As filed with the Securities and Exchange Commission on April 30, 2002
1933 Act File No. 333-30810
1940 Act File No. 811-9819

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X]

Post-effective Amendment No. 10 [X]

and

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT
OF 1940 [X]

Amendment No. 11 [X]

STATE STREET INSTITUTIONAL INVESTMENT TRUST

P.O. BOX 5049, BOSTON, MASSACHUSETTS 02206
(Address of Principal Executive Offices)

(617) 662-3968
(Registrant's Telephone Number)

Julie A. Tedesco, Secretary
One Federal Street, 9th Floor
Boston, Massachusetts 02105-1713
(Name and Address of Agent for Service)

Copy to:

Timothy W. Diggins
Ropes & Gray
One International Place
Boston, Massachusetts 02110-2624

It is proposed that this filing will become effective (check appropriate box):

1

[X] Immediately upon filing pursuant to [ ] On [date] pursuant to

     paragraph (b)                               paragraph (b)

[ ]  60 days after filing                   [ ]  On (date) pursuant to
     pursuant to paragraph (a)(1)                paragraph (a)(1)

[ ]  75 days after filing                   [ ]  On (date) pursuant to
     pursuant to paragraph (a)(2)                paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

[ ] This post-effective amendment designates a new effective date for a previously filed post-effective amendment.


STATE STREET INSTITUTIONAL INVESTMENT TRUST
P.O. BOX 5049
BOSTON, MASSACHUSETTS 02206


STATE STREET EQUITY 500 INDEX FUND
CLASS A SHARES


PROSPECTUS DATED APRIL 30, 2002


THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.


INTRODUCTION

The State Street Equity 500 Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Standard & Poor's 500 Composite Stock Price Index (the "S&P 500 Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust (the "Trust"), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

INVESTMENT OBJECTIVE.

The Fund's investment objective is to match as closely as possible, before expenses, the performance of the S&P 500 Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

PRINCIPAL INVESTMENT STRATEGIES.

The Fund is not managed according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Fund, using a "passive" or "indexing" investment approach, attempts to match, before expenses, the performance of the S&P 500 Index. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from several industrial sectors representing a significant portion of the market value of all stocks publicly traded in the United States. The Adviser seeks a correlation of 0.95 or better between the Fund's performance and the performance of the Index. (1.00 would represent perfect correlation.)

1

The Fund intends to invest in all 500 stocks comprising the Index in proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all 500 stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by the Adviser to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investment directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or enter into swap transactions, to assist in matching the performance of the Index.

PRINCIPAL RISKS.

- Stock values could decline generally or could under-perform other investments.

- Because the S&P 500 Index includes mainly large U.S. companies, the Fund's investments consist mainly of stocks of large U.S. companies. Returns on investments in stocks of large U.S. companies could trail the returns on investments in stocks of smaller companies.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to replicate the performance of the Index may not correlate precisely with the return on the Index.

2

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

PERFORMANCE INFORMATION.

Bar chart

The bar chart below shows the performance of the Fund during the last year. The chart provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year. Please keep in mind that past performance does not necessarily indicate how the Fund will perform in the future.
[STATE STREET EQUITY 500 FUND INDEX BAR CHART]

CALENDAR YEAR END 2001*                                                          -2.97
-----------------------                                                          -----


* Performance for the calendar year ended December 31, 2001 is from the commencement of operations (April 18, 2001) and is not annualized.

During the period shown in the bar chart, the highest return for a quarter was 10.51% (quarter ended December 31, 2001) and the lowest return for a quarter was (14.62%) (quarter ended September 30, 2001).

AVERAGE ANNUAL TOTAL RETURN

The information in the following table gives some indication of the risks of an investment in the Fund by comparing the Fund's performance to the performance of the S&P 500 Index over various periods of time.

The Fund's after-tax returns listed below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Additionally, actual after-tax returns depend on an investor's tax situation and may differ from those shown below, and after-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as individual retirements accounts.

3

                                               SINCE THE INCEPTION
                                                DATE OF THE FUND
                                                (APRIL 18, 2001)
                                               -------------------
State Street Equity 500 Index Fund Class A
  Shares
     Return Before Taxes....................          (2.97%)
     Return After Taxes on Distributions....          (3.29%)
     Return After Taxes on Distributions and
       Sale of Fund Shares..................          (1.81%)
S&P 500 Index*..............................          (2.73%)


* The S&P 500 Index is a capitalization-weighted index of 500 widely held stocks recognized by investors to be representative of the stock market in general. The S&P 500 Index is unmanaged and does not reflect the actual cost of investing in the instruments that comprise the index. Additionally, the returns of the S&P 500 Index do not reflect the effect of fees, expenses and taxes.

