		1.04

Fee Waiver and/or Expense Reimbursement ²		0.24

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.80


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Personal Investment Class shares to 0.80% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

9 Short-Term Investment Trust

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Personal Investment Class	$	82	$	307	$	551	$	1,249

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

10 Short-Term Investment Trust

tax exemption on municipal securities or otherwise adversely affect the current federal or state tax status of municipal securities.

Performance Information

Annual Total Returns

Personal Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.75%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Personal Investment Class: Inception (12/4/2000)		0.02	%		1.43	%		1.25	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Personal Investment Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

11 Short-Term Investment Trust

Statement of Additional Information (SAI) and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

12 Short-Term Investment Trust

agreements; (iv) commercial paper; (v) municipal securities; and (vi) master notes.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Repurchase Agreement Risk . If the seller of a repurchase agreement in which the Fund invests defaults on its obligation or declares bankruptcy,

13 Short-Term Investment Trust

the Fund may experience delays in selling the securities underlying the repurchase agreement. As a result, the Fund may incur losses arising from decline in the value of those securities, reduced levels of income and expenses of enforcing its rights.

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

14 Short-Term Investment Trust

present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury and Agency Securities, as well as repurchase agreements secured by those obligations.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

15 Short-Term Investment Trust

of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity

16 Short-Term Investment Trust

or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Personal Investment Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Personal Investment Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.02	%	$	107,681		0.27	% ^(c)		0.92	% ^(c)		0.02	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			111,477		0.31			0.93			0.03
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.78			145,663		0.66			0.96			0.67
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		3.23			118,757		0.67			0.92			3.09
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.80			81,408		0.67			0.93			4.70

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.02			84,451		0.22	^(c)		0.94	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			88,978		0.25			0.94			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.54			181,407		0.56			0.98			0.54
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.06			406,065		0.67			0.93			2.91
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		4.81			409,936		0.67			0.94			4.70

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			185,309		0.12	^(c)		0.93	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			173,428		0.15			0.93			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.12			211,723		0.45			0.95			0.07
Year ended 08/31/08		1.00		0.02	^(b)		0.00			0.02		(0.02	)		(0.00	)		(0.02	)		1.00		2.37			471,083		0.67			0.93			2.11
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.59			414,629		0.67			0.94			4.48

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			14,693		0.15	^(c)		0.88	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			13,982		0.21			0.88			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.33			17,752		0.57			0.90			0.17
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		2.86			29,764		0.67			0.89			2.73
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.73			26,598		0.67			0.90			4.63

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			4,801		0.11	^(c)		1.01	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			6,594		0.15			1.01			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.25			12,117		0.47			1.05			0.19
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		2.71			11,245		0.67			0.99			2.75
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.63			10,986		0.67			1.05			4.53

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.02			4,218		0.26	^(c)		1.04	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			7,514		0.29			1.04			0.03
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.55			7,414		0.67			1.06			0.64
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.49			40,145		0.77	^(d)		1.00	^(d)		1.21	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		2.71			34,464		0.77			1.00			2.68
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		2.84			33,670		0.77			1.00			2.81


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $104,235, $94,253, $175,824, $14,624, $6,205 and $4,974 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investment Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.69%		0	.92%		0	.92%		0	.92%		0	.92%		0	.92%		0	.92%		0	.92%		0	.92%		0	.92%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.31%		8	.57%		13	.00%		17	.61%		22	.40%		27	.40%		32	.60%		38	.01%		43	.64%		49	.50%
End of Year Balance	$	10,431	.00	$	10,856	.58	$	11,299	.53	$	11,760	.55	$	12,240	.39	$	12,739	.79	$	13,259	.58	$	13,800	.57	$	14,363	.63	$	14,949	.67
Estimated Annual Expenses	$	70	.49	$	97	.92	$	101	.92	$	106	.08	$	110	.40	$	114	.91	$	119	.60	$	124	.48	$	129	.56	$	134	.84

STIC Prime Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.69%		0	.94%		0	.94%		0	.94%		0	.94%		0	.94%		0	.94%		0	.94%		0	.94%		0	.94%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.31%		8	.54%		12	.95%		17	.54%		22	.31%		27	.28%		32	.44%		37	.82%		43	.42%		49	.24%
End of Year Balance	$	10,431	.00	$	10,854	.50	$	11,295	.19	$	11,753	.78	$	12,230	.98	$	12,727	.56	$	13,244	.30	$	13,782	.01	$	14,341	.56	$	14,923	.83
Estimated Annual Expenses	$	70	.49	$	100	.04	$	104	.10	$	108	.33	$	112	.73	$	117	.31	$	122	.07	$	127	.02	$	132	.18	$	137	.55

Treasury Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.69%		0	.93%		0	.93%		0	.93%		0	.93%		0	.93%		0	.93%		0	.93%		0	.93%		0	.93%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.31%		8	.56%		12	.97%		17	.57%		22	.36%		27	.34%		32	.52%		37	.91%		43	.53%		49	.37%
End of Year Balance	$	10,431	.00	$	10,855	.54	$	11,297	.36	$	11,757	.16	$	12,235	.68	$	12,733	.67	$	13,251	.93	$	13,791	.29	$	14,352	.59	$	14,936	.74
Estimated Annual Expenses	$	70	.49	$	98	.98	$	103	.01	$	107	.20	$	111	.57	$	116	.11	$	120	.83	$	125	.75	$	130	.87	$	136	.20

Government & Agency Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.68%		0	.88%		0	.88%		0	.88%		0	.88%		0	.88%		0	.88%		0	.88%		0	.88%		0	.88%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.32%		8	.62%		13	.09%		17	.75%		22	.60%		27	.66%		32	.91%		38	.39%		44	.09%		50	.03%
End of Year Balance	$	10,432	.00	$	10,861	.80	$	11,309	.30	$	11,775	.25	$	12,260	.39	$	12,765	.52	$	13,291	.46	$	13,839	.06	$	14,409	.23	$	15,002	.89
Estimated Annual Expenses	$	69	.47	$	93	.69	$	97	.55	$	101	.57	$	105	.76	$	110	.11	$	114	.65	$	119	.37	$	124	.29	$	129	.41

Government TaxAdvantage Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.69%		1	.01%		1	.01%		1	.01%		1	.01%		1	.01%		1	.01%		1	.01%		1	.01%		1	.01%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.31%		8	.47%		12	.80%		17	.30%		21	.98%		26	.85%		31	.91%		37	.17%		42	.65%		48	.34%
End of Year Balance	$	10,431	.00	$	10,847	.20	$	11,280	.00	$	11,730	.07	$	12,198	.10	$	12,684	.81	$	13,190	.93	$	13,717	.25	$	14,264	.57	$	14,833	.72
Estimated Annual Expenses	$	70	.49	$	107	.45	$	111	.74	$	116	.20	$	120	.84	$	125	.66	$	130	.67	$	135	.89	$	141	.31	$	146	.95

Tax-Free Cash Reserve Portfolio — PERSONAL INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.80%		1	.04%		1	.04%		1	.04%		1	.04%		1	.04%		1	.04%		1	.04%		1	.04%		1	.04%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.20%		8	.33%		12	.62%		17	.08%		21	.71%		26	.53%		31	.54%		36	.75%		42	.17%		47	.80%
End of Year Balance	$	10,420	.00	$	10,832	.63	$	11,261	.60	$	11,707	.56	$	12,171	.18	$	12,653	.16	$	13,154	.23	$	13,675	.13	$	14,216	.67	$	14,779	.65
Estimated Annual Expenses	$	81	.68	$	110	.51	$	114	.89	$	119	.44	$	124	.17	$	129	.09	$	134	.20	$	139	.51	$	145	.04	$	150	.78


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investment Trust

Distribution and Service (12b-1) Fees

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Personal Investment accounts are as follows:

Tax-Free Cash Reserve Portfolio



	Initial		Additional
Class	Investments*		Investments

Personal Investment Class	$	10,000		No minimum

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio



	Initial		Additional
Class	Investments*		Investments

Personal Investment Class	$	1,000		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.

