Prospectus

December 15, 2017

Institutional Money Market Funds

Invesco Liquid Assets Portfolio  (LPMXX)

Invesco STIC Prime Portfolio  (SCNXX)

Government Money Market Funds

Invesco Treasury Portfolio

Invesco Government & Agency Portfolio

Invesco Treasury Obligations Portfolio  

Retail Money Market Fund

Invesco Tax-Free Cash Reserve Portfolio

Cash Management Classes

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

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

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

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

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

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

As with all other mutual fund securities, the U.S. Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

You could lose money by investing in each Fund. An investment in each Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Each Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. Investments in each Fund are not guaranteed by a bank and investment is not a bank deposit.

Table of Contents

Fund Summaries	1
Invesco Liquid Assets Portfolio	1
Invesco STIC Prime Portfolio	3
Invesco Treasury Portfolio	5
Invesco Government & Agency Portfolio	7
Invesco Treasury Obligations Portfolio	8
Invesco Tax-Free Cash Reserve Portfolio	10
Investment Objective(s), Strategies, Risks and Portfolio Holdings	12
Invesco Liquid Assets Portfolio	12
Invesco STIC Prime Portfolio	14
Invesco Treasury Portfolio	15
Invesco Government & Agency Portfolio	16
Invesco Treasury Obligations Portfolio	18
Invesco Tax-Free Cash Reserve Portfolio	19
Fund Management	20
The Adviser(s)	20
Adviser Compensation	20
Other Information	21
Dividends and Distributions	21
Financial Highlights	22
Hypothetical Investment and Expense Information	23
Shareholder Account Information	A-1
Purchasing Shares	A-1
Redeeming Shares	A-2
Pricing of Shares	A-4
Frequent Purchases and Redemptions of Fund Shares	A-5
Taxes	A-6
Important Notice Regarding Delivery of Security Holder Documents	A-7
Obtaining Additional Information Back Cover

                                   Short-Term Investment Trust

Fund Summaries

Invesco 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.

    

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	0.08
Other Expenses	0.11
Total Annual Fund Operating Expenses	0.34
Fee Waiver and/or Expense Reimbursement 1	0.08
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.26

1

Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed to waive advisory fees and/or reimburse expenses 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 0.26%, of the Fund's average daily net assets (the “expense limit”). Unless Invesco continues the fee waiver agreement, it will terminate on December 31, 2018. During its term, the fee waiver agreement cannot be terminated or amended to increase the expense limit without approval of the Board of Trustees.

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$27	$101	$183	$423

Principal Investment Strategies of the Fund

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of

comparable quality. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current net asset value (NAV) per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities. The Fund invests in conformity with U.S. Securities 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 calendar 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 calendar days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), of no more than 120 calendar days. Each investment must be determined to present minimal credit risks by Invesco Advisers, Inc. (Invesco or the Adviser) pursuant to guidelines approved by the Fund’s Board of Trustees (the Board), and must be an Eligible Security.

The Fund may invest up to 50% of its total assets in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 or any other government agency. 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:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly), the supply of short-term financing, changes in government regulation, changes in interest rates, and economic downturns in the United States and abroad.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on

longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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. The Fund is subject to the risk that the counterparty may default on its obligation to repurchase the underlying instruments collateralizing the repurchase agreement, which may cause the Fund to lose money. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco STIC Prime Portfolio

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	$27	$103	$187	$434

Principal Investment Strategies of the Fund

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of comparable quality.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current net asset value (NAV) per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities.

The Fund invests in conformity with U.S. Securities 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 60 calendar 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 calendar days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), of no more than 60 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

The Fund may invest in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 or any other government agency. 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:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these

instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly), the supply of short-term financing, changes in government regulation, changes in interest rates, and economic downturns in the United States and abroad.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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. The Fund is subject to the risk that the counterparty may default on its obligation to repurchase the underlying instruments collateralizing the repurchase agreement, which may cause the Fund to lose money. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Treasury Portfolio

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$27	$88	$155	$354

Principal Investment Strategies of the Fund

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), 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 U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes

the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could

absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Government & Agency Portfolio

and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the

sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Treasury Obligations Portfolio

periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$27	$92	$165	$377

Principal Investment Strategies of the Fund

The Fund invests at least 99.5% of its total assets in cash and Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government. At the present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 Government Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7),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 U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board of Trustees, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest

rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Tax-Free Cash Reserve Portfolio

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.

    

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Class:	Cash Management
Management Fees	0.20%
Distribution and/or Service (12b-1) Fees	0.08
Other Expenses	0.17
Total Annual Fund Operating Expenses	0.45
Fee Waiver and/or Expense Reimbursement 1	0.17
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 to waive advisory fees and/or reimburse expenses 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 0.28%,of the Fund's average daily net assets (the “expense limit”). Unless Invesco continues the fee waiver agreement, it will terminate on December 31, 2018. During its term, the fee waiver agreement cannot be terminated or amended to increase the expense limit without approval of the Board of Trustees.

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$29	$127	$235	$550

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 that (i) pay interest that is excluded from gross income for federal income tax purposes, and (ii) do not produce income that will be considered to be an item of preference for purposes of the alternative minimum tax. While the Fund’s distributions are primarily exempt from federal income tax, a portion of the Fund’s distributions may be subject to the federal alternative minimum tax and state and local taxes.

In complying with the 80% investment requirement, the Fund may include other instruments that have economic characteristics similar to the Fund's direct investments that are counted toward the 80% investment requirement.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 (which include tender option bonds and variable rate instruments which are created when fixed rate bonds are coupled with a third-party demand feature) and certain types of industrial revenue bonds 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 intends to qualify as a Retail Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), 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. Retail Money Market Funds may be beneficially owned only by natural persons, as determined in the “Shareholder Account Information – Purchase Shares” section of this Prospectus. The Fund invests in conformity with U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure. The Fund may also invest in daily and weekly variable-rate demand notes.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly). Financial services companies may be dependent on the supply of short-term financing. The value of bank instruments and securities of issuers in the banking and financial services industry, or guaranteed by such issuers, can be affected by and sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad. The risk of holding bank instruments is also directly tied to the risk of insolvency or bankruptcy of the issuing banks, which risk may be higher for larger or more complex financial institutions that combine traditional, commercial and investment banking.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee

that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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 defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could

affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco STIC Prime 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 without shareholder approval.

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of comparable quality.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current NAV per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities. 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 60 calendar 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 calendar 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 60 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

The Fund may invest in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of

Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly). Financial services companies may be dependent on the supply of short-term financing. The value of bank instruments and securities of issuers in the banking and financial services industry, or guaranteed by such issuers, can be affected by and sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad. The risk of holding bank instruments is also directly tied to the risk of insolvency or bankruptcy of the issuing banks, which risk may be higher for larger or more complex financial institutions that combine traditional, commercial and investment banking.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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 defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Treasury 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 without shareholder approval.

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund as defined by Rule 2a-7. As permitted by 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry.

Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Government & Agency 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 without shareholder approval.

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested, under normal circumstances, 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, as well as repurchase agreements secured by those obligations. Direct obligations of the U.S. Treasury generally include bills, notes and bonds. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund as defined by Rule 2a-7. As permitted by 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience

losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Treasury Obligations Portfolio

interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco 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 without shareholder approval.

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in debt securities that (i) pay interest that is excluded from gross income for federal income tax purposes, and (ii) do not produce income that will be considered to be an item of preference for purposes of the alternative minimum tax. While the Fund’s distributions are primarily exempt from federal income tax, a portion of the Fund’s distributions may be subject to the federal alternative minimum tax and state and local taxes.

In complying with the 80% investment requirement, the Fund may include other instruments that have economic characteristics similar to the Fund's direct investments that are counted toward the 80% investment requirement.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 include tender option bonds and variable rate instruments, which are created when fixed rate bonds are coupled with a third-party demand feature) and certain types of industrial revenue bonds 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 intends to qualify as a Retail Money Market Fund, as defined by Rule 2a-7, 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. Retail Money Market Funds may be beneficially owned only by natural persons, as determined in the “Shareholder Account Information – Purchasing Shares” section of this Prospectus. 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 calendar 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 calendar 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 calendar days. Each investment must

be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Portfolio Holdings

Information concerning the Funds' portfolio holdings as well as their dollar-weighted average portfolio maturity and dollar-weighted average life to maturity as of the last business day or subsequent calendar day of the preceding month will be posted on their Web site no later than five business days after the end of the month and remain posted on the Web site for six months thereafter.

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.

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 about these types of payments.

A discussion regarding the basis for the Board’s 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.

Other Information

    

21                                   Short-Term Investment Trust

 

Cash Management Class

	Net asset value, beginning of period	Net investment income (a)	Net gains (losses) on securities (both realized and unrealized)	Total from investment operations	Dividends from net investment income	Distributions from net realized gains	Total distributions	Net asset value, end of period	Total return (b)	Net assets, end of period (000’s omitted)	Ratio of expenses to average net assets with fee waivers and/or expense reimbursements	Ratio of expenses to average net assets without fee waivers and/or expense reimbursements	Ratio of net investment income to average net assets
Invesco Liquid Assets Portfolio
Year ended 08/31/17	$1.00	$0.0043	$0.0036	$0.0079	$(0.0072)	$(0.0005)	$(0.0077)	$1.0002	0.76%	$ 7,738	0.26% (c)	0.34% (c)	0.43% (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.25	250,643	0.23	0.28	0.26
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	458,001	0.20	0.27	0.02
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	684,446	0.19	0.27	0.02
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.05	744,301	0.21	0.27	0.05
Invesco STIC Prime Portfolio
Year ended 08/31/17	1.00	0.0054	0.0007	0.0061	(0.0061)	—	(0.0061)	1.0000	0.62	1,148	0.26 (c)	0.35 (c)	0.54 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.20	167,872	0.19	0.30	0.21
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.04	483,595	0.07	0.29	0.10
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.08	453,771	0.06	0.29	0.08
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.06	451,190	0.11	0.29	0.08
Invesco Treasury Portfolio
Year ended 08/31/17	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.44	479,400	0.26 (c)	0.28 (c)	0.44 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.10	403,424	0.19	0.28	0.12
Year ended 08/31/15	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.01	5,304,331	0.06	0.27	0.02
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.01	7,597,812	0.04	0.27	0.02
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	(0.00)	(0.00)	1.00	0.02	6,226,819	0.09	0.28	0.02
Invesco Government & Agency Portfolio
Year ended 08/31/17	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.48	169,027	0.23 (c)	0.23 (c)	0.50 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.13	150,104	0.18	0.24	0.15
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	222,853	0.08	0.23	0.02
Year ended 08/31/14	1.00	0.00	—	0.00	(0.00)	—	(0.00)	1.00	0.02	469,858	0.06	0.23	0.02
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	(0.00)	(0.00)	1.00	0.03	635,001	0.11	0.24	0.02
Invesco Treasury Obligations Portfolio
Year ended 08/31/17	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.38	1,618	0.24 (c)	0.30 (c)	0.42 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.09	31,390	0.16	0.46	0.09
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	45,026	0.00	0.43	0.08
Year ended 08/31/14	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.04	48,104	0.02	0.39	0.03
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.03	31,553	0.06	0.30	0.03
Invesco Tax-Free Cash Reserve Portfolio
Year ended 08/31/17	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.49	27,616	0.28 (c)	0.45 (c)	0.48 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.07	30,671	0.13	0.41	0.09
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.01	51,018	0.03	0.41	0.04
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.05	60,722	0.04	0.40	0.04
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.06	107,926	0.10	0.40	0.06

(a)	Calculated using average shares outstanding.