FEES AND EXPENSES

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The table and the example below reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)................................   0.045%
Distribution (12b-1) Fees.........................    0.15%
Other Expenses....................................    0.05%
                                                     -----
Total Annual Fund Operating Expenses..............   0.245%

Example: This Example is intended to help you compare the cost of investing in the Fund with the costs of investing in other mutual funds. It 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 5% return and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions yours costs would be:

1 YEAR     3 YEARS    5 YEARS    10 YEARS
-------    -------    -------    --------
  $25        $79       $138        $314


1 This fee represents the total fees paid by the
  corresponding Portfolio of the State Street
  Master Funds.

4

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The S&P 500 Index. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from several industrial sectors representing a significant portion of the market value of all common stocks publicly traded in the United States, most of which are listed on the New York Stock Exchange, Inc. (the "NYSE"). Stocks in the S&P 500 Index are weighted according to their market capitalizations (i.e., the number of shares outstanding multiplied by the stock's current price). The companies selected for inclusion in the S&P 500 Index generally have the largest market value within their respective industries. The composition of the S&P 500 Index is determined by Standard & Poor's and is based on such factors as the market capitalization and trading activity of each stock and its adequacy as a representation of stocks in a particular industry group, and may be changed from time to time. "Standard & Poor's(R)," "S&P," "S&P 500," "Standard & Poor's 500" and "500" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by the Fund. The Fund is not sponsored, endorsed, sold or promoted by S&P, and S&P makes no representation regarding the advisability of investing in the Fund.

Index Futures Contracts and Related Options. The Fund buys and sells futures contracts on the Index and options on those futures contracts. An "index futures" contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Index Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of

5

trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

MANAGEMENT AND ORGANIZATION

The Fund and The Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

6

The Equity 500 Index Fund offers both Class A and Class B shares. Only the Class A shares of the Fund are discussed in this prospectus.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 Act (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street"), a subsidiary of State Street Corporation, is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.05% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that the borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending agent would typically receive a portion of the next investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio,

7

the Fund would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the NYSE is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in the Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

8

DISTRIBUTION/SERVICING (12b-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's Class A shares and for services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.15%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains of the Fund will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

9

FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Fund's financial performance since it commenced operations on April 18, 2001. Certain information reflects financial results for a single Fund share. The total returns in the table represent the rate that an investor would have earned or lost on an investment in the Fund (assuming reinvestment of all dividends and distributions). This information has been audited by Ernst & Young LLP, whose report, along with the Fund's financial statements, are included in the annual report, which is available upon request.

                                             FOR THE PERIOD ENDED
                                             DECEMBER 31, 2001(A)
                                             --------------------
PER SHARE OPERATING PERFORMANCE(b):
NET ASSET VALUE, BEGINNING OF PERIOD......         $  10.00
INVESTMENT OPERATIONS:
  Net investment income...................             0.08
  Net realized and unrealized loss on
     investment and futures contracts.....            (0.38)
                                                   --------
     Total from investment operations.....            (0.30)
LESS DISTRIBUTIONS FROM:
  Net investment income...................            (0.08)
     Total distributions..................            (0.08)
                                                   --------
  Net decrease in net assets..............            (0.38)
                                                   --------
NET ASSET VALUE, END OF PERIOD............         $   9.62
                                                   ========
TOTAL RETURN(c)(d)........................            (2.97)%
                                                   ========
RATIOS AND SUPPLEMENTARY DATA:
Net Assets, End of Period (000s)..........         $171,774
Ratios to average net assets(e):
  Operating expenses......................            0.245%
  Net investment income...................             1.18%
Portfolio turnover rate(e)................               14%


(a) Fund commenced operations on April 18, 2001.

(b) The per share amounts and percentages reflect income and expenses assuming inclusion of the Fund's proportionate share of the income and expenses of the State Street Equity 500 Index Portfolio.

(c) Not Annualized.

(d) Results represent past performance and are not indicative of future results.

(e) Annualized.