A-1 The Invesco Funds

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.
By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

A-2 The Invesco Funds

business day after 5:30 p.m. Eastern Time, the redemption will be effected at the net asset value of each Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

A-3 The Invesco Funds

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.
n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a

A-4 The Invesco Funds


	Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

A-5 The Invesco Funds

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-6


Prospectus	December 16, 2011







Liquid Assets Portfolio (LPVXX)

STIC Prime Portfolio (SPVXX)

Treasury Portfolio (TPFXX)

Government & Agency Portfolio (GPVXX)

Government TaxAdvantage Portfolio (TXPXX)

Tax-Free Cash Reserve Portfolio (TRCXX)

Private Investment Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		2
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		7
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Distribution and Service (12b-1) Fees		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.67

Fee Waiver and/or Expense Reimbursement ²		0.23

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.44


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.44% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	45	$	191	$	350	$	813

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

1 Short-Term Investment Trust

those industries, which may be affected by the following factors: the supply of short-term financing; changes in government regulation and interest rates; and overall economy.

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.35%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (2/16/1996)		0.02	%		2.51	%		2.26	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

2 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.69

Fee Waiver and/or Expense Reimbursement ²		0.25

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.44


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.44% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	45	$	196	$	359	$	835

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

Performance Information

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.34%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (7/8/1993)		0.02	%		2.40	%		2.18	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.68

Fee Waiver and/or Expense Reimbursement ²		0.24

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.44


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.44% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	45	$	193	$	355	$	824

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

5 Short-Term Investment Trust

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.31%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (11/22/1991)		0.02	%		2.10	%		2.01	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.63

Fee Waiver and/or Expense Reimbursement ²		0.20

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.43


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.20% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.44% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	44	$	182	$	331	$	767

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

6 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.33%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (9/1/1998)		0.02	%		2.30	%		2.13	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

7 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.08

Total Annual Fund Operating Expenses		0.76

Fee Waiver and/or Expense Reimbursement ²		0.37

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.39


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.25% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.39% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	40	$	206	$	386	$	908

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

8 Short-Term Investment Trust

Performance Information

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.30%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (12/21/1994)		0.02	%		2.25	%		2.09	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Private Investment

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Private Investment

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees ¹		0.50

Other Expenses		0.06

Total Annual Fund Operating Expenses		0.79

Fee Waiver and/or Expense Reimbursement ²		0.29

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.50


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.25% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Private Investment Class shares to 0.50% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Private Investment Class	$	51	$	223	$	410	$	951

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

9 Short-Term Investment Trust

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

10 Short-Term Investment Trust

Annual Total Returns

Private Investment Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.82%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Private Investment Class: Inception (4/1/1992)		0.02	%		1.63	%		1.50	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Private Investment Class fund accounts are as follows:


Initial Investments Per Fund Account*			$100,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Risks

The principal risks of investing in the Fund are:

Foreign Credit Exposure Risk . U.S. dollar denominated securities carrying foreign credit exposure may be affected by unfavorable political,

11 Short-Term Investment Trust

economic or governmental developments that could affect payments of principal and interest.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

13 Short-Term Investment Trust

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or

15 Short-Term Investment Trust

other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Credit Risk . The issuers of instruments in which the Fund invests may be unable to meet interest and/or principal payments. An issuer’s

16 Short-Term Investment Trust

securities may decrease in value if its financial strength weakens, which may reduce its credit rating and possibly its ability to meet its contractual obligations.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Private Investment Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Private Investment Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.02	%	$	501,630		0.28	% ^(c)		0.67	% ^(c)		0.01	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			709,454		0.31			0.68			0.03
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		1.00			748,744		0.46			0.71			0.87
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		3.49			875,556		0.42			0.67			3.34
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.06			885,779		0.42			0.68			4.95

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.02			267,621		0.22	^(c)		0.69	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			306,984		0.25			0.69			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.64			429,979		0.42			0.73			0.68
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.32			700,843		0.42			0.68			3.16
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		5.07			632,811		0.42			0.69			4.95

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			845,022		0.12	^(c)		0.68	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			784,322		0.16			0.68			0.02
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.19			2,267,919		0.31			0.70			0.21
Year ended 08/31/08		1.00		0.02	^(b)		0.00			0.02		(0.02	)		(0.00	)		(0.02	)		1.00		2.62			1,153,785		0.42			0.68			2.36
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.85			1,250,648		0.42			0.69			4.73

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			549,857		0.15	^(c)		0.63	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			558,000		0.21			0.63			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.46			781,264		0.39			0.65			0.35
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.12			504,696		0.42			0.64			2.98
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.99			599,041		0.42			0.65			4.88

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			47,638		0.11	^(c)		0.76	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			28,423		0.14			0.76			0.04
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.38			42,922		0.35			0.80			0.31
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.02			40,540		0.37			0.74			3.05
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		4.95			43,318		0.37			0.80			4.83

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.02			98,842		0.26	^(c)		0.79	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			118,919		0.29			0.79			0.03
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.70			206,398		0.48			0.81			0.83
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.62			300,898		0.47	^(d)		0.75	^(d)		1.51	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		3.02			249,372		0.47			0.75			2.98
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		3.15			185,163		0.47			0.75			3.11


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $521,465, $307,821, $818,828, $502,249, $44,401 and $96,498 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investments Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.44%		0	.67%		0	.67%		0	.67%		0	.67%		0	.67%		0	.67%		0	.67%		0	.67%		0	.67%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.56%		9	.09%		13	.81%		18	.74%		23	.88%		29	.24%		34	.84%		40	.68%		46	.77%		53	.13%
End of Year Balance	$	10,456	.00	$	10,908	.74	$	11,381	.09	$	11,873	.89	$	12,388	.03	$	12,924	.44	$	13,484	.06	$	14,067	.92	$	14,677	.07	$	15,312	.58
Estimated Annual Expenses	$	45	.00	$	71	.57	$	74	.67	$	77	.90	$	81	.28	$	84	.80	$	88	.47	$	92	.30	$	96	.30	$	100	.47

STIC Prime Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.44%		0	.69%		0	.69%		0	.69%		0	.69%		0	.69%		0	.69%		0	.69%		0	.69%		0	.69%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.56%		9	.07%		13	.77%		18	.67%		23	.79%		29	.12%		34	.69%		40	.49%		46	.55%		52	.86%
End of Year Balance	$	10,456	.00	$	10,906	.65	$	11,376	.73	$	11,867	.07	$	12,378	.54	$	12,912	.05	$	13,468	.56	$	14,049	.06	$	14,654	.57	$	15,286	.18
Estimated Annual Expenses	$	45	.00	$	73	.70	$	76	.88	$	80	.19	$	83	.65	$	87	.25	$	91	.01	$	94	.94	$	99	.03	$	103	.30

Treasury Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.44%		0	.68%		0	.68%		0	.68%		0	.68%		0	.68%		0	.68%		0	.68%		0	.68%		0	.68%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.56%		9	.08%		13	.79%		18	.70%		23	.83%		29	.18%		34	.76%		40	.58%		46	.66%		52	.99%
End of Year Balance	$	10,456	.00	$	10,907	.70	$	11,378	.91	$	11,870	.48	$	12,383	.29	$	12,918	.24	$	13,476	.31	$	14,058	.49	$	14,665	.81	$	15,299	.38
Estimated Annual Expenses	$	45	.00	$	72	.64	$	75	.77	$	79	.05	$	82	.46	$	86	.03	$	89	.74	$	93	.62	$	97	.66	$	101	.88