(b)	Includes adjustments in accordance with accounting principles generally accepted in the United States of America and is not annualized for periods less than one year.
(c)	Ratios are based on average daily net assets (000’s omitted) of $35,080, $18,306, $392,165, $144,562, $2,026 and $34,231 for Invesco Liquid Assets Portfolio, Invesco STIC Prime Portfolio, Invesco Treasury Portfolio, Invesco Government & Agency Portfolio, Invesco Treasury Obligations Portfolio and Invesco Tax-Free Cash Reserve Portfolio, respectively.

22                                   Short-Term Investment Trust

Hypothetical Investment and Expense Information

    

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 each Fund’s expenses, including investment advisory fees and other Fund costs, on each Fund’s returns over a 10-year period. The example reflects the following:

■	You invest $10,000 in the Fund and hold it for the entire 10-year period;
■	Your investment has a 5% return before expenses each year; and

■

Invesco Liquid Assets Portfolio, Invesco STIC Prime Portfolio, Invesco Treasury Portfolio, Invesco Treasury Obligations Portfolio and Invesco Tax-Free Cash Reserve Portfolio’s current annual expense ratio includes any applicable contractual fee waiver or expense reimbursement for the period committed.

There is no assurance that the annual expense ratio will be the expense ratio for the Funds’ 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.

Invesco 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	0.26%	0.34%	0.34%	0.34%	0.34%	0.34%	0.34%	0.34%	0.34%	0.34%
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	4.74%	9.62%	14.73%	20.08%	25.67%	31.53%	37.66%	44.07%	50.79%	57.81%
End of Year Balance	$10,474.00	$10,962.09	$11,472.92	$12,007.56	$12,567.11	$13,152.74	$13,765.66	$14,407.14	$15,078.51	$15,781.17
Estimated Annual Expenses	$ 26.62	$ 36.44	$ 38.14	$ 39.92	$ 41.78	$ 43.72	$ 45.76	$ 47.89	$ 50.13	$ 52.46

    

Invesco 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	0.26%	0.35%	0.35%	0.35%	0.35%	0.35%	0.35%	0.35%	0.35%	0.35%
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	4.74%	9.61%	14.71%	20.04%	25.62%	31.46%	37.58%	43.98%	50.67%	57.68%
End of Year Balance	$10,474.00	$10,961.04	$11,470.73	$12,004.12	$12,562.31	$13,146.46	$13,757.77	$14,397.50	$15,066.99	$15,767.60
Estimated Annual Expenses	$ 26.62	$ 37.51	$ 39.26	$ 41.08	$ 42.99	$ 44.99	$ 47.08	$ 49.27	$ 51.56	$ 53.96

    

Invesco 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	0.26%	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	4.74%	9.68%	14.86%	20.28%	25.96%	31.90%	38.13%	44.65%	51.48%	58.63%
End of Year Balance	$10,474.00	$10,968.37	$11,486.08	$12,028.22	$12,595.96	$13,190.48	$13,813.08	$14,465.05	$15,147.80	$15,862.78
Estimated Annual Expenses	$ 26.62	$ 30.02	$ 31.44	$ 32.92	$ 34.47	$ 36.10	$ 37.80	$ 39.59	$ 41.46	$ 43.41

    

Invesco 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	0.23%	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	4.77%	9.77%	15.00%	20.49%	26.24%	32.26%	38.57%	45.18%	52.10%	59.36%
End of Year Balance	$10,477.00	$10,976.75	$11,500.34	$12,048.91	$12,623.64	$13,225.79	$13,856.66	$14,517.62	$15,210.11	$15,935.64
Estimated Annual Expenses	$ 23.55	$ 24.67	$ 25.85	$ 27.08	$ 28.37	$ 29.73	$ 31.14	$ 32.63	$ 34.19	$ 35.82

    

Invesco Treasury Obligations 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	0.26%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%
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	4.74%	9.66%	14.82%	20.21%	25.86%	31.78%	37.97%	44.46%	51.25%	58.36%
End of Year Balance	$10,474.00	$10,966.28	$11,481.69	$12,021.33	$12,586.34	$13,177.89	$13,797.25	$14,445.72	$15,124.67	$15,835.53
Estimated Annual Expenses	$ 26.62	$ 32.16	$ 33.67	$ 35.25	$ 36.91	$ 38.65	$ 40.46	$ 42.36	$ 44.36	$ 46.44

    

Invesco 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	0.28%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%	0.45%
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%	9.48%	14.47%	19.67%	25.12%	30.81%	36.76%	42.99%	49.49%	56.30%
End of Year Balance	$10,472.00	$10,948.48	$11,446.63	$11,967.45	$12,511.97	$13,081.27	$13,676.46	$14,298.74	$14,949.34	$15,629.53
Estimated Annual Expenses	$ 28.66	$ 48.20	$ 50.39	$ 52.68	$ 55.08	$ 57.58	$ 60.20	$ 62.94	$ 65.81	$ 68.80

23                                   Short-Term Investment Trust

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Purchase Options
	Opening An Account	Adding To An Account
By Telephone	Open your account as described above.	Call the Funds’ 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 a Liquidity Link Agreement. Mail the application and agreement to the Funds’ 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 reinvested 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

Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares

Invesco Treasury Portfolio and Invesco 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 Funds’ 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 Funds’ 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 Funds’ 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.

    

Invesco Liquid Assets Portfolio and Invesco 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 Funds’ transfer agent must receive your financial intermediary’s instructions before 3:00 p.m. Eastern Time on a business day in order to effect the redemption on that day.
By Telephone	If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the Funds’ transfer agent before 3:00 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 Funds’ 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.

    

    

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the Funds’ transfer agent receives a redemption request in good order.

Invesco Treasury Portfolio and Invesco Government & Agency Portfolio

For Invesco Treasury Portfolio and Invesco Government & Agency Portfolio, the Funds’ transfer agent will normally wire payment for redemptions received prior to 5:30 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, for a redemption request received by the Funds’ 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 Funds’ 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 Funds’ transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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, the Fund may not provide same day settlement of redemption orders.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio

For Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, the Funds’ transfer agent will normally wire payment for redemptions received prior to 3:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, proceeds may not be wired until the next business day. If the Funds’ transfer agent receives a redemption request on a business day after 3:00 p.m. Eastern Time (for Invesco Liquid Assets Portfolio 8:00 a.m., 12:00 p.m. and 3:00 p.m. Eastern time), the redemption will be effected at the net asset value of each Fund next determined, which may be on the next business day, and the Funds’ transfer agent will normally wire redemption proceeds on such next business day,

and in any event no more than seven days, after your redemption request is received in good order.

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, the Fund may not provide same day settlement of redemption orders.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Treasury Obligations Portfolio

The Fund’s transfer agent will normally wire payment for redemptions received prior to 3:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, for a redemption request received by the Fund’s transfer agent between 2:30 p.m. Eastern Time and 3:00 p.m. Eastern Time, proceeds may not be wired until the next business day. If the Fund’s transfer agent receives a redemption request on a business day after 3:00 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 Fund’s transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Tax-Free Cash Reserve Portfolio

The Fund’s transfer agent will normally wire payment for redemptions received prior to 4:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. If the Fund’s transfer agent receives a redemption request on a business day after 4:00 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 Fund’s transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

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

Redemptions by Liquidity Link

If you redeem via Liquidity Link, the Funds’ transfer agent will transmit your redemption proceeds electronically to your pre-authorized bank account. The Funds and the Funds’ transfer agent are not liable for Liquidity Link instructions that are not genuine.

Suspension of Redemptions

In the event that a Fund, at the end of a business day, has invested less than 10% of its total assets in weekly liquid assets or the Fund’s price per share as computed for the purpose of distribution, redemption and repurchase, rounded to the nearest 1%, has deviated from the stable price established by the Fund’s Board of Trustees (“Board”) or the Board, including a majority of trustees who are not interested persons as defined in the 1940 Act, determines that such a deviation is likely to occur, and the Board, including a majority of trustees who are not interested persons of the Fund, irrevocably has approved the liquidation of the Fund, the Fund’s Board has the authority to suspend redemptions of Fund shares.

Liquidity Fees and Redemption Gates

For Invesco Tax-Free Cash Reserve Portfolio, Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, if the Fund’s weekly liquid assets fall below 30% of its total assets, the Board, in its discretion, may impose liquidity fees of up to 2% of the value of the shares redeemed and/or suspend redemptions (redemption gates). In addition, if any such Fund’s weekly liquid assets falls below 10% of its total assets at the end of any business day, the Fund must impose a 1% liquidity fee on shareholder redemptions unless the Board determines that not doing so is in the best interests of the Fund.

Liquidity fees and redemption gates are most likely to be imposed, if at all, during times of extraordinary market stress. In the event that a liquidity fee or redemption gate is imposed, the Board expects that for the duration of its implementation and the day after which such gate or fee is terminated, the Fund would strike only one net asset value per day, at the Fund’s last scheduled net asset value calculation time.

The imposition and termination of a liquidity fee or redemption gate will be reported by a Fund to the SEC on Form N-CR. Such information will also be available on the Fund’s Web site. In addition, a Fund will communicate such action through a supplement to its registration statement and may further communicate such action through a press release or by other means. If a liquidity fee is applied by the Board, it will be charged on all redemption orders submitted after the effective time of the imposition of the fee by the Board. Liquidity fees would reduce the amount you receive upon redemption of your shares. In the event a Fund imposes a redemption gate, the Fund or any financial intermediary on its behalf will not accept redemption requests until the Fund provides notice that the redemption gate has been terminated.