10

[This Page Intentionally Left Blank]


[This Page Intentionally Left Blank]


[This Page Intentionally Left Blank]


For more information about STATE STREET EQUITY 500 INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments is available in the Fund's annual and semi-annual reports to shareholders. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports will be available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSGA FUNDS MANAGEMENT, INC.
Two International Place
Boston, Massachusetts 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.


State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET EQUITY 500 INDEX FUND
CLASS B SHARES

Prospectus Dated April 30, 2002

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

2

INTRODUCTION

The State Street Equity 500 Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Standard & Poor's 500(R) Composite Stock Price Index (the "S&P 500 Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust (the "Trust"), which is an open-end management investment company organized under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

Investment Objective. The Fund's investment objective is to match as closely as possible, before expenses, the performance of the S&P 500 Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

Principal Investment Strategies. The Fund is not managed according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Fund, using a "passive" or "indexing" investment approach, attempts to match, before expenses, the performance of the S&P 500 Index. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from several industrial sectors representing a significant portion of the market value of all stocks publicly traded in the United States. The Adviser seeks a correlation of 0.95 or better between the Fund's performance and the performance of the Index (1.00 would represent perfect correlation).

The Fund intends to invest in all 500 stocks comprising the Index in proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all 500 stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by the Adviser to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investment directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment

3

of cash in the stocks comprising the Index. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or enter into swap transactions, to assist in matching the performance of the Index.

Principal Risks.

- Stock values could decline generally or could under-perform other investments.

- Because the S&P 500 Index includes mainly large U.S. companies, the Fund's investments consist mainly of stocks of large U.S. companies. Returns on investments in stocks of large U.S. companies could trail the returns on investments in stocks of smaller companies.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to replicate the performance of the Index may not correlate precisely with the return on the Index.

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its investment objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Information.

The bar chart below shows the performance of the Fund during the last year. The chart provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year. Please keep in mind that past performance does not necessarily indicate how the Fund will perform in the future. ADDITIONALLY, THE PERFORMANCE PRESENTED BELOW IS FOR CLASS A SHARES WHICH HAVE A LOWER EXPENSES THAN CLASS B SHARES. BECAUSE THE OPERATING EXPENSES OF CLASS A SHARES ARE LOWER THAN THE EXPENSES OF CLASS B SHARES, THE PERFORMANCE OF CLASS A SHARES IS HIGHER THAN THE PERFORMANCE OF CLASS B SHARES.

4

State Street Equity 500 Index Fund
Class A Shares
Total Return for the Calendar Year Ended December 31

[BAR CHART}

[AMOUNTS IN PERCENTAGES]

2001     -0.0297

* Performance for the Calendar year ended December 31, 2001 is from the commencement of operations (April 18, 2001) and is not annualized.

During the period shown in the bar chart, the highest return for a quarter was 10.51% (quarter ended December 31, 2001) and the lowest return for a quarter was (14.62%) (quarter ended September 30, 2001).

Average Annual Total Return

The information in the following table gives some indication of the risks of an investment in the Fund by comparing the Fund's performance to the performance of the S&P 500 Index over various periods of time.

The Fund's after-tax returns listed below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Additionally, actual after-tax returns depend on an investor's tax situation and may differ from those shown below, and after-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as individual retirements accounts. ADDITIONALLY, THE PERFORMANCE PRESENTED BELOW IS FOR CLASS A SHARES WHICH HAVE A LOWER EXPENSES THAN CLASS B SHARES. BECAUSE THE OPERATING EXPENSES OF CLASS A SHARES ARE LOWER THAN THE EXPENSES OF CLASS B SHARES, THE PERFORMANCE OF CLASS A SHARES IS HIGHER THAN THE PERFORMANCE OF CLASS B SHARES.

5

                                                                           Since the Inception
                                                                           Date of the Fund (April
                                                                           18, 2001)
State Street Equity 500 Index Fund Class A Shares
         Return Before Taxes                                               (2.97%)
         Return After Taxes on Distributions                               (3.29%)
         Return After Taxes on Distributions and Sale of Fund Shares       (1.81%)
S&P    500 Index*                                                          (2.73%)

* The S&P 500 Index is a capitalization-weighted index of 500 widely held stocks recognized by investors to be representative of the stock market in general. The S&P 500 Index is unmanaged and does not reflect the actual cost of investing in the instruments that comprise the index. Additionally, the returns of the S&P 500 Index do not reflect the effect of fees, expenses and taxes.