Government & Agency Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.43%		0	.63%		0	.63%		0	.63%		0	.63%		0	.63%		0	.63%		0	.63%		0	.63%		0	.63%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.57%		9	.14%		13	.91%		18	.89%		24	.08%		29	.50%		35	.16%		41	.07%		47	.24%		53	.67%
End of Year Balance	$	10,457	.00	$	10,913	.97	$	11,390	.91	$	11,888	.69	$	12,408	.23	$	12,950	.47	$	13,516	.41	$	14,107	.07	$	14,723	.55	$	15,366	.97
Estimated Annual Expenses	$	43	.98	$	67	.32	$	70	.26	$	73	.33	$	76	.54	$	79	.88	$	83	.37	$	87	.01	$	90	.82	$	94	.79

Government TaxAdvantage Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.39%		0	.76%		0	.76%		0	.76%		0	.76%		0	.76%		0	.76%		0	.76%		0	.76%		0	.76%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.61%		9	.05%		13	.67%		18	.49%		23	.51%		28	.75%		34	.21%		39	.90%		45	.83%		52	.01%
End of Year Balance	$	10,461	.00	$	10,904	.55	$	11,366	.90	$	11,848	.86	$	12,351	.25	$	12,874	.94	$	13,420	.84	$	13,989	.88	$	14,583	.05	$	15,201	.37
Estimated Annual Expenses	$	39	.90	$	81	.19	$	84	.63	$	88	.22	$	91	.96	$	95	.86	$	99	.92	$	104	.16	$	108	.58	$	113	.18

Tax-Free Cash Reserve Portfolio — PRIVATE INVESTMENT CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.50%		0	.79%		0	.79%		0	.79%		0	.79%		0	.79%		0	.79%		0	.79%		0	.79%		0	.79%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.50%		8	.90%		13	.48%		18	.26%		23	.24%		28	.43%		33	.84%		39	.47%		45	.34%		51	.46%
End of Year Balance	$	10,450	.00	$	10,889	.95	$	11,348	.41	$	11,826	.18	$	12,324	.06	$	12,842	.90	$	13,383	.59	$	13,947	.04	$	14,534	.21	$	15,146	.10
Estimated Annual Expenses	$	51	.13	$	84	.29	$	87	.84	$	91	.54	$	95	.39	$	99	.41	$	103	.59	$	107	.96	$	112	.50	$	117	.24


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investments Trust

Distribution and Service (12b-1) Fees

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Private Investment Class accounts are as follows:



	Initial		Additional
Class	Investments*		Investments

Private Investment Class	$	100,000		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.

A-1 The Invesco Funds

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

A-2 The Invesco Funds

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to

A-3 The Invesco Funds

enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.
n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

A-4 The Invesco Funds

Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

A-5 The Invesco Funds

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-5


Prospectus	December 16, 2011







Liquid Assets Portfolio

STIC Prime Portfolio

Treasury Portfolio

Government & Agency Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

Reserve Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		2
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		8
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Distribution and Service (12b-1) Fees		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.02

Total Annual Fund Operating Expenses		1.17

Fee Waiver and/or Expense Reimbursement ²		0.16

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.01


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.01% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	103	$	356	$	628	$	1,406

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

1 Short-Term Investment Trust

those industries, which may be affected by the following factors: the supply of short-term financing; changes in government regulation and interest rates; and overall economy.

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.23%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Reserve Class: Inception (1/14/2000)		0.02	%		2.11	%		1.78	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

2 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.04

Total Annual Fund Operating Expenses		1.19

Fee Waiver and/or Expense Reimbursement ²		0.18

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.01


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.01% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	103	$	360	$	637	$	1,427

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

Performance Information

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.21%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Reserve Class: Inception (1/4/1999)		0.02	%		2.05	%		1.73	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.03

Total Annual Fund Operating Expenses		1.18

Fee Waiver and/or Expense Reimbursement ²		0.17

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.01


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.01% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	103	$	358	$	633	$	1,417

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

5 Short-Term Investment Trust

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.18%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Reserve Class: Inception (1/4/1999)		0.02	%		1.78	%		1.57	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.03

Total Annual Fund Operating Expenses		1.13

Fee Waiver and/or Expense Reimbursement ²		0.13

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.00


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.01% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	102	$	346	$	610	$	1,363

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

6 Short-Term Investment Trust

invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term ratings category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.21%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Reserve Class: Inception (1/26/2000)		0.02	%		1.94	%		1.67	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

7 Short-Term Investment Trust

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.08

Total Annual Fund Operating Expenses		1.26

Fee Waiver and/or Expense Reimbursement ²		0.25

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.01


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.01% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	103	$	375	$	668	$	1,501

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

8 Short-Term Investment Trust

its return. Additionally, the Fund’s yield will vary as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in other securities.

Performance Information

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended December 31, 2006): 1.07%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			Since
	Year			Years			Inception

Reserve Class: Inception (6/23/2003)		0.02	%		1.87	%		1.59	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Reserve

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Reserve

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees ¹		1.00

Other Expenses		0.06

Total Annual Fund Operating Expenses		1.29

Fee Waiver and/or Expense Reimbursement ²		0.17

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		1.12


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.13% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Reserve Class shares to 1.12% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Reserve Class	$	114	$	392	$	691	$	1,542

Principal Investment Strategies of the Fund

9 Short-Term Investment Trust

tax purposes and does not constitute an item of preference for purposes of the alternative minimum tax.

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

10 Short-Term Investment Trust

Performance Information

Annual Total Returns

Reserve Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.67%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Reserve Class: Inception (6/1/1999)		0.02	%		1.24	%		1.01	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Reserve Class fund accounts are as follows:

For Tax-Free Cash Reserve Portfolio


Initial Investments Per Fund Account*			$10,000

Additional Investments Per Fund Account			No minimum

For Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio


Initial Investments Per Fund Account*			$1,000

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

11 Short-Term Investment Trust

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

U.S. Government Obligations Risk . The Fund may invest in obligations issued by U.S. Government agencies and instrumentalities that may

13 Short-Term Investment Trust

receive varying levels of support from the government, which could affect the Fund’s ability to recover should they default.

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

15 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

16 Short-Term Investment Trust

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Reserve Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Reserve Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.02	%	$	90,227		0.27	% ^(c)		1.17	% ^(c)		0.02	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			108,972		0.30			1.18			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.59			73,020		0.86			1.21			0.47
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		2.90			69,076		0.99			1.17			2.77
Year ended 08/31/07		1.00		0.04			0.00			0.04		(0.04	)		—			(0.04	)		1.00		4.46			39,244		0.99			1.18			4.38

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.02			6,788		0.23	^(c)		1.19	^(c)		0.01	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			8,034		0.25			1.19			0.04
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.42			9,341		0.79			1.23			0.31
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		2.73			65,753		0.99			1.18			2.59
Year ended 08/31/07		1.00		0.04			—			0.04		(0.04	)		—			(0.04	)		1.00		4.47			30,950		0.99			1.19			4.38

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			148,671		0.12	^(c)		1.18	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			51,749		0.15			1.18			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.09			29,734		0.49			1.20			0.03
Year ended 08/31/08		1.00		0.02	^(b)		0.00			0.02		(0.02	)		(0.00	)		(0.02	)		1.00		2.04			36,392		0.99			1.18			1.79
Year ended 08/31/07		1.00		0.04			0.00			0.04		(0.04	)		—			(0.04	)		1.00		4.26			69,762		0.99			1.19			4.16

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			70,376		0.16	^(c)		1.13	^(c)		0.01	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			183,851		0.21			1.13			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.22			139,399		0.66			1.15			0.08
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		2.53			135,106		0.99			1.14			2.41
Year ended 08/31/07		1.00		0.04			0.00			0.04		(0.04	)		—			(0.04	)		1.00		4.40			16,949		0.99			1.15			4.31