Redemption requests submitted while a redemption gate is imposed will be cancelled without further notice. If shareholders still wish to redeem their shares after a redemption gate has been lifted, they will need to submit a new redemption request.

Liquidity fees and redemption gates will generally be used to assist a Fund to help preserve its market–based NAV per share. It is possible that a liquidity fee will be returned to shareholders in the form of a distribution. The Board may, in its discretion, terminate a liquidity fee or redemption gate at any time if it believes such action to be in the best interest of a Fund. Also, liquidity fees and redemption gates will automatically terminate at the beginning of the next business day once a Fund’s weekly liquid assets reach at least 30% of its total assets. Redemption gates may only last up to 10 business days in any 90-day period. When a fee or a gate is in place, the Fund may elect not to permit the purchase of shares or to subject the purchase of shares to certain conditions, which may include affirmation of the purchaser’s knowledge that a fee or a gate is in effect. When a fee or a gate is in place, shareholders will not be permitted to exchange into or out of a Fund.

There is some degree of uncertainty with respect to the tax treatment of liquidity fees received by a Fund, and such tax treatment may be the subject to future IRS guidance. If a Fund receives liquidity fees, it will consider the appropriate tax treatment of such fees to the Fund at such time.

Financial intermediaries are required to promptly take the steps requested by the Funds or their designees to impose or help to implement a liquidity fee or redemption gate as requested from time to time, including the rejection of orders due to the imposition of a fee or gate or the prompt re-confirmation of orders following a notification regarding the implementation of a fee or gate. If a liquidity fee is imposed, these steps are expected to include the submission of separate, rather than combined, purchase and redemption orders from the time of the effectiveness of the liquidity fee or redemption gate and the submission of such order information to the Fund or its designee prior to the next calculation of a Fund’s net asset value. Unless otherwise agreed to between a Fund and financial intermediary, the Fund will withhold liquidity fees on behalf of financial intermediaries. With regard to such orders, a redemption request that a Fund determines in its sole discretion has been received in good order by the Fund or its designated agent prior to the imposition of a liquidity fee or redemption gate may be paid by the Fund despite the imposition of a redemption gate or without the deduction of a liquidity fee. If a liquidity fee is imposed during the day, an intermediary who receives both purchase and redemption orders from a single account holder is not required to net the purchase and redemption orders. However, the intermediary is permitted to apply the liquidity fee to the net amount of redemptions (even if the purchase order was received prior to the time the liquidity fee was imposed).

Where a Financial Intermediary serves as a Fund’s agent for the purpose of receiving orders, trades that are not transmitted to the Fund by the Financial Intermediary before the time required by the Fund or the transfer agent may, in the Fund’s discretion, be processed on an as-of basis, and any cost or loss to the Fund or transfer agent or their affiliates, from such transactions shall be borne exclusively by the Financial Intermediary.

Redemptions Initiated by the Funds

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

In order to separate retail investors (natural persons) and non-retail investors, Invesco Tax-Free Cash Reserve Portfolio reserves the right to redeem shares in any account that the Fund cannot confirm to its satisfaction are beneficially owned by natural persons. The Fund will provide advance written notice of its intent to make any such involuntary redemptions.

Neither a Fund nor its investment adviser will be responsible for any loss in an investor’s account or tax liability resulting from an involuntary redemption.

Rights Reserved by the Funds

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

■	reject or cancel all or any part of any purchase order;
■	modify any terms or conditions related to the purchase or redemption of shares of any Fund; or
■	suspend, change or withdraw all or any part of the offering made by this prospectus.

Exchanging Shares

You may only exchange shares of Invesco Government & Agency Portfolio, Invesco Treasury Obligations Portfolio Invesco Liquid Assets Portfolio, Invesco STIC Prime Portfolio, Invesco Tax-Free Cash Reserve Portfolio or Invesco Treasury Portfolio for shares of other money market funds in Short-Term Investments Trust and AIM Treasurer’s Series Trust (Invesco Treasurer’s Series Trust) (except for Investor Class Shares), but may not exchange shares of such Funds for retail shares of other Invesco Funds.

Pricing of Shares

Determination of Net Asset Value

Invesco Treasury Portfolio and Invesco 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.

Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Invesco STIC Prime Portfolio generally determines the net asset value of its shares at 3:00 p.m. Eastern Time, and Invesco Liquid Assets Portfolio generally determines the net asset value of its shares at 8:00 a.m., 12:00 p.m., and 3:00 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. For Funds with multiple net asset value strike times, in the event the Fund closes early on a business day, the Fund’s last net asset value strike time for such day will be the strike time immediately prior to the Fund’s early close.

Each Fund values its portfolio securities for which market quotations are readily available at market value, and calculates its net asset values to four decimals (e.g., $1.0000). Securities and other assets quoted in foreign currencies are valued in U.S. dollars based on the prevailing exchange rates on that day. The Funds value securities and assets for which market quotations are unavailable at their “fair value,” which is described below.

Even when market quotations are available, they may be stale or unreliable because the security is not traded frequently, trading on the security ceased before the close of the trading market or issuer specific events occurred after the security ceased trading or because of the passage of time between the close of the market on which the security trades and the close of the New York Stock Exchange (NYSE) and when the Fund calculates its net asset value. Issuer specific events may cause the last market quotation to be unreliable. Such events may include a merger or insolvency, events that affect a geographical area or an industry segment, such as political events or natural disasters, or market events, such as a significant movement in the U.S. market. Where the Adviser determines that the closing price of the security is stale or unreliable, the Adviser will value the security at its fair value.

Fair value is that amount that the owner might reasonably expect to receive for the security upon its current sale. A fair value price is an estimated price that requires consideration of all appropriate factors, including indications of fair value available from pricing services. Fair value pricing involves judgment and a Fund that uses fair value methodologies may value securities higher or lower than another Fund using market quotations or its own fair value methodologies to price the same securities.

Investors who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive a greater or lesser number of shares, or higher or lower redemption proceeds, than they would have received if the Fund had not fair-valued the security or had used a different methodology.

The Board has delegated the daily determination of fair value prices to the Adviser’s valuation committee, which acts in accordance with Board approved policies. Fair value pricing methods and pricing services can change from time to time as approved by the Board.

The intended effect of applying fair value pricing is to compute an NAV that accurately reflects the value of a Fund’s portfolio at the time that the NAV is calculated. An additional intended effect is to discourage those seeking to take advantage of arbitrage opportunities resulting from “stale” prices and to mitigate the dilutive impact of any such arbitrage. However,

the application of fair value pricing cannot eliminate the possibility that arbitrage opportunities will exist.

Specific types of securities are valued as follows:

Senior Secured Floating Rate Loans and Senior Secured Floating Rate Debt Securities. Senior secured floating rate loans and senior secured floating rate debt securities are fair valued using evaluated quotes provided by an independent pricing service. Evaluated quotes provided by the pricing service may reflect appropriate factors such as market quotes, ratings, tranche type, industry, company performance, spread, individual trading characteristics, institution-size trading in similar groups of securities and other market data.

Foreign Securities. If market quotations are available and reliable for foreign exchange traded equity securities, the securities will be valued at the market quotations. Because trading hours for certain foreign securities end before the close of the NYSE, closing market quotations may become unreliable. If between the time trading ends on a particular security and the close of the customary trading session on the NYSE events occur that are significant and may make the closing price unreliable, the Fund may fair value the security. If an issuer specific event has occurred that the Adviser determines, in its judgment, is likely to have affected the closing price of a foreign security, it will price the security at fair value. The Adviser also relies on a screening process from a pricing vendor to indicate the degree of certainty, based on historical data, that the closing price in the principal market where a foreign security trades is not the current market value as of the close of the NYSE. For foreign securities where the Adviser believes, at the approved degree of certainty, that the price is not reflective of current market value, the Adviser will use the indication of fair value from the pricing service to determine the fair value of the security. The pricing vendor, pricing methodology or degree of certainty may change from time to time. Fund securities primarily traded on foreign markets may trade on days that are not business days of the Fund. Because the net asset value of Fund shares is determined only on business days of the Fund, the value of the portfolio securities of a Fund that invests in foreign securities may change on days when you will not be able to purchase or redeem shares of the Fund.

Fixed Income Securities. Fixed income securities, such as government, corporate, asset-backed and municipal bonds, convertible securities, including high yield or junk bonds, and loans, normally are valued on the basis of prices provided by independent pricing services. Prices provided by the pricing services may be determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as institution-size trading in similar groups of securities, developments related to special securities, dividend rate, maturity and other market data. Pricing services generally value fixed income securities assuming orderly transactions of institutional round lot size, but a Fund may hold or transact in the same securities in smaller, odd lot sizes. Odd lots often trade at lower prices than institutional round lots. Prices received from pricing services are fair value prices. In addition, if the price provided by the pricing service and independent quoted prices are unreliable, the Adviser’s valuation committee will fair value the security using procedures approved by the Board.

Short-term Securities. The Funds value variable rate securities that have an unconditional demand or put feature exercisable within seven days or less at par, which reflects the market value of such securities.

Open-end Funds. If a Fund invests in other open-end funds, other than open-end funds that are exchange traded, the investing Fund will calculate its net asset value using the net asset value of the underlying fund in which it invests, and the prospectuses for such open-end funds explain the circumstances under which they will use fair value pricing and the effects of using fair value pricing.

Invesco Treasury Obligations Portfolio and Invesco Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Invesco Treasury Obligations Portfolio will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time. Invesco Tax-Free Cash Reserve Portfolio will generally determine the net asset value of its shares at 4:00 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 opens for business at 7:30 a.m. Eastern Time. Each Fund prices purchase and redemption orders on each business day at the net asset value calculated after the Funds’ transfer agent receives an order in good form.

A business day is any day that (1) both the Federal Reserve Bank of New York and the Fund’s custodian are open for business and (2) the primary trading markets for the Fund’s portfolio instruments are open and the Fund’s management believes there is an adequate market to meet purchase and redemption requests. 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, in turn, places its orders to the Funds’ transfer agent through the NSCC, the Funds’ 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 NYSE restricts or suspends trading.

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

If a Fund closes early on a business day, as described in this section, the Fund will calculate its net asset value as of the time of such closing.