FEES AND EXPENSES

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                                   0.045%

Distribution (12b-1) Fees                            0.25%

Other Expenses                                       0.05%
                                                     ------
Total Annual Fund Operating Expenses                 0.345%

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. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


1 This fee represents the total fees paid by the corresponding Portfolio of State Street Master Funds.

6

1 year                    3 years
------                    -------
  $35                       $111

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The S&P 500 Index. The S&P 500 Index is a well-known stock market index that includes common stocks of 500 companies from several industrial sectors representing a significant portion of the market value of all common stocks publicly traded in the United States, most of which are listed on the New York Stock Exchange, Inc. (the "NYSE"). Stocks in the S&P 500 Index are weighted according to their market capitalizations (i.e., the number of shares outstanding multiplied by the stock's current price). The companies selected for inclusion in the S&P 500 Index generally have the largest market value within their respective industries. The composition of the S&P 500 Index is determined by Standard & Poor's and is based on such factors as the market capitalization and trading activity of each stock and its adequacy as a representation of stocks in a particular industry group, and may be changed from time to time. "Standard & Poor's (R)," "S&P," "S&P 500," "Standard & Poor's 500" and "500" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by the Fund. The Fund is not sponsored, endorsed, sold or promoted by S&P, and S&P makes no representation regarding the advisability of investing in the Fund.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts on the Index and options on those futures contracts. An "index futures" contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Index Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase

7

agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

MANAGEMENT AND ORGANIZATION

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Equity 500 Index Fund offers both Class A and Class B shares. Only the Class B shares of the Fund are discussed in this prospectus.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 (the "1940 Act"), which require periodic review of these transactions.

8

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street"), a subsidiary of State Street Corporation, is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.05% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending agent would typically receive a portion of the net investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio, the Fund would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the New York Stock Exchange (the "NYSE") is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in this Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the

9

Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12B-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's Class B shares and for services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.25%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

10

For more information about STATE STREET EQUITY 500 INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports will be available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

11

State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET EQUITY 400 INDEX FUND

Prospectus Dated April 30, 2002

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

1

INTRODUCTION

The State Street Equity 400 Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Standard & Poor's MidCap 400(R) Composite Stock Price Index (the "S&P 400 Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust (the "Trust"), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser") is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

Investment Objective. The Fund's investment objective is to match as closely as possible, before expenses, the performance of the S&P 400 Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

Principal Investment Strategies. The Fund is not managed according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Fund, using a "passive" or "indexing" investment approach, attempts to match, before expenses, the performance of the S&P 400 Index. The S&P 400 Index is a well-known stock market index that includes common stocks of 400 mid-sized companies from several industrial sectors representing a significant portion of the market value of all stocks publicly traded in the United States. (For a discussion of how the securities in the S&P 400 Index are selected, see "Other Investment Considerations and Risks - The S&P 400 Index," below.) The Adviser seeks a correlation of 0.95 or better between the Fund's performance and the performance of the Index (1.00 would represent perfect correlation).

The Fund intends to invest in all of the stocks comprising the Index in proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all 400 stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by the Adviser to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.

2

In addition, the Fund may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investment directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or enter into swap transactions, to assist in matching the performance of the Index.

Principal Risks.

- Stock values could decline generally or could under-perform other investments.

- Because the S&P 400 Index includes stocks of mainly mid-capitalization ("mid-cap") companies, the Fund's investments consist mainly of stocks of mid-cap companies. Returns on investments in mid-cap stocks could be more volatile than, or trail the returns on, investments in larger or smaller capitalization ("large-cap" and "small-cap," respectively) U.S. stocks.

- Mid-cap companies may be more likely than large-cap companies to have relatively limited product lines, markets or financial resources, or depend on a few key employees.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to replicate the performance of the Index may not correlate precisely with the return on the Index.

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its investment objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Information.

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus.