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			874		0.11	^(c)		1.26	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			844		0.14			1.26			0.04
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.16			5,747		0.70			1.30			(0.04	)
Year ended 08/31/08		1.00		0.02	^(b)		0.00			0.02		(0.02	)		—			(0.02	)		1.00		2.38			12,521		0.99			1.24			2.43
Year ended 08/31/07		1.00		0.04			0.00			0.04		(0.04	)		—			(0.04	)		1.00		4.30			11,944		0.99			1.30			4.21

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.02			18,284		0.26	^(c)		1.29	^(c)		0.03	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			14,742		0.29			1.29			0.03
Year ended 08/31/09		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.44			14,831		0.82			1.31			0.49
Five months ended 08/31/08		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.36			43,123		1.09	^(d)		1.25	^(d)		0.89	^(d)
Year ended 03/31/08		1.00		0.02			(0.00	)		0.02		(0.02	)		—			(0.02	)		1.00		2.38			60,789		1.09			1.25			2.36
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		2.52			12,733		1.09			1.25			2.49


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $109,805, $6,890, $94,388, $100,051, $1,404 and $19,096 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investment Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.01%		1	.17%		1	.17%		1	.17%		1	.17%		1	.17%		1	.17%		1	.17%		1	.17%		1	.17%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		3	.99%		7	.97%		12	.11%		16	.40%		20	.86%		25	.49%		30	.30%		35	.29%		40	.47%		45	.85%
End of Year Balance	$	10,399	.00	$	10,797	.28	$	11,210	.82	$	11,640	.19	$	12,086	.01	$	12,548	.91	$	13,029	.53	$	13,528	.56	$	14,046	.70	$	14,584	.69
Estimated Annual Expenses	$	103	.01	$	124	.00	$	128	.75	$	133	.68	$	138	.80	$	144	.11	$	149	.63	$	155	.36	$	161	.32	$	167	.49

STIC Prime Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.01%		1	.19%		1	.19%		1	.19%		1	.19%		1	.19%		1	.19%		1	.19%		1	.19%		1	.19%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		3	.99%		7	.95%		12	.06%		16	.33%		20	.77%		25	.37%		30	.14%		35	.10%		40	.25%		45	.59%
End of Year Balance	$	10,399	.00	$	10,795	.20	$	11,206	.50	$	11,633	.47	$	12,076	.70	$	12,536	.82	$	13,014	.48	$	13,510	.33	$	14,025	.07	$	14,559	.43
Estimated Annual Expenses	$	103	.01	$	126	.11	$	130	.91	$	135	.90	$	141	.08	$	146	.45	$	152	.03	$	157	.82	$	163	.84	$	170	.08

Treasury Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.01%		1	.18%		1	.18%		1	.18%		1	.18%		1	.18%		1	.18%		1	.18%		1	.18%		1	.18%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		3	.99%		7	.96%		12	.09%		16	.37%		20	.81%		25	.43%		30	.22%		35	.19%		40	.36%		45	.72%
End of Year Balance	$	10,399	.00	$	10,796	.24	$	11,208	.66	$	11,636	.83	$	12,081	.36	$	12,542	.86	$	13,022	.00	$	13,519	.44	$	14,035	.88	$	14,572	.05
Estimated Annual Expenses	$	103	.01	$	125	.05	$	129	.83	$	134	.79	$	139	.94	$	145	.28	$	150	.83	$	156	.59	$	162	.58	$	168	.79

Government & Agency Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.00%		1	.13%		1	.13%		1	.13%		1	.13%		1	.13%		1	.13%		1	.13%		1	.13%		1	.13%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.00%		8	.02%		12	.21%		16	.55%		21	.06%		25	.74%		30	.61%		35	.66%		40	.91%		46	.37%
End of Year Balance	$	10,400	.00	$	10,802	.48	$	11,220	.54	$	11,654	.77	$	12,105	.81	$	12,574	.31	$	13,060	.93	$	13,566	.39	$	14,091	.41	$	14,636	.75
Estimated Annual Expenses	$	102	.00	$	119	.79	$	124	.43	$	129	.25	$	134	.25	$	139	.44	$	144	.84	$	150	.44	$	156	.27	$	162	.31

Government TaxAdvantage Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.01%		1	.26%		1	.26%		1	.26%		1	.26%		1	.26%		1	.26%		1	.26%		1	.26%		1	.26%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		3	.99%		7	.88%		11	.91%		16	.10%		20	.44%		24	.95%		29	.62%		34	.47%		39	.50%		44	.71%
End of Year Balance	$	10,399	.00	$	10,787	.92	$	11,191	.39	$	11,609	.95	$	12,044	.16	$	12,494	.61	$	12,961	.91	$	13,446	.69	$	13,949	.59	$	14,471	.31
Estimated Annual Expenses	$	103	.01	$	133	.48	$	138	.47	$	143	.65	$	149	.02	$	154	.59	$	160	.38	$	166	.37	$	172	.60	$	179	.05

Tax-Free Cash Reserve Portfolio — RESERVE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		1	.12%		1	.29%		1	.29%		1	.29%		1	.29%		1	.29%		1	.29%		1	.29%		1	.29%		1	.29%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		3	.88%		7	.73%		11	.73%		15	.88%		20	.18%		24	.63%		29	.26%		34	.05%		39	.03%		44	.18%
End of Year Balance	$	10,388	.00	$	10,773	.39	$	11,173	.09	$	11,587	.61	$	12,017	.51	$	12,463	.36	$	12,925	.75	$	13,405	.30	$	13,902	.63	$	14,418	.42
Estimated Annual Expenses	$	114	.17	$	136	.49	$	141	.55	$	146	.81	$	152	.25	$	157	.90	$	163	.76	$	169	.84	$	176	.14	$	182	.67


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investment Trust

Distribution and Service (12b-1) Fees

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Reserve Class accounts are as follows:

Tax-Free Cash Reserve Portfolio



	Initial		Additional
Class	Investments*		Investments

Reserve Class	$	10,000		No minimum

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio and Government TaxAdvantage Portfolio



	Initial		Additional
Class	Investments*		Investments

Reserve Class	$	1,000		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.

A-1 The Invesco Funds

MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.
By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

A-2 The Invesco Funds

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

A-3 The Invesco Funds

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.


n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.


n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a

A-4 The Invesco Funds


	Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

A-5 The Invesco Funds

If you have questions about an Invesco Fund or your account, or you wish to obtain a free copy of the Fund’s current SAI, annual or semi-annual reports or Form N-Q, please contact us.


By Mail:		Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286

By Telephone:		(800) 659-1005

On the Internet:		You can send us a request by e-mail or download prospectuses, SAIs, annual or semi-annual reports via our Web site: www.invesco.com/us





Liquid Assets Portfolio STIC Prime Portfolio Treasury Portfolio and		Government & Agency Portfolio Government TaxAdvantage Portfolio Tax-Free Cash Reserve Portfolio
SEC 1940 Act file number: 811-02729


invesco.com/us CM-STIT-PRO-7


Prospectus	December 16, 2011







Liquid Assets Portfolio

STIC Prime Portfolio

Treasury Portfolio

Government & Agency Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

Resource Classes

Liquid Assets Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

STIC Prime Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Treasury Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government & Agency Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Government TaxAdvantage Portfolio’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Tax-Free Cash Reserve Portfolio’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

An investment in the Funds:

n is not FDIC insured;

n may lose value; and

n is not guaranteed by a bank.

There can be no assurance that each Fund will be able to maintain a stable net asset value of $1.00 per share.