Currently, certain financial intermediaries may serve as agents for the Funds and accept orders on their behalf. Where a financial intermediary serves as agent, the order is priced at the Fund’s net asset value next calculated after it is accepted by the financial intermediary. In such cases, if requested by a Fund, the financial intermediary is responsible for providing information with regard to the time that such order for purchase, redemption or exchange was received. Orders submitted through a financial intermediary that has not received authorization to accept orders on a Fund’s behalf are priced at the Fund’s net asset value next calculated by the Fund after it receives the order from the financial intermediary and accepts it, which may not occur on the day submitted to the financial intermediary.

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:

■	Each Fund is offered to investors as a cash management vehicle; therefore, investors should be able to purchase and redeem shares regularly and frequently.
■	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.
■	With respect to Funds maintaining a constant net asset value, each Fund’s portfolio securities are valued on the basis of amortized cost, and the Funds seek to maintain a constant net asset value. As a result, the Funds are not subject to price arbitrage opportunities.
■	With respect to Funds maintaining a constant net asset value, because such Funds seek to maintain a constant net asset value, investors are

more likely to expect to receive the amount they originally invested in the Funds upon redemption than other mutual funds. 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. Moreover, excessive trading activity in the Fund’s shares may cause the Fund to incur increased brokerage and administrative costs.

Each Fund and its agent reserve 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

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:

Fund Tax Basics

■	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 generally are taxable to you as ordinary income.
■	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.
■	None of the dividends paid by a Fund will qualify as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
■	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.

■	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. An exchange occurs when the purchase of shares of a Fund is made using the proceeds from a redemption of shares of another Fund and is effectuated on the same day as the redemption. Because the Funds, other than the Invesco Liquid Assets Portfolio and the Invesco STIC Prime Portfolio, expect 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 (unless the investor incurs a liquidity fee on such sale or exchange). See, “Liquidity Fees and Redemption Gates.”
■	Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio each round their current net asset value per share to a minimum of the fourth decimal place, therefore, investors will have gain or loss on the sale or exchange of shares of those Funds calculated by subtracting from the gross proceeds received from the sale or exchange your cost basis.
■	Regarding Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, because the Fund is not expected to maintain a stable share price, a sale or exchange of Fund shares may result in a capital gain or loss for you. Unless you choose to adopt a simplified “NAV method” of accounting (described below), any capital gain or loss on the sale or exchange of Fund shares (as noted above) generally will be treated either as short-term if you held your Fund shares for one year or less, or long-term if you held your Fund shares longer. If you elect to adopt the NAV method of accounting, rather than computing gain or loss on every taxable disposition of Fund shares as described above, you would determine your gain or loss based on the change in the aggregate value

	of your Fund shares during a computation period (such as your taxable year), reduced by your net investment (purchases minus sales) in those shares during that period. Under the NAV method, any resulting net capital gain or loss would be treated as short-term capital gain or loss.
■	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 Internal Revenue Service (IRS) instructs it to do so. When withholding is required, the amount will be 28% of any distributions or proceeds paid.
■	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.
■	An additional 3.8% Medicare tax is imposed on certain net investment income (including ordinary dividends and capital gain distributions received from a Fund and net gains from redemptions or other taxable dispositions of Fund shares) of U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds a threshold amount. This Medicare tax, if applicable, is reported by you on, and paid with, your federal income tax return.

■

Fund distributions and gains from sale or exchange of your Fund shares generally are subject to state and local income taxes, except for Invesco Tax-Free Cash Reserve Portfolio. Information on Invesco Tax-Free Cash Reserve Portfolio is located below, under the heading “Invesco Tax-Free Cash Reserve Portfolio.”

■	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.
■	Under the Foreign Account Tax Compliance Act (FATCA), a Fund will be required to withhold a 30% tax on the following payments or distributions made by the Fund to certain foreign entities, referred to as foreign financial institutions or non-financial foreign entities, that fail to comply (or be deemed compliant) with extensive reporting and withholding requirements designed to inform the U.S. Department of the Treasury of U.S.-owned foreign investment accounts: (a) income dividends and (b) after December 31, 2018, certain capital gain distributions, return of capital distributions and the proceeds arising from the sale of Fund shares. A Fund may disclose the information that it receives from its shareholders to the IRS, non-U.S. taxing authorities or other parties as necessary to comply with FATCA or similar laws. Withholding also may be required if a foreign entity that is a shareholder of a Fund fails to provide the Fund with appropriate certifications or other documentation concerning its status under FATCA.
■	There is some degree of uncertainty with respect to the tax treatment of liquidity fees received by a Fund, and such tax treatment may be the subject of future IRS guidance. If a Fund receives liquidity fees, it will consider the appropriate tax treatment of such fees to the Fund at such time.

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.

Invesco Tax-Free Cash Reserve Portfolio

■

You will not be required to include the “exempt-interest” portion of dividends paid by the Fund in either your gross income for federal income tax purposes or your net investment income subject to the additional 3.8% Medicare tax. 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.
■	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, unless such municipal securities were issued in 2009 or 2010.
■	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.
■	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.
■	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.
■	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 IRS 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.

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 the Funds’ transfer agent at 800-659-1005 or contact your financial institution. The Funds’ transfer agent will begin sending you individual copies for each account within thirty days after receiving your request.

A-7                                   The Invesco Funds

Obtaining Additional Information

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

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

Prospectus

December 15, 2017

Institutional Money Market Funds

Invesco Liquid Assets Portfolio  (LPCXX)

Invesco STIC Prime Portfolio  (SSCXX)

Government Money Market Funds

Invesco Treasury Portfolio  (TYCXX)

Invesco Government & Agency Portfolio  (AGCXX)

Invesco Treasury Obligations Portfolio  (TACXX)

Retail Money Market Fund

Invesco Tax-Free Cash Reserve Portfolio  (TFOXX)

Corporate Classes

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

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

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

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

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

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

As with all other mutual fund securities, the U.S. Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

You could lose money by investing in each Fund. An investment in each Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Each Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. Investments in each Fund are not guaranteed by a bank and investment is not a bank deposit.

Table of Contents

Fund Summaries	1
Invesco Liquid Assets Portfolio	1
Invesco STIC Prime Portfolio	3
Invesco Treasury Portfolio	5
Invesco Government & Agency Portfolio	7
Invesco Treasury Obligations Portfolio	8
Invesco Tax-Free Cash Reserve Portfolio	10
Investment Objective(s), Strategies, Risks and Portfolio Holdings	12
Invesco Liquid Assets Portfolio	12
Invesco STIC Prime Portfolio	14
Invesco Treasury Portfolio	15
Invesco Government & Agency Portfolio	16
Invesco Treasury Obligations Portfolio	18
Invesco Tax-Free Cash Reserve Portfolio	19
Fund Management	20
The Adviser(s)	20
Adviser Compensation	20
Other Information	21
Dividends and Distributions	21
Financial Highlights	22
Hypothetical Investment and Expense Information	23
Shareholder Account Information	A-1
Purchasing Shares	A-1
Redeeming Shares	A-2
Pricing of Shares	A-4
Frequent Purchases and Redemptions of Fund Shares	A-5
Taxes	A-6
Important Notice Regarding Delivery of Security Holder Documents	A-7
Obtaining Additional Information Back Cover

                                   Short-Term Investment Trust

Fund Summaries

Invesco 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

    

1

Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed to waive advisory fees and/or reimburse expenses 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 0.21% of the Fund's average daily net assets (the “expense limit”). Unless Invesco continues the fee waiver agreement, it will terminate on December 31, 2018. During its term, the fee waiver agreement cannot be terminated or amended to increase the expense limit without approval of the Board of Trustees.

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$22	$85	$155	$360

Principal Investment Strategies of the Fund

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of

comparable quality. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current net asset value (NAV) per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities. The Fund invests in conformity with U.S. Securities 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 calendar 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 calendar days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), of no more than 120 calendar days. Each investment must be determined to present minimal credit risks by Invesco Advisers, Inc. (Invesco or the Adviser) pursuant to guidelines approved by the Fund’s Board of Trustees (the Board), and must be an Eligible Security.

The Fund may invest up to 50% of its total assets in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 or any other government agency. 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:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly), the supply of short-term financing, changes in government regulation, changes in interest rates, and economic downturns in the United States and abroad.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on

longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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. The Fund is subject to the risk that the counterparty may default on its obligation to repurchase the underlying instruments collateralizing the repurchase agreement, which may cause the Fund to lose money. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco STIC Prime Portfolio

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	$22	$87	$160	$372

Principal Investment Strategies of the Fund

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of comparable quality.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current net asset value (NAV) per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities.

The Fund invests in conformity with U.S. Securities 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 60 calendar 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 calendar days, and a dollar-weighted average portfolio maturity as determined without exceptions regarding certain interest rate adjustments under Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), of no more than 60 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

The Fund may invest in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 or any other government agency. 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:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these

instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly), the supply of short-term financing, changes in government regulation, changes in interest rates, and economic downturns in the United States and abroad.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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. The Fund is subject to the risk that the counterparty may default on its obligation to repurchase the underlying instruments collateralizing the repurchase agreement, which may cause the Fund to lose money. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Treasury Portfolio

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$22	$72	$127	$291

Principal Investment Strategies of the Fund

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), 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 U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes

the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could

absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Government & Agency Portfolio

and liquidity of investments. The Fund invests only in U.S. dollar denominated securities maturing within 397 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the

sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Treasury Obligations Portfolio

periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$22	$76	$137	$314

Principal Investment Strategies of the Fund

The Fund invests at least 99.5% of its total assets in cash and Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government. At the present time, the Fund has no current intention to invest in securities other than direct obligations of the U.S. Treasury.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 Government Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7),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 U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board of Trustees, and must be an Eligible Security.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest

rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

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.

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 ^SM .

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

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, in which case your distributions generally will be taxed when withdrawn from the tax-deferred 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.

Invesco Tax-Free Cash Reserve Portfolio

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

    

1

Invesco Advisers, Inc. (Invesco or the Adviser) has contractually agreed to waive advisory fees and/or reimburse expenses 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 0.23%, of the Fund's average daily net assets (the “expense limit”). Unless Invesco continues the fee waiver agreement, it will terminate on December 31, 2018. During its term, the fee waiver agreement cannot be terminated or amended to increase the expense limit without approval of the Board of Trustees.

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 equal to the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement in the first year and the Total Annual Fund Operating Expenses thereafter.