FEES AND EXPENSES

3

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                                   0.08%

Distribution (12b-1) Fees                            0.25%

Other Expenses                                       0.10%
                                                     ----
Total Annual Fund Operating Expenses                 0.43%

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. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year                          3 years
------                          -------
  $44                             $138

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The S&P 400 Index. The S&P 400 Index is a well-known stock market index that includes common stocks of 400 companies from several industrial sectors representing a large cross-section of mid-cap stocks publicly traded in the United States, most of which are listed on the New York Stock Exchange, Inc. (the "NYSE"). Unlike the S&P 500 Index, which is designed to represent the performance of the large-cap sector of the U.S. securities market, the S&P 400 Index is designed to represent the performance of the mid-cap sector of the U.S. securities market. Stocks in the S&P 400 Index are weighted according to their market capitalizations (i.e., the number of shares outstanding multiplied by the stock's current price). The companies chosen for the S&P 400 Index generally have market values between $800 million and $3 billion, depending upon current equity market valuations. (Stocks in the S&P 400

(1) This fee represents the total fees paid by the corresponding Portfolio of State Street Master Funds.

4

Index will not simultaneously be listed in the S&P 500 Index.) The composition of the S&P 400 Index is determined by Standard & Poor's and is based on such factors as the market capitalization and trading activity of each stock and its adequacy as a representation of stocks in a particular industry group, and may be changed from time to time. "Standard & Poor's(R)," "S&P," "S&P 400," "Standard & Poor's 400" and "400" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for use by the Fund. The Fund is not sponsored, endorsed, sold or promoted by S&P, and S&P makes no representation regarding the advisability of investing in the Fund.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts on the Index and options on those futures contracts. An "index futures" contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Index Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

5

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

MANAGEMENT AND ORGANIZATION

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street"), a subsidiary of State Street Corporation, is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.10% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for

6

the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending agent would typically receive a portion of the net investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio, the Fund would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the New York Stock Exchange (the "NYSE") is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in this Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12b-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's shares and for

7

services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.25%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains of the Fund will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

8

For more information about STATE STREET EQUITY 400 INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders after the Fund has been in existence for a calendar year. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

9

State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET EQUITY 2000 INDEX FUND

Prospectus Dated April 30, 2002

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

1

INTRODUCTION

The State Street Equity 2000 Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Russell 2000(R) Index (the "Russell 2000 Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust, which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

Investment Objective. The Fund's investment objective is to match as closely as possible, before expenses, the performance of the Russell 2000 Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

Principal Investment Strategies. The Fund uses a management strategy designed to track the performance of the Russell 2000 Index. The Russell 2000 Index is one of the most widely accepted benchmarks of U.S. small capitalization stock market total return. It includes the 2,000 smallest capitalization stocks of the 3,000 largest capitalization U.S. stocks.

The Fund, using an "indexing" investment approach, attempts to match, before expenses, the performance of the Russell 2000 Index. The Adviser seeks a correlation of 0.95 or better between the Fund's performance and the performance of the Index (1.00 would represent perfect correlation).

The Fund may invest in all of the stocks comprising the Index in proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all of those stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by the Adviser to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the Index, or on U.S. securities, or options on those futures, in lieu of investment directly in debt securities. The Fund might do so, for example, in order to increase its investment exposure pending investment

2

in debt securities. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or enter into swap transactions, to assist in matching the performance of the Index.

Principal Risks.

- Stock values could decline generally or could under-perform other investments.

- Because the Russell 2000 Index includes primarily stocks of small-capitalization ("small-cap") companies, the Equity 2000 Index Fund's investments consist mainly of stocks of small-cap companies. Returns on investments in stocks of small U.S. companies could be more volatile than, or trail the returns on, investments in stocks of larger or medium capitalization ("large-cap" and "mid-cap," respectively) companies. Small companies may be more likely than mid-cap and large-cap companies to have relatively limited product lines, markets or financial resources, or depend on a few key employees.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the return on the securities and other investments selected by the Adviser may not correlate precisely with the return on the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to match the performance of the Index may not correlate precisely with the return on the Index.

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its investment objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Information.

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus.

FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its

3

own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                                   0.10%

Distribution (12b-1) Fees                            0.25%

Other Expenses                                       0.10%
                                                     -----
Total Annual Fund Operating Expenses                 0.45%

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. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year                      3 years
------                      -------
$46                         $145