Table of Contents



Fund Summaries		1
Liquid Assets Portfolio		1
STIC Prime Portfolio		2
Treasury Portfolio		4
Government & Agency Portfolio		6
Government TaxAdvantage Portfolio		7
Tax-Free Cash Reserve Portfolio		9

Investment Objective(s), Strategies, Risks and Portfolio Holdings		11
Liquid Assets Portfolio		11
STIC Prime Portfolio		12
Treasury Portfolio		14
Government & Agency Portfolio		14
Government TaxAdvantage Portfolio		15
Tax-Free Cash Reserve Portfolio		16


Fund Management		17
The Adviser(s)		17
Adviser Compensation		17


Other Information		18
Dividends and Distributions		18


Financial Highlights		19


Hypothetical Investment and Expense Information		20


General Information		A-1
Distribution and Service (12b-1) Fees		A-1
Purchasing Shares		A-1
Redeeming Shares		A-2
Pricing of Shares		A-3
Frequent Purchases and Redemptions of Fund Shares		A-4
Taxes		A-4
Important Notice Regarding Delivery of Security Holder Documents		A-5


Obtaining Additional Information		Back Cover

Short-Term Investment Trust

LIQUID ASSETS PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees		0.20

Other Expenses		0.02

Total Annual Fund Operating Expenses		0.37

Fee Waiver and/or Expense Reimbursement ¹		0.03

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.34


1		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.34%. Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	35	$	116	$	205	$	465

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

1 Short-Term Investment Trust

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.38%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (9/23/1996)		0.03	%		2.58	%		2.35	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

STIC PRIME PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

2 Short-Term Investment Trust



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.20

Other Expenses		0.04

Total Annual Fund Operating Expenses		0.39

Fee Waiver and/or Expense Reimbursement ²		0.09

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.30


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.04% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.30% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	31	$	116	$	210	$	484

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

3 Short-Term Investment Trust

Performance Information

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.37%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (1/16/1996)		0.03	%		2.50	%		2.30	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TREASURY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None

4 Short-Term Investment Trust



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.15	%

Distribution and/or Service (12b-1) Fees ¹		0.20

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.38

Fee Waiver and/or Expense Reimbursement ²		0.08

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.30


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.04% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.30% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	31	$	114	$	205	$	473

Principal Investment Strategies of the Fund

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

5 Short-Term Investment Trust

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.34%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (3/6/1996)		0.02	%		2.19	%		2.12	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT & AGENCY PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.10	%

Distribution and/or Service (12b-1) Fees ¹		0.20

Other Expenses		0.03

Total Annual Fund Operating Expenses		0.33

Fee Waiver and/or Expense Reimbursement ²		0.04

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.29


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.04% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.30% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	30	$	102	$	181	$	414

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

6 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.37%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (9/1/1998)		0.02	%		2.40	%		2.25	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

GOVERNMENT TAXADVANTAGE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide current income consistent with preservation of capital and liquidity.

7 Short-Term Investment Trust

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.18	%

Distribution and/or Service (12b-1) Fees ¹		0.20

Other Expenses		0.08

Total Annual Fund Operating Expenses		0.46

Fee Waiver and/or Expense Reimbursement ²		0.16

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.30


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.04% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.30% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	31	$	131	$	242	$	564

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund also seeks to distribute dividends that are exempt from state and local taxation in many states.

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

8 Short-Term Investment Trust

Performance Information

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended March 31, 2001): 1.33%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (12/30/1999)		0.02	%		2.31	%		2.17	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

The Fund’s distributions generally are taxable to you as ordinary income, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or individual retirement account.

Payments to Broker-Dealers and Other Financial Intermediaries

TAX-FREE CASH RESERVE PORTFOLIO

Investment Objective(s)

The Fund’s investment objective is to provide tax-exempt income consistent with preservation of capital and liquidity.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.



Shareholder Fees (fees paid directly from your investment)

Class:	Resource

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)		None

Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is less)		None



Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Class:	Resource

Management Fees		0.23	%

Distribution and/or Service (12b-1) Fees ¹		0.20

Other Expenses		0.06

Total Annual Fund Operating Expenses		0.49

Fee Waiver and/or Expense Reimbursement ²		0.08

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement		0.41


1		Invesco Distributors, Inc. (Invesco Distributors) has contractually agreed, through at least December 31, 2012, to waive 0.04% of Rule 12b-1 distribution plan payments. Unless the Board of Trustees and Invesco Advisers, Inc. mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.
2		Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed, through at least December 31, 2012 to waive advisory fees and/or reimburse expenses of all shares to the extent necessary to limit Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding certain items discussed in the SAI) of Resource Class shares to 0.41% (after Rule 12b-1 fee waiver). Unless the Board of Trustees and Invesco mutually agree to amend or continue the fee waiver agreement, it will terminate on December 31, 2012.

Example. This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

Although your actual costs may be higher or lower, based on these assumptions, your costs would be:


	1 Year		3 Years		5 Years		10 Years

Resource Class	$	42	$	149	$	266	$	608

Principal Investment Strategies of the Fund

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

9 Short-Term Investment Trust

The Fund is a money market fund that seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The Fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Principal Risks of Investing in the Fund

Liquidity Risk . The Fund may hold illiquid securities that it may be unable to sell at the preferred time or price and could lose its entire investment in such securities.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Performance Information

10 Short-Term Investment Trust

Annual Total Returns

Resource Class year-to-date (ended September 30, 2011): 0.02%

Best Quarter (ended June 30, 2007 and September 30, 2007): 0.85%

Worst Quarter (ended March 31, 2010): 0.00%



Average Annual Total Returns (for the periods ended December 31, 2010)

	1			5			10
	Year			Years			Years

Resource Class: Inception (4/6/1999)		0.02	%		1.69	%		1.57	%

Management of the Fund

Investment Adviser: Invesco Advisers, Inc.

Purchase and Sale of Fund Shares

You may purchase or redeem shares of a Fund on any business day the Fund is open through your financial intermediary, by telephone at (800) 659-1005, or through Liquidity LINK.

The minimum investments for Resource Class fund accounts are as follows:


Initial Investments Per Fund Account*			$1 Million

Additional Investments Per Fund Account			No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Investment Objective(s), Strategies, Risks and Portfolio Holdings

Liquid Assets Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

Risks

The principal risks of investing in the Fund are:

Foreign Credit Exposure Risk . U.S. dollar denominated securities carrying foreign credit exposure may be affected by unfavorable political,

11 Short-Term Investment Trust

economic or governmental developments that could affect payments of principal and interest.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

STIC Prime Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

12 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

13 Short-Term Investment Trust

Treasury Portfolio

Objective(s) and Strategies

The Fund invests predominately in those securities that are First Tier Securities (defined below) at the time of purchase.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government & Agency Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

14 Short-Term Investment Trust

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Government TaxAdvantage Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

As permitted by Rule 2a-7 under the Investment Company Act of 1940 (Rule 2a-7), the Fund seeks to maintain a stable price of $1.00 per share by using the amortized cost method to value portfolio securities and rounding the share value to the nearest cent. The Fund invests in conformity with SEC rules and regulation requirements for money market funds for the quality, maturity, diversification and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 days of the date of purchase, with certain exceptions permitted by applicable regulations. The fund maintains a dollar-weighted average portfolio maturity of no more than 60 days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 of no more than 120 days. Each investment must be determined to present minimal credit risks by the Fund’s Adviser pursuant to guidelines approved by the Fund’s Board of Trustees, and must be an “Eligible Security” as defined under applicable regulations. First Tier Securities generally means Eligible Securities rated within the highest short-term rating category, an unrated security of comparable quality as determined by the Adviser under the supervision of the Board of Trustees, U.S. Government Securities as defined by applicable regulations, and securities issued by other registered money market funds.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or

15 Short-Term Investment Trust

other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Tax-Free Cash Reserve Portfolio

Objective(s) and Strategies

The Fund will limit investments to those securities that are First Tier Securities (defined below) at the time of purchase.