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	$24	$111	$207	$489

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 that (i) pay interest that is excluded from gross income for federal income tax purposes, and (ii) do not produce income that will be considered to be an item of preference for purposes of the alternative minimum tax. While the Fund’s distributions are primarily exempt from federal income tax, a portion of the Fund’s distributions may be subject to the federal alternative minimum tax and state and local taxes.

In complying with the 80% investment requirement, the Fund may include other instruments that have economic characteristics similar to the Fund's direct investments that are counted toward the 80% investment requirement.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 (which include tender option bonds and variable rate instruments which are created when fixed rate bonds are coupled with a third-party demand feature) and certain types of industrial revenue bonds 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 intends to qualify as a Retail Money Market Fund, as defined by Rule 2a-7 under the Investment Company Act of 1940, as amended (Rule 2a-7), 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. Retail Money Market Funds may be beneficially owned only by natural persons, as determined in the “Shareholder Account Information – Purchase Shares” section of this Prospectus. The Fund invests in conformity with U.S. Securities 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure. The Fund may also invest in daily and weekly variable-rate demand notes.

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 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. 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:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the Fund's foreign investments may be adversely affected by political and social instability, changes in economic or taxation policies, difficulty in enforcing obligations, decreased liquidity or increased volatility. Foreign investments also involve the risk of the possible seizure, nationalization or expropriation of the issuer or foreign deposits (in which the Fund could lose its entire investments in a certain market) and the possible adoption of foreign governmental restrictions such as exchange controls.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. Additionally, legislative, regulatory, or tax developments may adversely affect management of the Fund and, therefore, the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Failure of a municipal security issuer to comply with applicable tax requirements may make income paid thereon taxable, resulting 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.

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 these instruments, which could result in a loss.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly). Financial services companies may be dependent on the supply of short-term financing. The value of bank instruments and securities of issuers in the banking and financial services industry, or guaranteed by such issuers, can be affected by and sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad. The risk of holding bank instruments is also directly tied to the risk of insolvency or bankruptcy of the issuing banks, which risk may be higher for larger or more complex financial institutions that combine traditional, commercial and investment banking.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee

that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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 defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could

affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco STIC Prime 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 without shareholder approval.

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

The Fund may engage in repurchase agreement transactions that are collateralized by cash or government securities. In addition, it may engage in repurchase agreement transactions that are collateralized by nongovernment securities such as equity securities and fixed income securities that are rated investment grade and below investment grade by nationally recognized statistical rating organizations or unrated securities of comparable quality.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a money market fund that rounds the Fund’s current NAV per share to a minimum of the fourth decimal place. Although the Fund is a money market fund, the NAV of the Fund’s shares “floats,” fluctuating with changes in the values of the Fund’s portfolio securities. 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 60 calendar 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 calendar 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 60 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

The Fund may invest in U.S. dollar-denominated foreign securities. Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of

Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Banking and Financial Services Industry Focus Risk. From time to time, the Fund may invest more than 25% of its assets in unsecured bank instruments, including but not limited to certificates of deposit and time deposits, or securities that may have guarantees or credit or liquidity enhancements provided by banks, insurance companies or other financial institutions. To the extent the Fund focuses its investments in these instruments or securities, the Fund’s performance will depend on the overall condition of those industries and the individual banks and financial institutions in which the Fund invests (directly or indirectly). Financial services companies may be dependent on the supply of short-term financing. The value of bank instruments and securities of issuers in the banking and financial services industry, or guaranteed by such issuers, can be affected by and sensitive to changes in government regulation and interest rates and to economic downturns in the United States and abroad. The risk of holding bank instruments is also directly tied to the risk of insolvency or bankruptcy of the issuing banks, which risk may be higher for larger or more complex financial institutions that combine traditional, commercial and investment banking.

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

Money Market Fund Risk. Because the share price of the Fund will fluctuate, when you sell your shares they may be worth more or less than what you originally paid for them and you may lose money by investing in the Fund. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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 defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value. These risks are magnified to the extent that a repurchase agreement is secured by securities other than cash or U.S. Government securities.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Treasury 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 without shareholder approval.

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, 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. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund as defined by Rule 2a-7. As permitted by 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry.

Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Government & Agency 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 without shareholder approval.

The Fund invests at least 99.5% of its total assets in cash, Government Securities, and repurchase agreements collateralized by cash or Government Securities. In addition, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested, under normal circumstances, 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, as well as repurchase agreements secured by those obligations. Direct obligations of the U.S. Treasury generally include bills, notes and bonds. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash or repurchase agreements collateralized by cash. Government Security generally means any security issued or guaranteed as to principal or interest by the U.S. Government or certain of its agencies or instrumentalities; or any certificate of deposit for any of the foregoing. The Fund considers repurchase agreements with the Federal Reserve Bank of New York to be U.S. Government securities for purposes of the Fund’s investment policies.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations at the time of purchase.

The Fund is a Government Money Market Fund as defined by Rule 2a-7. As permitted by 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 calendar 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 calendar 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 calendar days. Each investment must be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience

losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

Repurchase Agreement Risk. If the seller of a repurchase agreement defaults or otherwise does not fulfill its obligations, the Fund may incur delays and losses arising from selling the underlying securities, enforcing its rights, or declining collateral value.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco Treasury Obligations Portfolio

interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility. While the Board of Trustees may implement procedures to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

U.S. Government Obligations Risk. Obligations of U.S. Government agencies and authorities receive varying levels of support and may not be backed by the full faith and credit of the U.S. Government, which could affect the Fund’s ability to recover should they default. No assurance can be given that the U.S. Government will provide financial support to its agencies and authorities if it is not obligated by law to do so.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Invesco 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 without shareholder approval.

The Fund invests under normal circumstances at least 80% of its net assets (plus any borrowings for investment purposes) in debt securities that (i) pay interest that is excluded from gross income for federal income tax purposes, and (ii) do not produce income that will be considered to be an item of preference for purposes of the alternative minimum tax. While the Fund’s distributions are primarily exempt from federal income tax, a portion of the Fund’s distributions may be subject to the federal alternative minimum tax and state and local taxes.

In complying with the 80% investment requirement, the Fund may include other instruments that have economic characteristics similar to the Fund's direct investments that are counted toward the 80% investment requirement.

The Fund will limit investments to those securities that are Eligible Securities as defined by applicable regulations 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 include tender option bonds and variable rate instruments, which are created when fixed rate bonds are coupled with a third-party demand feature) and certain types of industrial revenue bonds 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 intends to qualify as a Retail Money Market Fund, as defined by Rule 2a-7, 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. Retail Money Market Funds may be beneficially owned only by natural persons, as determined in the “Shareholder Account Information – Purchasing Shares” section of this Prospectus. 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 calendar 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 calendar 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 calendar days. Each investment must

be determined to present minimal credit risks by the Adviser pursuant to guidelines approved by the Board, and must be an Eligible Security.

Some of the Fund’s investments, although U.S. dollar-denominated, may be subject to foreign credit exposure.

The Fund may also invest in daily and weekly variable-rate demand notes.

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 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 portfolio maturity or investing in other securities that are Eligible Securities for purchase by money market funds as described in the Fund’s Statement of Additional Information (SAI), in anticipation of or in response to adverse market, economic, political or other conditions. If the Fund’s portfolio managers do so, different factors could affect the Fund’s performance and the Fund may not achieve its investment objective.

The Fund’s investments in the types of securities and other investments 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 and other investments described in this prospectus. The Fund may also invest in securities and other investments not described in this prospectus.

For more information, see “Description of the Funds and Their Investments and Risks” in the Fund’s SAI.

Risks

The principal risks of investing in the Fund are:

Debt Securities Risk. The prices of debt securities held by the Fund will be affected by changes in interest rates, the creditworthiness of the issuer and other factors. An increase in prevailing interest rates typically causes the value of existing debt securities to fall and often has a greater impact on longer-duration debt securities and higher quality debt securities. Falling interest rates will cause the Fund to reinvest the proceeds of debt securities that have been repaid by the issuer at lower interest rates. Falling interest rates may also reduce the Fund’s distributable income because interest payments on floating rate debt instruments held by the Fund will decline. The Fund could lose money on investments in debt securities if the issuer or borrower fails to meet its obligations to make interest payments and/or to repay principal in a timely manner. If an issuer seeks to restructure the terms of its borrowings or the Fund is required to seek recovery upon a default in the payment of interest or the repayment of principal, the Fund may incur additional expenses. Changes in an issuer’s financial strength, the market’s perception of such strength or in the credit rating of the issuer or the security may affect the value of debt securities. The Adviser’s credit analysis may fail to anticipate such changes, which could result in buying a debt security at an inopportune time or failing to sell a debt security in advance of a price decline or other credit event.

Foreign Securities and 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. Furthermore, the value of the Fund’s foreign investments may be adversely affected by 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.

Management Risk. The Fund is actively managed and depends heavily on the Adviser’s judgment about markets, interest rates or the attractiveness, relative values, liquidity, or potential appreciation of particular investments made for the Fund’s portfolio. The Fund could experience losses if these judgments prove to be incorrect. There can be no guarantee that the Adviser’s investment techniques or investment decisions will produce the desired results. Additionally, legislative, regulatory, or tax developments may affect the investments or investment strategies available to the investment manager in connection with managing the Fund, which may also adversely affect the ability of the Fund to achieve its investment objective.

Market Risk. The market values of the Fund’s investments, and therefore the value of the Fund’s shares, will go up and down, sometimes rapidly or unpredictably. Market risk may affect a single issuer, industry or section of the economy, or it may affect the market as a whole. The value of the Fund’s investments may go up or down due to general market conditions which are not specifically related to the particular issuer, such as real or perceived adverse economic conditions, changes in the general outlook for revenues or corporate earnings, changes in interest or currency rates, regional or global instability, or adverse investor sentiment generally. The value of the Fund’s investments may also go up or down due to factors that affect an individual issuer or a particular industry or sector, such as changes in production costs and competitive conditions within an industry. Individual stock prices tend to go up and down more dramatically than those of certain other types of investments, such as bonds. During a general downturn in the financial markets, multiple asset classes may decline in value. When markets perform well, there can be no assurance that specific investments held by the Fund will rise in value.

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. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not rely on or expect that the sponsor will enter into support agreements or take other actions to provide financial support to the Fund or maintain the Fund’s $1.00 share price at any time. 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, illiquid markets, and/or significant market volatility.