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The Russell 2000 Index. The Russell 2000 Index is composed of 2000 common stocks, which are selected by Frank Russell Company ("Russell"), based upon market capitalization. Each year on May 31st, Russell ranks the 3,000 largest U.S. stocks by market capitalization in order to create the Russell 3000 Index, which represents approximately 98% of the total U.S. equity market. After the initial list of 3,000 eligible stocks is determined, the shares outstanding for each company are adjusted for corporate cross-ownership and large private holdings. The Russell 2000 Index is a subset of the Russell 3000 Index, representing the smallest 2000 stocks of the Russell 3000 Index. The purpose of the Russell 2000 Index is to provide a comprehensive representation of the investable U.S. small-capitalization equity market. The inclusion of a stock in the Russell 2000 Index in no way implies that Russell believes the stock to be an attractive investment, nor is Russell a sponsor or in any way affiliated with the Fund. The securities in the Russell 2000 Index, most of which trade on the New York Stock Exchange and NASDAQ, represent approximately 8% of the market value of all U.S. common stocks. The Index only includes common stocks domiciled in the United States and its territories.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts on the Index and options on those futures contracts. An "index futures" contract is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending


(1) This fee represents the total fees paid by the corresponding Portfolio of State Street Master Funds.

4

on the change in value of the index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Index Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

REITs. The Fund may invest in real estate investment trusts, known as "REITs". REITs involve certain special risks in addition to those risks associated with investing in the real estate industry in general (such as possible declines in the value of real estate, lack of availability of mortgage funds or extended vacancies of property). Equity REITs may be affected by changes in the value of the underlying property owned by the REITs, while mortgage REITs may be affected by the quality of any credit extended. REITs are dependent upon management skills, are subject to heavy cash flow dependency, risks of default by borrowers, and self-liquidation. REITs are also subject to the possibilities of failing to qualify for tax-free pass-through of income under the Internal Revenue Code, and failing to maintain their exemptions from registration under the 1940 Act. Investing in REITs involves risks similar to those associated with investing in small capitalization companies. REITs may have limited financial resources, may trade less frequently and in limited volume and may be subject to more volatility than other investments.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

5

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

MANAGEMENT AND ORGANIZATION

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser, pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street") is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.10% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for

6

the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending agent would typically receive a portion of the net investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio, the Fund would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the New York Stock Exchange (the "NYSE") is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in this Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. Investments in the Fund may not be transferred. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12B-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's shares and for

7

services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.25%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains of the Fund will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

8

For more information about STATE STREET EQUITY 2000 INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders after the Fund has been in existence for a calendar year. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

9

State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET MSCI(R) EAFE(R) INDEX FUND

Prospectus Dated April 30, 2002

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

1

INTRODUCTION

The State Street MSCI EAFE Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Morgan Stanley Capital International (MSCI(R)) Europe, Australiasia, Far East (EAFE(R)) Index (the "MSCI EAFE Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust (the "Trust"), which is an open-end management investment company organized under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

Investment Objective. The Fund's investment objective is to match as closely as possible, before expenses, the performance of the MSCI EAFE Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

Principal Investment Strategies. The Fund is not managed according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Fund, using a "passive" or "indexing" investment approach, attempts to replicate, before expenses, the performance of the MSCI EAFE Index. The MSCI EAFE Index is a well-known international stock market index that includes approximately 1,000 securities listed on the stock exchanges of 21 developed market countries (but not the United States). The Adviser seeks a correlation of 0.95 or better between the Fund's performance and the performance of the Index (1.00 would represent perfect correlation).

The Fund may invest in all of the stocks comprising the Index in proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all of those stocks in those weightings. In those circumstances, the Fund may purchase a sample of the stocks in the Index in proportions expected by the Adviser to match generally the performance of the Index as a whole. In addition, from time to time stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.

2

In addition, the Fund may at times purchase or sell futures contracts on the Index, or options on those futures, in lieu of investment directly in the stocks making up the Index. The Fund might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Fund might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or enter into swap transactions, to assist in matching the performance of the Index.

Principal Risks.

- Stock values could decline generally or could under-perform other investments.

- Returns on investments in foreign stocks could be more volatile than, or trail the returns on, investments in U.S. stocks.

- Foreign investments are subject to a variety of risks not associated with investing in the United States, including currency fluctuations, economic or financial instability, lack of timely or reliable information, and unfavorable political or legal developments.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to replicate the performance of the Index may not correlate precisely with the return on the Index.

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its investment objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Information.

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus.