The Fund may also invest in securities whether or not considered foreign securities, which carry foreign credit exposure.

The portfolio structure is driven to some extend by the supply and availability of municipal obligations.

The portfolio managers normally hold portfolio securities to maturity, but may sell a security when they deem it advisable, such as when market or credit factors materially change.

The Fund may, from time to time, take temporary defensive positions by holding cash, shortening the Fund’s dollar-weighted average maturity or investing in other securities that are eligible securities for purchase by money market funds as described in this prospectus and the Fund’s SAI and that are consistent with the Fund’s principal investment strategies, in anticipation of, or in response to, adverse market, economic, political or other conditions. It is possible that such investments could affect the Fund’s returns.

Risks

The principal risks of investing in the Fund are:

Credit Risk . The issuers of instruments in which the Fund invests may be unable to meet interest and/or principal payments. An issuer’s

16 Short-Term Investment Trust

securities may decrease in value if its financial strength weakens, which may reduce its credit rating and possibly its ability to meet its contractual obligations.

Industry Focus Risk . To the extent the Fund invests in securities issued or guaranteed by companies in the banking and financial services industries, the Fund’s performance will depend on the overall condition of those industries. Financial services companies are highly dependent on the supply of short-term financing. The value of securities of issuers in the banking and financial services industry can be sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad.

Management Risk . The investment techniques and risk analysis used by the Fund’s portfolio managers may not produce the desired results.

Portfolio Holdings

A description of Fund policies and procedures with respect to the disclosure of Fund portfolio holdings is available in the SAI, which is available at www.invesco.com/us.

Fund Management

The Adviser(s)

Pending Litigation. Detailed information concerning pending litigation can be found in the SAI.

Adviser Compensation

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.10% of Liquid Assets Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.09% of STIC Prime Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.08% of Treasury Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.04% of Government & Agency Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

During the fiscal year ended August 31, 2011, the Adviser received compensation of 0.17% of Tax-Free Cash Reserve Portfolio’s average daily net assets after fee waiver and/or expense reimbursement.

17 Short-Term Investment Trust

Dividends and Distributions

Liquid Assets Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

STIC Prime Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Treasury Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government & Agency Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Government TaxAdvantage Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of ordinary income.

Tax-Free Cash Reserve Portfolio expects, based on its investment objective and strategies, that its distributions, if any, will consist primarily of tax-exempt income.

Dividends

Liquid Assets Portfolio generally declares dividends from net investment income daily and pays them monthly.

STIC Prime Portfolio generally declares dividends from net investment income daily and pays them monthly.

Treasury Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government & Agency Portfolio generally declares dividends from net investment income daily and pays them monthly.

Government TaxAdvantage Portfolio generally declares dividends from net investment income daily and pays them monthly.

Tax-Free Cash Reserve Portfolio generally declares dividends from net investment income daily and pays them monthly.

Capital Gains Distributions

18 Short-Term Investment Trust

Hypothetical Investment and Expense Information

The financial highlights tables are intended to help you understand each Fund’s financial performance of the Resource Class shares. Certain information reflects financial results for a single Fund share.

The total returns in the tables represent the rate that an investor would have earned (or lost) on an investment in each Fund (assuming reinvestment of all dividends and distributions).

The information has been audited by PricewaterhouseCoopers LLP, whose report, along with the Fund’s financial statements, is included in the Fund’s annual report, which is available upon request.

Resource Class


																											Ratio of			Ratio of
						Net gains																					expenses			expenses
						(losses)																					to average			to average net			Ratio of net
	Net asset					on securities					Dividends			Distributions													net assets			assets without			investment
	value,		Net			(both			Total from		from net			from net						Net asset					Net assets,		with fee waivers			fee waivers			income
	beginning		investment			realized and			investment		investment			realized			Total			value, end		Total			end of period		and/or expenses			and/or expenses			to average
	of period		income			unrealized)			operations		income			gains			Distributions			of period		Return ^(a)			(000s omitted)		absorbed			absorbed			net assets


Liquid Assets Portfolio
Year ended 08/31/11	$	1.00	$	0.00	^(b)	$	(0.00	)	$	0.00	$	(0.00	)	$	—		$	(0.00	)	$	1.00		0.02	%	$	177,081		0.27	% ^(c)		0.37	% ^(c)		0.02	% ^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.04			261,421		0.30			0.38			0.04
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		1.10			800,343		0.36			0.41			0.97
Year ended 08/31/08		1.00		0.04	^(b)		0.00			0.04		(0.04	)		(0.00	)		(0.04	)		1.00		3.59			1,209,510		0.32			0.37			3.44
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.16			1,128,499		0.32			0.38			5.05

STIC Prime Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		—			0.00		(0.00	)		—			(0.00	)		1.00		0.02			29,213		0.23	^(c)		0.39	^(c)		0.01	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			151,109		0.25			0.39			0.04
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.74			223,532		0.31			0.43			0.79
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.46			482,644		0.28			0.38			3.30
Year ended 08/31/07		1.00		0.05			—			0.05		(0.05	)		—			(0.05	)		1.00		5.21			570,226		0.28			0.39			5.09

Treasury Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			293,547		0.12	^(c)		0.38	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			409,398		0.15			0.38			0.03
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.26			365,409		0.28			0.40			0.24
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		(0.00	)		(0.03	)		1.00		2.76			629,203		0.28			0.38			2.50
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.00			375,750		0.28			0.39			4.87

Government & Agency Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.02			272,176		0.15	^(c)		0.33	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			294,164		0.21			0.33			0.03
Year ended 08/31/09		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.57			486,522		0.30			0.35			0.44
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.26			325,692		0.28			0.34			3.12
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.14			297,561		0.28			0.35			5.02

Government TaxAdvantage Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			17,085		0.11	^(c)		0.46	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			11,160		0.14			0.46			0.04
Year ended 08/31/09		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.45			17,773		0.29			0.50			0.37
Year ended 08/31/08		1.00		0.03	^(b)		0.00			0.03		(0.03	)		—			(0.03	)		1.00		3.11			34,121		0.28			0.44			3.14
Year ended 08/31/07		1.00		0.05			0.00			0.05		(0.05	)		—			(0.05	)		1.00		5.04			53,228		0.28			0.50			4.92

Tax-Free Cash Reserve Portfolio
Year ended 08/31/11		1.00		0.00	^(b)		(0.00	)		0.00		(0.00	)		—			(0.00	)		1.00		0.02			24,602		0.27	^(c)		0.49	^(c)		0.02	^(c)
Year ended 08/31/10		1.00		0.00	^(b)		0.00			0.00		(0.00	)		—			(0.00	)		1.00		0.03			43,656		0.29			0.49			0.03
Year ended 08/31/09		1.00		0.01	^(b)		(0.00	)		0.01		(0.01	)		—			(0.01	)		1.00		0.77			129,078		0.41			0.51			0.90
Five months ended 08/31/08		1.00		0.01	^(b)		0.00			0.01		(0.01	)		—			(0.01	)		1.00		0.66			261,498		0.38	^(d)		0.45	^(d)		1.60	^(d)
Year ended 03/31/08		1.00		0.03			(0.00	)		0.03		(0.03	)		—			(0.03	)		1.00		3.11			242,372		0.38			0.45			3.07
Year ended 03/31/07		1.00		0.03			—			0.03		(0.03	)		—			(0.03	)		1.00		3.24			381,047		0.38			0.45			3.20


(a)		Includes adjustments in accordance with accounting principles generally accepted in the United States of America.
(b)		Calculated using average shares outstanding.
(c)		Ratios are based on average daily net assets (000’s) of $220,472, $103,173, $327,159, $268,327, $13,335 and $32,688 for Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio, and Tax-Free Cash Reserve Portfolio, respectively.
(d)		Annualized.