Municipal Securities Risk. The risk of a municipal obligation generally depends on the financial and credit status of the issuer. 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 the security. Municipal obligations may be more susceptible to downgrades or defaults during recessions or similar periods of economic stress. Municipal securities structured as revenue bonds are generally not backed by the taxing power of the issuing municipality but rather the revenue from the particular project or entity for which the bonds were issued. If the Internal Revenue Service 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.

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 these 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.

Yield Risk . 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. When interest rates are very low, the Fund’s expenses could absorb all or a portion of the Fund’s income and yield. Additionally, inflation may outpace and diminish investment returns over time.

Portfolio Holdings

Information concerning the Funds' portfolio holdings as well as their dollar-weighted average portfolio maturity and dollar-weighted average life to maturity as of the last business day or subsequent calendar day of the preceding month will be posted on their Web site no later than five business days after the end of the month and remain posted on the Web site for six months thereafter.

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.

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 about these types of payments.

A discussion regarding the basis for the Board’s 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.

Other Information

    

21                                   Short-Term Investment Trust

 

Corporate Class

	Net asset value, beginning of period	Net investment income (a)	Net gains (losses) on securities (both realized and unrealized)	Total from investment operations	Dividends from net investment income	Distributions from net realized gains	Total distributions	Net asset value, end of period	Total return (b)	Net assets, end of period (000’s omitted)	Ratio of expenses to average net assets with fee waivers and/or expense reimbursements	Ratio of expenses to average net assets without fee waivers and/or expense reimbursements	Ratio of net investment income to average net assets
Invesco Liquid Assets Portfolio
Year ended 08/31/17	$1.00	$0.0048	$0.0036	$0.0084	$(0.0077)	$(0.0005)	$(0.0082)	$1.0002	0.81%	$ 9,483	0.21% (c)	0.29% (c)	0.48% (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.30	169,660	0.18	0.21	0.31
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.05	1,054,301	0.17	0.20	0.05
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.04	670,700	0.17	0.20	0.04
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.09	1,496,576	0.17	0.20	0.09
Invesco STIC Prime Portfolio
Year ended 08/31/17	1.00	0.0059	0.0007	0.0066	(0.0066)	—	(0.0066)	1.0000	0.66	20	0.21 (c)	0.30 (c)	0.59 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.24	9	0.17	0.23	0.23
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.04	77,043	0.07	0.22	0.10
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.08	59,554	0.06	0.22	0.08
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.06	68,522	0.11	0.22	0.08
Invesco Treasury Portfolio
Year ended 08/31/17	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.49	607,827	0.21 (c)	0.23 (c)	0.49 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.14	1,173,253	0.17	0.21	0.14
Year ended 08/31/15	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.01	1,770,653	0.06	0.20	0.02
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.01	1,423,728	0.04	0.20	0.02
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	(0.00)	(0.00)	1.00	0.02	2,837,170	0.09	0.21	0.02
Invesco Government & Agency Portfolio
Year ended 08/31/17	1.00	0.01	(0.00)	0.01	(0.01)	—	(0.01)	1.00	0.53	324,437	0.18 (c)	0.18 (c)	0.55 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.17	316,444	0.16	0.18	0.17
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	631,189	0.08	0.16	0.02
Year ended 08/31/14	1.00	0.00	—	0.00	(0.00)	—	(0.00)	1.00	0.02	659,821	0.06	0.16	0.02
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	(0.00)	(0.00)	1.00	0.03	835,545	0.11	0.17	0.02
Invesco Treasury Obligations Portfolio
Year ended 08/31/17	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.41	10	0.21 (c)	0.25 (c)	0.45 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.11	2,948	0.14	0.39	0.11
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.02	28,019	0.00	0.36	0.08
Year ended 08/31/14	1.00	0.00	(0.00)	0.00	(0.00)	—	(0.00)	1.00	0.04	50,514	0.02	0.32	0.03
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.03	10	0.06	0.23	0.03
Invesco Tax-Free Cash Reserve Portfolio
Year ended 08/31/17	1.00	0.01	(0.00)	0.01	(0.01)	—	(0.01)	1.00	0.54	0	0.23 (c)	0.40 (c)	0.53 (c)
Year ended 08/31/16	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.08	32	0.10	0.34	0.12
Year ended 08/31/15	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.01	26,479	0.03	0.34	0.04
Year ended 08/31/14	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.05	31,522	0.04	0.33	0.04
Year ended 08/31/13	1.00	0.00	0.00	0.00	(0.00)	—	(0.00)	1.00	0.06	31,450	0.10	0.33	0.06

22                                   Short-Term Investment Trust

Hypothetical Investment and Expense Information

    

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 each Fund’s expenses, including investment advisory fees and other Fund costs, on each Fund’s returns over a 10-year period. The example reflects the following:

■	You invest $10,000 in the Fund and hold it for the entire 10-year period;
■	Your investment has a 5% return before expenses each year; and

■

Invesco Liquid Assets Portfolio, Invesco STIC Prime Portfolio, Invesco Treasury Portfolio, Invesco Treasury Obligations Portfolio and Invesco Tax-Free Cash Reserve Portfolio’s current annual expense ratio includes any applicable contractual fee waiver or expense reimbursement for the period committed.

There is no assurance that the annual expense ratio will be the expense ratio for the Funds’ 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.

Invesco 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	0.21%	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	4.79%	9.73%	14.89%	20.31%	25.97%	31.90%	38.12%	44.62%	51.43%	58.57%
End of Year Balance	$10,479.00	$10,972.56	$11,489.37	$12,030.52	$12,597.16	$13,190.48	$13,811.75	$14,462.29	$15,143.46	$15,856.72
Estimated Annual Expenses	$ 21.50	$ 31.10	$ 32.57	$ 34.10	$ 35.71	$ 37.39	$ 39.15	$ 41.00	$ 42.93	$ 44.95

    

Invesco 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	0.21%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%	0.30%
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%	9.72%	14.87%	20.27%	25.92%	31.84%	38.04%	44.53%	51.32%	58.43%
End of Year Balance	$10,479.00	$10,971.51	$11,487.17	$12,027.07	$12,592.34	$13,184.18	$13,803.84	$14,452.62	$15,131.89	$15,843.09
Estimated Annual Expenses	$ 21.50	$ 32.18	$ 33.69	$ 35.27	$ 36.93	$ 38.66	$ 40.48	$ 42.38	$ 44.38	$ 46.46

    

Invesco 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	0.21%	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

    

Invesco 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	0.18%	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	4.82%	9.87%	15.17%	20.72%	26.54%	32.64%	39.03%	45.73%	52.76%	60.12%
End of Year Balance	$10,482.00	$10,987.23	$11,516.82	$12,071.93	$12,653.79	$13,263.71	$13,903.02	$14,573.14	$15,275.57	$16,011.85
Estimated Annual Expenses	$ 18.43	$ 19.32	$ 20.25	$ 21.23	$ 22.25	$ 23.33	$ 24.45	$ 25.63	$ 26.86	$ 28.16

    

Invesco Treasury Obligations 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	0.21%	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%	0.25%
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%	9.77%	14.98%	20.44%	26.16%	32.16%	38.43%	45.01%	51.90%	59.11%
End of Year Balance	$10,479.00	$10,976.75	$11,498.15	$12,044.31	$12,616.42	$13,215.69	$13,843.44	$14,501.00	$15,189.80	$15,911.32
Estimated Annual Expenses	$ 21.50	$ 26.82	$ 28.09	$ 29.43	$ 30.83	$ 32.29	$ 33.82	$ 35.43	$ 37.11	$ 38.88

    

Invesco 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	0.23%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%	0.40%
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	4.77%	9.59%	14.63%	19.90%	25.42%	31.19%	37.22%	43.54%	50.14%	57.04%
End of Year Balance	$10,477.00	$10,958.94	$11,463.05	$11,990.35	$12,541.91	$13,118.84	$13,722.30	$14,353.53	$15,013.79	$15,704.43
Estimated Annual Expenses	$ 23.55	$ 42.87	$ 44.84	$ 46.91	$ 49.06	$ 51.32	$ 53.68	$ 56.15	$ 58.73	$ 61.44

23                                   Short-Term Investment Trust

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Purchase Options
	Opening An Account	Adding To An Account
By Telephone	Open your account as described above.	Call the Funds’ 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 a Liquidity Link Agreement. Mail the application and agreement to the Funds’ 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 reinvested 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

Your broker or financial intermediary may charge service fees for handling redemption transactions.

How to Redeem Shares

Invesco Treasury Portfolio and Invesco 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 Funds’ 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 Funds’ 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 Funds’ 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.

    

Invesco Liquid Assets Portfolio and Invesco 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 Funds’ transfer agent must receive your financial intermediary’s instructions before 3:00 p.m. Eastern Time on a business day in order to effect the redemption on that day.
By Telephone	If placing a redemption request by telephone, you or any person authorized to make account transactions, must call the Funds’ transfer agent before 3:00 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 Funds’ 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.

    

    

Payment of Redemption Proceeds

All redemption orders are processed at the net asset value next determined after the Funds’ transfer agent receives a redemption request in good order.

Invesco Treasury Portfolio and Invesco Government & Agency Portfolio

For Invesco Treasury Portfolio and Invesco Government & Agency Portfolio, the Funds’ transfer agent will normally wire payment for redemptions received prior to 5:30 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, for a redemption request received by the Funds’ 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 Funds’ 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 Funds’ transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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, the Fund may not provide same day settlement of redemption orders.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio

For Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, the Funds’ transfer agent will normally wire payment for redemptions received prior to 3:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, proceeds may not be wired until the next business day. If the Funds’ transfer agent receives a redemption request on a business day after 3:00 p.m. Eastern Time (for Invesco Liquid Assets Portfolio 8:00 a.m., 12:00 p.m. and 3:00 p.m. Eastern time), the redemption will be effected at the net asset value of each Fund next determined, which may be on the next business day, and the Funds’ transfer agent will normally wire redemption proceeds on such next business day,

and in any event no more than seven days, after your redemption request is received in good order.

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, the Fund may not provide same day settlement of redemption orders.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Treasury Obligations Portfolio

The Fund’s transfer agent will normally wire payment for redemptions received prior to 3:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. However, depending on such factors as market liquidity and the size of the redemption, for a redemption request received by the Fund’s transfer agent between 2:30 p.m. Eastern Time and 3:00 p.m. Eastern Time, proceeds may not be wired until the next business day. If the Fund’s transfer agent receives a redemption request on a business day after 3:00 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 Fund’s transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Invesco Tax-Free Cash Reserve Portfolio

The Fund’s transfer agent will normally wire payment for redemptions received prior to 4:00 p.m. Eastern Time on the business day received, and in any event no more than seven days, after your redemption request is received in good order. If the Fund’s transfer agent receives a redemption request on a business day after 4:00 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 Fund’s transfer agent will normally wire redemption proceeds on such next business day, and in any event no more than seven days, after your redemption request is received in good order.