FEES AND EXPENSES

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues

3

to pay its own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                                   0.15%

Distribution (12b-1) Fees                            0.25%

Other Expenses                                       0.10%

Total Annual Fund Operating Expenses                 0.50%

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. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year                             3 years
------                             -------
 $51                                $161

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The MSCI EAFE Index. The MSCI EAFE Index is an arithmetic, capitalization-weighted average of the performance of approximately 1,000 securities listed on the stock exchanges of the countries (other than the United States) determined by MSCI(R) to be "developed." Although the list of developed markets may change over time, at the date of this prospectus, these included:
Australia, Austria, Belgium, Denmark, Finland, France, Germany, Greece, Hong Kong, Ireland, Italy, Japan, Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland, and the United Kingdom. The designation of a market as "developed" by MSCI(R) arises from several factors, the most common of which is minimum gross domestic product per capita. The MSCI EAFE Index is structured to represent the opportunities available to an international investor in developed markets. MSCI(R) targets 85% of the available market capitalization of each country for inclusion in the Index. Securities selected by MSCI(R) for inclusion in the Index must have acceptable levels of liquidity and free float. MSCI(R) also avoids inclusion of companies that have a significant ownership stake in another company since substantial cross-ownership can skew industry weights, distort country-level valuations and overstate a country's true market size. The inclusion of a stock in the MSCI


(1) This fee represents the total expenses of the corresponding Portfolio of State Street Master Funds.

4

EAFE Index in no way implies that MSCI(R) believes the stock to be an attractive investment, nor is MSCI(R) a sponsor or in any way affiliated with the Fund. The MSCI EAFE Index is the exclusive property of MSCI(R). Morgan Stanley Capital International(R) is a service mark of MSCI(R) and has been licensed for use by the Trust.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts on the Index and options on those futures contracts. An "index futures" contract is a contract to buy or sell units of an Index at an agreed price on a specified future date. Depending on the change in value of the index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the Index. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Index Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

MANAGEMENT AND ORGANIZATION

5

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc. serves as the investment adviser to the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street") is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.10% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending agent would typically receive a portion of the net investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio, the Fund

6

would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the New York Stock Exchange (the "NYSE") is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in this Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax advisor regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12B-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's shares and for services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.25%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

7

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains of the Fund will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

The Fund's investments in foreign securities may be subject to foreign withholding taxes. In that case, the Fund's yield on those securities would be decreased. Shareholders may be entitled to claim a credit or deduction with respect to foreign taxes. In addition, the Fund's investments in foreign securities or foreign currencies may increase or accelerate the Fund's recognition of ordinary income and may affect the timing or amount of the Fund's distributions.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

8

For more information about STATE STREET MSCI EAFE INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders after the Fund has been in existence for a calendar year. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

9

State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET AGGREGATE BOND INDEX FUND

Prospectus Dated April 30, 2002

The Securities and Exchange Commission has not approved or disapproved these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is a criminal offense.

1

INTRODUCTION

The State Street Aggregate Bond Index Fund (the "Fund") is a mutual fund that seeks to provide an investment return matching, as closely as possible before expenses, the performance of the Lehman Brothers Aggregate Bond Index (the "LBAB Index" or the "Index"). The Fund is a series of the State Street Institutional Investment Trust, which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

RISK/RETURN SUMMARY

Investment Objective. The Fund's investment objective is to match as closely as possible, before expenses, the performance of the LBAB Index. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in a corresponding portfolio (the "Portfolio") of State Street Master Funds that has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and policies of the Fund below, you should assume that the investment objective and policies of the Portfolio are the same in all material respects as those of the Fund (and that, at times when the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio). There is no assurance that the Fund will achieve its investment objective.

Principal Investment Strategies. The Fund uses a management strategy designed to track the performance of the LBAB Index. The LBAB Index is a well-known fixed-income securities index, which emphasizes U.S. government securities, mortgage-backed securities and corporate investment-grade debt securities.

The Adviser seeks to track the performance of the LBAB Index by investing in debt securities and other investments that are representative of the LBAB Index as a whole. Due to the large number of securities in the LBAB Index and the fact that certain Index securities are unavailable for purchase, complete replication is not possible. Rather, the Fund intends to select securities that the Adviser believes will track the LBAB Index in terms of industry weightings, market capitalization and other characteristics.

The Fund may make direct investments in U.S. government securities; corporate debt securities; mortgage-backed and other asset-backed securities; commercial paper, notes, and bonds issued by domestic and foreign corporations; instruments of U.S. and foreign banks, including certificates of deposit, time deposits, letters of credit, and bankers' acceptances; and swap agreements. Securities in which the Fund invests may be fixed-income securities, zero-coupon securities, or variable rate securities.