19 Short-Term Investment Trust


	n	You invest $10,000 in the Fund and hold it for the entire 10-year period; and


	n	Your investment has a 5% return before expenses each year.



Liquid Assets Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.34%		0	.37%		0	.37%		0	.37%		0	.37%		0	.37%		0	.37%		0	.37%		0	.37%		0	.37%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.66%		9	.51%		14	.58%		19	.88%		25	.43%		31	.24%		37	.32%		43	.67%		50	.32%		57	.28%
End of Year Balance	$	10,466	.00	$	10,950	.58	$	11,457	.59	$	11,988	.07	$	12,543	.12	$	13,123	.87	$	13,731	.50	$	14,367	.27	$	15,032	.48	$	15,728	.48
Estimated Annual Expenses	$	34	.79	$	39	.62	$	41	.46	$	43	.37	$	45	.38	$	47	.48	$	49	.68	$	51	.98	$	54	.39	$	56	.91

STIC Prime Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.30%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%		0	.39%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.70%		9	.53%		14	.58%		19	.86%		25	.38%		31	.16%		37	.21%		43	.54%		50	.15%		57	.07%
End of Year Balance	$	10,470	.00	$	10,952	.67	$	11,457	.58	$	11,985	.78	$	12,538	.32	$	13,116	.34	$	13,721	.00	$	14,353	.54	$	15,015	.24	$	15,707	.44
Estimated Annual Expenses	$	30	.71	$	41	.77	$	43	.70	$	45	.71	$	47	.82	$	50	.03	$	52	.33	$	54	.75	$	57	.27	$	59	.91

Treasury Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.30%		0	.38%		0	.38%		0	.38%		0	.38%		0	.38%		0	.38%		0	.38%		0	.38%		0	.38%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.70%		9	.54%		14	.60%		19	.89%		25	.43%		31	.23%		37	.29%		43	.63%		50	.27%		57	.21%
End of Year Balance	$	10,470	.00	$	10,953	.71	$	11,459	.78	$	11,989	.22	$	12,543	.12	$	13,122	.61	$	13,728	.88	$	14,363	.15	$	15,026	.73	$	15,720	.96
Estimated Annual Expenses	$	30	.71	$	40	.71	$	42	.59	$	44	.55	$	46	.61	$	48	.76	$	51	.02	$	53	.37	$	55	.84	$	58	.42

Government & Agency Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.29%		0	.33%		0	.33%		0	.33%		0	.33%		0	.33%		0	.33%		0	.33%		0	.33%		0	.33%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.71%		9	.60%		14	.72%		20	.08%		25	.68%		31	.55%		37	.70%		44	.13%		50	.86%		57	.90%
End of Year Balance	$	10,471	.00	$	10,960	.00	$	11,471	.83	$	12,007	.56	$	12,568	.31	$	13,155	.26	$	13,769	.61	$	14,412	.65	$	15,085	.72	$	15,790	.22
Estimated Annual Expenses	$	29	.68	$	35	.36	$	37	.01	$	38	.74	$	40	.55	$	42	.44	$	44	.43	$	46	.50	$	48	.67	$	50	.95

Government TaxAdvantage Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.30%		0	.46%		0	.46%		0	.46%		0	.46%		0	.46%		0	.46%		0	.46%		0	.46%		0	.46%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.70%		9	.45%		14	.42%		19	.62%		25	.05%		30	.73%		36	.66%		42	.86%		49	.35%		56	.13%
End of Year Balance	$	10,470	.00	$	10,945	.34	$	11,442	.26	$	11,961	.73	$	12,504	.80	$	13,072	.52	$	13,666	.01	$	14,286	.44	$	14,935	.05	$	15,613	.10
Estimated Annual Expenses	$	30	.71	$	49	.26	$	51	.49	$	53	.83	$	56	.27	$	58	.83	$	61	.50	$	64	.29	$	67	.21	$	70	.26

Tax-Free Cash Reserve Portfolio — RESOURCE CLASS	Year 1			Year 2			Year 3			Year 4			Year 5			Year 6			Year 7			Year 8			Year 9			Year 10


Annual Expense Ratio ¹		0	.41%		0	.49%		0	.49%		0	.49%		0	.49%		0	.49%		0	.49%		0	.49%		0	.49%		0	.49%
Cumulative Return Before Expenses		5	.00%		10	.25%		15	.76%		21	.55%		27	.63%		34	.01%		40	.71%		47	.75%		55	.13%		62	.89%
Cumulative Return After Expenses		4	.59%		9	.31%		14	.24%		19	.39%		24	.77%		30	.40%		36	.28%		42	.43%		48	.85%		55	.56%
End of Year Balance	$	10,459	.00	$	10,930	.70	$	11,423	.68	$	11,938	.88	$	12,477	.33	$	13,040	.05	$	13,628	.16	$	14,242	.79	$	14,885	.14	$	15,556	.46
Estimated Annual Expenses	$	41	.94	$	52	.40	$	54	.77	$	57	.24	$	59	.82	$	62	.52	$	65	.34	$	68	.28	$	71	.36	$	74	.58


1 Your actual expenses may be higher or lower than those shown.

20 Short-Term Investment Trust

Distribution and Service (12b-1) Fees

Purchasing Shares

Minimum Investments Per Fund Account

The minimum investments for Resource Class accounts are as follows:



	Initial		Additional
Class	Investments*		Investments

Resource Class	$	1,000,000		No minimum


*		An intermediary may aggregate its master accounts and subaccounts to satisfy the minimum investment requirement.

How to Purchase Shares

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

You may purchase shares using one of the options below. Unless the Fund closes early on a business day, the transfer agent will generally accept any purchase order placed until 3:00 p.m. Eastern Time on a business day and may accept a purchase order placed until 3:30 p.m. Eastern Time on a business day. If you wish to place an order between 3:00 p.m. and 3:30 p.m. Eastern Time on a business day, you must place such order by telephone; or send your request by a pre-arranged Liquidity LINK data transmission however, the transfer agent reserves the right to reject or limit the amount of orders placed during this time. If the Fund closes early on a business day, the transfer agent must receive your purchase order prior to such closing time. Purchase orders will not be processed unless the account application and purchase payment are received in good order. In accordance with the USA PATRIOT Act, if you fail to provide all the required information requested in the current account application, your purchase order will not be processed. Additionally, Federal law requires that the Invesco Fund verify and record your identifying information.


Purchase Options
	Opening An Account	Adding To An Account

Through a Financial Intermediary	Contact your financial intermediary	Same
	The financial intermediary should forward your completed account application to the transfer agent,
	Invesco Investment Services, Inc. P.O. Box 219286 Kansas City, MO 64121-9286
	The financial intermediary should call the transfer agent at (800) 659-1005 to receive an account number.
	The intermediary should use the following wire instructions:
	The Bank of New York ABA/Routing #: 021000018 DDA: 8900118377 Invesco Investment Services, Inc.
	For Further Credit to Your Account #
	If you do not know your account # or settle on behalf of multiple accounts, please contact the transfer agent for assistance.

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MCF—12/11


Purchase Options
	Opening An Account	Adding To An Account

By Telephone	Open your account as described above.	Call the transfer agent at (800) 659-1005 and wire payment for your purchase order in accordance with the wire instructions noted above.
By Liquidity LINK ^®	Open your account as described above.	Complete an Liquidity LINK ^® Agreement. Mail the application and agreement to the transfer agent. Once your request for this option has been processed, you may place your order via Liquidity LINK.

Automatic Dividend and Distribution Investment

Redeeming Shares

Redemption Fees

We will not charge you any fees to redeem your shares. Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares


Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 5:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 5:00 p.m. Eastern Time and 5:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 5:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 5:00 p.m. Eastern Time on a business day to effect the transaction on that day.