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.

Dividends payable up to the date of redemption on redeemed shares will normally be paid or reinvested 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 the dividends payable up to the date of redemption accompany the proceeds of the redemption.

Redemptions by Telephone

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

Redemptions by Liquidity Link

If you redeem via Liquidity Link, the Funds’ transfer agent will transmit your redemption proceeds electronically to your pre-authorized bank account. The Funds and the Funds’ transfer agent are not liable for Liquidity Link instructions that are not genuine.

Suspension of Redemptions

In the event that a Fund, at the end of a business day, has invested less than 10% of its total assets in weekly liquid assets or the Fund’s price per share as computed for the purpose of distribution, redemption and repurchase, rounded to the nearest 1%, has deviated from the stable price established by the Fund’s Board of Trustees (“Board”) or the Board, including a majority of trustees who are not interested persons as defined in the 1940 Act, determines that such a deviation is likely to occur, and the Board, including a majority of trustees who are not interested persons of the Fund, irrevocably has approved the liquidation of the Fund, the Fund’s Board has the authority to suspend redemptions of Fund shares.

Liquidity Fees and Redemption Gates

For Invesco Tax-Free Cash Reserve Portfolio, Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, if the Fund’s weekly liquid assets fall below 30% of its total assets, the Board, in its discretion, may impose liquidity fees of up to 2% of the value of the shares redeemed and/or suspend redemptions (redemption gates). In addition, if any such Fund’s weekly liquid assets falls below 10% of its total assets at the end of any business day, the Fund must impose a 1% liquidity fee on shareholder redemptions unless the Board determines that not doing so is in the best interests of the Fund.

Liquidity fees and redemption gates are most likely to be imposed, if at all, during times of extraordinary market stress. In the event that a liquidity fee or redemption gate is imposed, the Board expects that for the duration of its implementation and the day after which such gate or fee is terminated, the Fund would strike only one net asset value per day, at the Fund’s last scheduled net asset value calculation time.

The imposition and termination of a liquidity fee or redemption gate will be reported by a Fund to the SEC on Form N-CR. Such information will also be available on the Fund’s Web site. In addition, a Fund will communicate such action through a supplement to its registration statement and may further communicate such action through a press release or by other means. If a liquidity fee is applied by the Board, it will be charged on all redemption orders submitted after the effective time of the imposition of the fee by the Board. Liquidity fees would reduce the amount you receive upon redemption of your shares. In the event a Fund imposes a redemption gate, the Fund or any financial intermediary on its behalf will not accept redemption requests until the Fund provides notice that the redemption gate has been terminated.

Redemption requests submitted while a redemption gate is imposed will be cancelled without further notice. If shareholders still wish to redeem their shares after a redemption gate has been lifted, they will need to submit a new redemption request.

Liquidity fees and redemption gates will generally be used to assist a Fund to help preserve its market–based NAV per share. It is possible that a liquidity fee will be returned to shareholders in the form of a distribution. The Board may, in its discretion, terminate a liquidity fee or redemption gate at any time if it believes such action to be in the best interest of a Fund. Also, liquidity fees and redemption gates will automatically terminate at the beginning of the next business day once a Fund’s weekly liquid assets reach at least 30% of its total assets. Redemption gates may only last up to 10 business days in any 90-day period. When a fee or a gate is in place, the Fund may elect not to permit the purchase of shares or to subject the purchase of shares to certain conditions, which may include affirmation of the purchaser’s knowledge that a fee or a gate is in effect. When a fee or a gate is in place, shareholders will not be permitted to exchange into or out of a Fund.

There is some degree of uncertainty with respect to the tax treatment of liquidity fees received by a Fund, and such tax treatment may be the subject to future IRS guidance. If a Fund receives liquidity fees, it will consider the appropriate tax treatment of such fees to the Fund at such time.

Financial intermediaries are required to promptly take the steps requested by the Funds or their designees to impose or help to implement a liquidity fee or redemption gate as requested from time to time, including the rejection of orders due to the imposition of a fee or gate or the prompt re-confirmation of orders following a notification regarding the implementation of a fee or gate. If a liquidity fee is imposed, these steps are expected to include the submission of separate, rather than combined, purchase and redemption orders from the time of the effectiveness of the liquidity fee or redemption gate and the submission of such order information to the Fund or its designee prior to the next calculation of a Fund’s net asset value. Unless otherwise agreed to between a Fund and financial intermediary, the Fund will withhold liquidity fees on behalf of financial intermediaries. With regard to such orders, a redemption request that a Fund determines in its sole discretion has been received in good order by the Fund or its designated agent prior to the imposition of a liquidity fee or redemption gate may be paid by the Fund despite the imposition of a redemption gate or without the deduction of a liquidity fee. If a liquidity fee is imposed during the day, an intermediary who receives both purchase and redemption orders from a single account holder is not required to net the purchase and redemption orders. However, the intermediary is permitted to apply the liquidity fee to the net amount of redemptions (even if the purchase order was received prior to the time the liquidity fee was imposed).

Where a Financial Intermediary serves as a Fund’s agent for the purpose of receiving orders, trades that are not transmitted to the Fund by the Financial Intermediary before the time required by the Fund or the transfer agent may, in the Fund’s discretion, be processed on an as-of basis, and any cost or loss to the Fund or transfer agent or their affiliates, from such transactions shall be borne exclusively by the Financial Intermediary.

Redemptions Initiated by the Funds

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

In order to separate retail investors (natural persons) and non-retail investors, Invesco Tax-Free Cash Reserve Portfolio reserves the right to redeem shares in any account that the Fund cannot confirm to its satisfaction are beneficially owned by natural persons. The Fund will provide advance written notice of its intent to make any such involuntary redemptions.

Neither a Fund nor its investment adviser will be responsible for any loss in an investor’s account or tax liability resulting from an involuntary redemption.

Rights Reserved by the Funds

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

■	reject or cancel all or any part of any purchase order;
■	modify any terms or conditions related to the purchase or redemption of shares of any Fund; or
■	suspend, change or withdraw all or any part of the offering made by this prospectus.

Exchanging Shares

You may only exchange shares of Invesco Government & Agency Portfolio, Invesco Treasury Obligations Portfolio Invesco Liquid Assets Portfolio, Invesco STIC Prime Portfolio, Invesco Tax-Free Cash Reserve Portfolio or Invesco Treasury Portfolio for shares of other money market funds in Short-Term Investments Trust and AIM Treasurer’s Series Trust (Invesco Treasurer’s Series Trust) (except for Investor Class Shares), but may not exchange shares of such Funds for retail shares of other Invesco Funds.

Pricing of Shares

Determination of Net Asset Value

Invesco Treasury Portfolio and Invesco 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.

Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Invesco STIC Prime Portfolio generally determines the net asset value of its shares at 3:00 p.m. Eastern Time, and Invesco Liquid Assets Portfolio generally determines the net asset value of its shares at 8:00 a.m., 12:00 p.m., and 3:00 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. For Funds with multiple net asset value strike times, in the event the Fund closes early on a business day, the Fund’s last net asset value strike time for such day will be the strike time immediately prior to the Fund’s early close.

Each Fund values its portfolio securities for which market quotations are readily available at market value, and calculates its net asset values to four decimals (e.g., $1.0000). Securities and other assets quoted in foreign currencies are valued in U.S. dollars based on the prevailing exchange rates on that day. The Funds value securities and assets for which market quotations are unavailable at their “fair value,” which is described below.

Even when market quotations are available, they may be stale or unreliable because the security is not traded frequently, trading on the security ceased before the close of the trading market or issuer specific events occurred after the security ceased trading or because of the passage of time between the close of the market on which the security trades and the close of the New York Stock Exchange (NYSE) and when the Fund calculates its net asset value. Issuer specific events may cause the last market quotation to be unreliable. Such events may include a merger or insolvency, events that affect a geographical area or an industry segment, such as political events or natural disasters, or market events, such as a significant movement in the U.S. market. Where the Adviser determines that the closing price of the security is stale or unreliable, the Adviser will value the security at its fair value.

Fair value is that amount that the owner might reasonably expect to receive for the security upon its current sale. A fair value price is an estimated price that requires consideration of all appropriate factors, including indications of fair value available from pricing services. Fair value pricing involves judgment and a Fund that uses fair value methodologies may value securities higher or lower than another Fund using market quotations or its own fair value methodologies to price the same securities.

Investors who purchase or redeem Fund shares on days when the Fund is holding fair-valued securities may receive a greater or lesser number of shares, or higher or lower redemption proceeds, than they would have received if the Fund had not fair-valued the security or had used a different methodology.

The Board has delegated the daily determination of fair value prices to the Adviser’s valuation committee, which acts in accordance with Board approved policies. Fair value pricing methods and pricing services can change from time to time as approved by the Board.

The intended effect of applying fair value pricing is to compute an NAV that accurately reflects the value of a Fund’s portfolio at the time that the NAV is calculated. An additional intended effect is to discourage those seeking to take advantage of arbitrage opportunities resulting from “stale” prices and to mitigate the dilutive impact of any such arbitrage. However,

the application of fair value pricing cannot eliminate the possibility that arbitrage opportunities will exist.

Specific types of securities are valued as follows:

Senior Secured Floating Rate Loans and Senior Secured Floating Rate Debt Securities. Senior secured floating rate loans and senior secured floating rate debt securities are fair valued using evaluated quotes provided by an independent pricing service. Evaluated quotes provided by the pricing service may reflect appropriate factors such as market quotes, ratings, tranche type, industry, company performance, spread, individual trading characteristics, institution-size trading in similar groups of securities and other market data.