STIC Prime Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 4:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 4:00 p.m. Eastern Time and 4:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 4:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 4:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Government TaxAdvantage Portfolio

Through a Financial Intermediary		If placing a redemption request through your financial intermediary, redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time on a business day in order to effect the redemption on that day. If the financial intermediary wishes to place a redemption order between 3:00 p.m. Eastern Time and 3:30 p.m. Eastern Time on a business day it must do so by telephone.
By Telephone		If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the transfer agent before 3:30 p.m. Eastern Time on a business day to effect the redemption transaction on that day.
By Liquidity LINK ^®		If placing a redemption request through Liquidity LINK, the transfer agent must receive your redemption request before 3:00 p.m. Eastern Time on a business day to effect the transaction on that day.


Tax-Free Cash Reserve Portfolio

Through a Financial Intermediary		Contact your financial intermediary. Redemption proceeds will be transmitted electronically to your pre-authorized bank account. The transfer agent must receive your financial intermediary’s instructions before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Telephone		A person who has been authorized to make transactions in the account application may make redemptions by telephone. You must call the transfer agent before 3:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price.
By Liquidity LINK ^®		If you place your redemption request via Liquidity LINK, the transfer agent must generally receive your redemption request before 12:30 p.m. Eastern Time in order to effect the redemption at that day’s closing price. Redemption orders of shares placed between 12:30 and 3:30 p.m. Eastern Time must be transmitted by telephone or a pre-arranged data transmission.

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the transfer agent receives a redemption order.

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

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STIC Prime Portfolio

Government TaxAdvantage Portfolio

Tax-Free Cash Reserve Portfolio

We will normally wire payment for redemptions received prior to 3:30 p.m. Eastern Time on the same day. However, depending on such factors as market liquidity and the size of redemption, for a redemption request received by the transfer agent between 12:30 p.m. Eastern Time and 3:30 p.m. Eastern Time, proceeds may not be wired until the next business day. If the transfer agent receives a redemption request on a business day after 3:30 p.m. Eastern Time, the redemption will be effected at the net asset value of the Fund determined on the next business day, and the transfer agent will normally wire redemption proceeds on such next business day.

If proceeds are not wired on the same day, shareholders will normally accrue dividends until the day the proceeds are wired. Dividends payable up to the date of redemption on redeemed shares will normally be paid on the next dividend payment date. However, if all of the shares in your account were redeemed from an individual account or from an aggregate account, you may request that dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

Redemptions by Liquidity LINK

If you redeem via Liquidity LINK, we will transmit your redemption proceeds electronically to your pre-authorized bank account. We are not liable for Liquidity LINK instructions that are not genuine.

Redemptions by the Funds

Each Fund and its agent reserve the right at any time to:


n	reject or cancel all or any part of any purchase order;
n	modify any terms or conditions of purchase of shares of any fund; or
n	suspend, change or withdraw all or any part of the offering made by this prospectus.

Pricing of Shares

Determination of Net Asset Value

Liquid Assets Portfolio, Treasury Portfolio and Government & Agency Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 5:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

STIC Prime Portfolio

The price of the Fund’s shares is the Fund’s net asset value per share. The Fund will generally determine the net asset value of its shares at 4:30 p.m. Eastern Time.

If the Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Each Fund will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time.

If a Fund closes early on a business day, as described below under “Pricing of Shares—Timing of Orders”, the Fund will calculate its net asset value as of the time of such closing.

Each Fund values portfolio securities on the basis of amortized cost, which approximates market value. This method of valuation is designed to

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enable a Fund to price its shares at $1.00 per share. The Funds cannot guarantee their net asset value will always remain at $1.00 per share.

Timing of Orders

Each Fund may postpone the right of redemption under unusual circumstances, as allowed by the SEC, such as when the New York Stock Exchange restricts or suspends trading.

Each Fund reserves the right to change the time for which purchase and redemption orders must be submitted to and received by the transfer agent for execution on the same day.

Frequent Purchases and Redemptions of Fund Shares


n	Each Fund is offered to investors as a cash management vehicle. Investors must perceive an investment in such Fund as an alternative to cash, and must be able to purchase and redeem shares regularly and frequently.
n	One of the advantages of a money market Fund as compared to other investment options is liquidity. Any policy that diminishes the liquidity of a Fund will be detrimental to the continuing operations of the Fund.
n	Each Fund’s portfolio securities are valued on the basis of amortized cost, and the Fund seeks to maintain a constant net asset value. As a result, there are no price arbitrage opportunities.
n	Because each Fund seeks to maintain a constant net asset value, investors expect to receive upon redemption the amount they originally invested in the Fund. Imposition of redemption fees would run contrary to investor expectations.

Taxes

Liquid Assets Portfolio, STIC Prime Portfolio, Treasury Portfolio, Government & Agency Portfolio, Government TaxAdvantage Portfolio and Tax-Free Cash Reserve Portfolio


n	A Fund earns income generally in the form of interest on its investments. This income, less expenses incurred in the operation of a Fund, constitutes the Fund’s net investment income from which dividends may be paid to you. If you are a taxable investor, distributions of net investment income are generally taxable to you as ordinary income.
n	Distributions of net short-term capital gains are taxable to you as ordinary income. Because a Fund is a money market fund, it does not anticipate realizing any long-term capital gains.
n	None of the dividends paid by a Fund will qualify for the dividends received deduction in the case of corporate shareholders or as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
n	Distributions declared to shareholders with a record date in December—if paid to you by the end of January—are taxable for federal income tax purposes as if received in December.
n	Any capital gains realized from redemptions of Fund shares will be subject to federal income tax. For tax purposes, an exchange of your shares for shares of another Fund is the same as a sale. Because a Fund expects to maintain a stable net asset value of $1.00 per share, investors should not have any gain or loss on sale or exchange of Fund shares.


n	You will not be required to include the portion of dividends paid by a Fund derived from interest on U.S. government obligations in your gross income for purposes of personal and, in some cases, corporate income taxes in many state and local tax jurisdictions. The percentage of dividends that constitutes dividends derived from interest on federal obligations will be determined annually. This percentage may differ from the actual percentage of interest received by the Fund on federal obligations for the particular days on which you hold shares.
n	Fund distributions generally are subject to state and local income taxes.
n	Foreign investors should be aware that U.S. withholding, special certification requirements to avoid U.S. backup withholding and claim any treaty benefits and estate taxes may apply to an investment in a Fund.

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Tax-Free Cash Reserve Portfolio


n	A Fund may invest in municipal securities the interest on which constitutes an item of tax preference and could give rise to a federal alternative minimum tax liability for you. However, under recently enacted provisions of the American Recovery and Reinvestment Act of 2009, tax exempt interest on such municipal securities issued in 2009 and 2010 is not an item of tax preference for purposes of the alternative minimum tax.
n	Exempt-interest dividends from interest earned on municipal securities of a state, or its political subdivisions, generally are exempt from that state’s personal income tax. Most states, however, do not grant tax-free treatment to interest from municipal securities of other states.
n	A Fund may invest a portion of its assets in securities that pay income that is not tax-exempt. To the extent that dividends paid by a Fund are derived from taxable investments or realized capital gains, they will be taxable as ordinary income or long-term capital gains.
n	A Fund may distribute to you any market discount and net short-term capital gains from the sale of its portfolio securities. If you are a taxable investor, Fund distributions from this income are taxable to you as ordinary income, and generally will neither qualify for the dividends received deduction in the case of corporate shareholders nor as qualified dividend income subject to reduced rates of taxation in the case of noncorporate shareholders.
n	Exempt-interest dividends from a Fund are taken into account when determining the taxable portion of your social security or railroad retirement benefits, may be subject to state and local income taxes, may affect the deductibility of interest on certain indebtedness, and may have other collateral federal income tax consequences for you.

Important Notice Regarding Delivery of Security Holder Documents

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