Foreign Securities. If market quotations are available and reliable for foreign exchange traded equity securities, the securities will be valued at the market quotations. Because trading hours for certain foreign securities end before the close of the NYSE, closing market quotations may become unreliable. If between the time trading ends on a particular security and the close of the customary trading session on the NYSE events occur that are significant and may make the closing price unreliable, the Fund may fair value the security. If an issuer specific event has occurred that the Adviser determines, in its judgment, is likely to have affected the closing price of a foreign security, it will price the security at fair value. The Adviser also relies on a screening process from a pricing vendor to indicate the degree of certainty, based on historical data, that the closing price in the principal market where a foreign security trades is not the current market value as of the close of the NYSE. For foreign securities where the Adviser believes, at the approved degree of certainty, that the price is not reflective of current market value, the Adviser will use the indication of fair value from the pricing service to determine the fair value of the security. The pricing vendor, pricing methodology or degree of certainty may change from time to time. Fund securities primarily traded on foreign markets may trade on days that are not business days of the Fund. Because the net asset value of Fund shares is determined only on business days of the Fund, the value of the portfolio securities of a Fund that invests in foreign securities may change on days when you will not be able to purchase or redeem shares of the Fund.

Fixed Income Securities. Fixed income securities, such as government, corporate, asset-backed and municipal bonds, convertible securities, including high yield or junk bonds, and loans, normally are valued on the basis of prices provided by independent pricing services. Prices provided by the pricing services may be determined without exclusive reliance on quoted prices, and may reflect appropriate factors such as institution-size trading in similar groups of securities, developments related to special securities, dividend rate, maturity and other market data. Pricing services generally value fixed income securities assuming orderly transactions of institutional round lot size, but a Fund may hold or transact in the same securities in smaller, odd lot sizes. Odd lots often trade at lower prices than institutional round lots. Prices received from pricing services are fair value prices. In addition, if the price provided by the pricing service and independent quoted prices are unreliable, the Adviser’s valuation committee will fair value the security using procedures approved by the Board.

Short-term Securities. The Funds value variable rate securities that have an unconditional demand or put feature exercisable within seven days or less at par, which reflects the market value of such securities.

Open-end Funds. If a Fund invests in other open-end funds, other than open-end funds that are exchange traded, the investing Fund will calculate its net asset value using the net asset value of the underlying fund in which it invests, and the prospectuses for such open-end funds explain the circumstances under which they will use fair value pricing and the effects of using fair value pricing.

Invesco Treasury Obligations Portfolio and Invesco Tax-Free Cash Reserve Portfolio

The price of each Fund’s shares is the Fund’s net asset value per share. Invesco Treasury Obligations Portfolio will generally determine the net asset value of its shares at 3:30 p.m. Eastern Time. Invesco Tax-Free Cash Reserve Portfolio will generally determine the net asset value of its shares at 4:00 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 opens for business at 7:30 a.m. Eastern Time. Each Fund prices purchase and redemption orders on each business day at the net asset value calculated after the Funds’ transfer agent receives an order in good form.

A business day is any day that (1) both the Federal Reserve Bank of New York and the Fund’s custodian are open for business and (2) the primary trading markets for the Fund’s portfolio instruments are open and the Fund’s management believes there is an adequate market to meet purchase and redemption requests. 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, in turn, places its orders to the Funds’ transfer agent through the NSCC, the Funds’ 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 NYSE restricts or suspends trading.

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

If a Fund closes early on a business day, as described in this section, the Fund will calculate its net asset value as of the time of such closing.

Currently, certain financial intermediaries may serve as agents for the Funds and accept orders on their behalf. Where a financial intermediary serves as agent, the order is priced at the Fund’s net asset value next calculated after it is accepted by the financial intermediary. In such cases, if requested by a Fund, the financial intermediary is responsible for providing information with regard to the time that such order for purchase, redemption or exchange was received. Orders submitted through a financial intermediary that has not received authorization to accept orders on a Fund’s behalf are priced at the Fund’s net asset value next calculated by the Fund after it receives the order from the financial intermediary and accepts it, which may not occur on the day submitted to the financial intermediary.

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:

■	Each Fund is offered to investors as a cash management vehicle; therefore, investors should be able to purchase and redeem shares regularly and frequently.
■	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.
■	With respect to Funds maintaining a constant net asset value, each Fund’s portfolio securities are valued on the basis of amortized cost, and the Funds seek to maintain a constant net asset value. As a result, the Funds are not subject to price arbitrage opportunities.
■	With respect to Funds maintaining a constant net asset value, because such Funds seek to maintain a constant net asset value, investors are

more likely to expect to receive the amount they originally invested in the Funds upon redemption than other mutual funds. 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. Moreover, excessive trading activity in the Fund’s shares may cause the Fund to incur increased brokerage and administrative costs.

Each Fund and its agent reserve 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

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:

Fund Tax Basics

■	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 generally are taxable to you as ordinary income.
■	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.
■	None of the dividends paid by a Fund will qualify as qualified dividend income subject to reduced rates of taxation in the case of non-corporate shareholders.
■	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.

■	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. An exchange occurs when the purchase of shares of a Fund is made using the proceeds from a redemption of shares of another Fund and is effectuated on the same day as the redemption. Because the Funds, other than the Invesco Liquid Assets Portfolio and the Invesco STIC Prime Portfolio, expect 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 (unless the investor incurs a liquidity fee on such sale or exchange). See, “Liquidity Fees and Redemption Gates.”
■	Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio each round their current net asset value per share to a minimum of the fourth decimal place, therefore, investors will have gain or loss on the sale or exchange of shares of those Funds calculated by subtracting from the gross proceeds received from the sale or exchange your cost basis.
■	Regarding Invesco Liquid Assets Portfolio and Invesco STIC Prime Portfolio, because the Fund is not expected to maintain a stable share price, a sale or exchange of Fund shares may result in a capital gain or loss for you. Unless you choose to adopt a simplified “NAV method” of accounting (described below), any capital gain or loss on the sale or exchange of Fund shares (as noted above) generally will be treated either as short-term if you held your Fund shares for one year or less, or long-term if you held your Fund shares longer. If you elect to adopt the NAV method of accounting, rather than computing gain or loss on every taxable disposition of Fund shares as described above, you would determine your gain or loss based on the change in the aggregate value

	of your Fund shares during a computation period (such as your taxable year), reduced by your net investment (purchases minus sales) in those shares during that period. Under the NAV method, any resulting net capital gain or loss would be treated as short-term capital gain or loss.
■	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 Internal Revenue Service (IRS) instructs it to do so. When withholding is required, the amount will be 28% of any distributions or proceeds paid.
■	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.
■	An additional 3.8% Medicare tax is imposed on certain net investment income (including ordinary dividends and capital gain distributions received from a Fund and net gains from redemptions or other taxable dispositions of Fund shares) of U.S. individuals, estates and trusts to the extent that such person’s “modified adjusted gross income” (in the case of an individual) or “adjusted gross income” (in the case of an estate or trust) exceeds a threshold amount. This Medicare tax, if applicable, is reported by you on, and paid with, your federal income tax return.

■	Fund distributions and gains from sale or exchange of your Fund shares generally are subject to state and local income taxes, except for Invesco Tax-Free Cash Reserve Portfolio. Information on Invesco Tax-Free Cash Reserve Portfolio is located below, under the heading “Invesco Tax-Free Cash Reserve Portfolio.”
■	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.

■

Under the Foreign Account Tax Compliance Act (FATCA), a Fund will be required to withhold a 30% tax on the following payments or distributions made by the Fund to certain foreign entities, referred to as foreign financial institutions or non-financial foreign entities, that fail to comply (or be deemed compliant) with extensive reporting and withholding requirements designed to inform the U.S. Department of the Treasury of U.S.-owned foreign investment accounts: (a) income dividends and (b) after December 31, 2018, certain capital gain distributions, return of capital distributions and the proceeds arising from the sale of Fund shares. A Fund may disclose the information that it receives from its shareholders to the IRS, non-U.S. taxing authorities or other parties as necessary to comply with FATCA or similar laws. Withholding also may be required if a foreign entity that is a shareholder of a Fund fails to provide the Fund with appropriate certifications or other documentation concerning its status under FATCA.

■

There is some degree of uncertainty with respect to the tax treatment of liquidity fees received by a Fund, and such tax treatment may be the subject of future IRS guidance. If a Fund receives liquidity fees, it will consider the appropriate tax treatment of such fees to the Fund at such time.

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.

Invesco Tax-Free Cash Reserve Portfolio

■

You will not be required to include the “exempt-interest” portion of dividends paid by the Fund in either your gross income for federal income tax purposes or your net investment income subject to the additional 3.8% Medicare tax. 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.
■	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, unless such municipal securities were issued in 2009 or 2010.
■	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.
■	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.
■	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.
■	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 IRS 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.

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 the Funds’ transfer agent at 800-659-1005 or contact your financial institution. The Funds’ transfer agent will begin sending you individual copies for each account within thirty days after receiving your request.

A-7                                   The Invesco Funds

Obtaining Additional Information

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

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

Prospectus

December 15, 2017

Institutional Money Market Funds

Invesco Liquid Assets Portfolio  (LAPXX)

Invesco STIC Prime Portfolio  (SRIXX)

Government Money Market Funds

Invesco Treasury Portfolio  (TRPXX)

Invesco Government & Agency Portfolio  (AGPXX)

Invesco Treasury Obligations Portfolio  (TSPXX)

Retail Money Market Fund

Invesco Tax-Free Cash Reserve Portfolio  (TFPXX)

Institutional Classes

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

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

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

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

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

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

As with all other mutual fund securities, the U.S. Securities and Exchange Commission (SEC) has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

You could lose money by investing in each Fund. An investment in each Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Each Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. Investments in each Fund are not guaranteed by a bank and investment is not a bank deposit.

Table of Contents

Fund Summaries	1
Invesco Liquid Assets Portfolio	1
Invesco STIC Prime Portfolio	3
Invesco Treasury Portfolio	5
Invesco Government & Agency Portfolio	7
Invesco Treasury Obligations Portfolio	8
Invesco Tax-Free Cash Reserve Portfolio	10
Investment Objective(s), Strategies, Risks and Portfolio Holdings	12
Invesco Liquid Assets Portfolio	12
Invesco STIC Prime Portfolio	14
Invesco Treasury Portfolio	15
Invesco Government & Agency Portfolio	16
Invesco Treasury Obligations Portfolio	18
Invesco Tax-Free Cash Reserve Portfolio	19
Fund Management	20
The Adviser(s)	20
Adviser Compensation	20
Other Information	21
Dividends and Distributions	21
Financial Highlights	22
Hypothetical Investment and Expense Information	23
Shareholder Account Information	A-1
Purchasing Shares	A-1
Redeeming Shares	A-2
Pricing of Shares	A-4
Frequent Purchases and Redemptions of Fund Shares	A-5
Taxes	A-6
Important Notice Regarding Delivery of Security Holder Documents	A-7
Obtaining Additional Information Back Cover