In addition, the Fund may at times purchase or sell futures contracts and options on the LBAB Index (or other fixed-income securities indices), if and when they become available. The Fund might do so, for example, in order to adjust the interest-rate sensitivity of the Fund to bring

2

it more closely in line with that of the Index. It might also do so to increase its investment exposure pending investment of cash in the bonds comprising the Index or to reduce its investment exposure in situations where it intends to sell a portion of the securities in its portfolio but the sale has not yet been completed. The Fund may also, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Fund. The Fund may also enter into other derivatives transactions, including the purchase or sale of options or entering into swap transactions, to assist in matching the performance of the Index.

Principal Risks.

- Values of fixed-income securities could decline generally in response to changes in interest rates or other factors. In general, the price of a fixed-income security may fall when interest rates rise and may rise when interest rates fall. Securities with longer maturities may be more sensitive to interest rate changes than securities with shorter maturities are.

- Returns on investments in fixed-income securities could trail the returns on other investment options, including investments in equity securities.

- Issuers of the Fund's investments may not make timely payments of interest and principal or may fail to make such payments at all.

- The Fund's return may not match the return of the Index for a number of reasons. For example, the return on the securities and other investments selected by the Adviser may not correlate precisely with the return on the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. The Fund may not be fully invested at times, either as a result of cash flows into the Fund or reserves of cash held by the Fund to meet redemptions. The return on the sample of stocks purchased by the Adviser, or futures or other derivative positions taken by the Adviser, to replicate the performance of the Index may not correlate precisely with the return of the Index.

The Fund's shares will change in value, and YOU COULD LOSE MONEY BY INVESTING IN THE FUND. The Fund may not achieve its investment objective. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Information.

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus.

FEES AND EXPENSES

3

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in a Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                                       0.10%

Distribution (12b-1) Fees                                0.25%

Other Expenses                                           0.10%
                                                         -----
Total Annual Fund Operating Expenses                     0.45%

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. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year                                      3 years
------                                      -------
 $46                                         $145

OTHER INVESTMENT CONSIDERATIONS AND RISKS

The LBAB Index. The LBAB Index is a well-known bond market index that covers the U.S. investment-grade fixed-income bond market, including government, corporate, mortgage-backed and asset-backed bonds, all with maturities of over one year. As of March 31, 2002, the average duration of the LBAB Index was 4.64 years. Bonds in the LBAB Index are weighted according to their market capitalizations. The composition of the Index is determined by Lehman Brothers Holdings, Inc. ("Lehman Brothers") and is based on such factors as the market capitalization of each bond, its remaining time to maturity and quality rating as determined by Moody's Investor Securities, Inc., an outside ratings agency, and may be changed from time to time. The Fund is not sponsored, endorsed, sold, or promoted by Lehman Brothers, and Lehman Brothers makes no representation regarding the advisability of investing in the Fund.

Debt Securities. The values of debt securities generally rise and fall inversely with changes in interest rates. Interest rate risk is usually greater for debt securities with longer maturities. The Fund's investments will normally include debt securities with longer maturities, although the Adviser will seek to ensure that the maturity characteristics of the Fund as a whole will generally be similar to those of the LBAB Index. Mortgage-backed and asset-backed


(1) This fee represents the total expenses of the corresponding Portfolio of State Street Master Funds.

4

securities are also subject to increased interest rate risk, because prepayment rates on such securities typically increase as interest rates decline and decrease as interest rates rise. Changes in prepayment rates on mortgage-backed and asset-backed securities effectively increase and decrease the Fund's average maturity when that is least desirable. The Fund will also be subject to credit risk (the risk that the issuer of a security will fail to make timely payments of interest and principal).

Futures Contracts and Related Options. The Fund may buy and sell futures contracts on securities contained in the LBAB Index and options on those futures contracts. A "futures contract" on debt securities (such as U.S. Treasury securities) is a contract to buy or sell units of an index at an agreed price on a specified future date. Depending on the change in value of the Index between the time when the Fund enters into and terminates an index future or option transaction, the Fund realizes a gain or loss. Options and futures transactions involve risks. For example, it is possible that changes in the prices of futures contracts on the Index will not correlate precisely with changes in the value of the underlying security. In those cases, use of futures contracts and related options might decrease the correlation between the return of the Fund and the return of the LBAB Index. In addition, the Fund incurs transaction costs in entering into, and closing out, positions in futures contracts and related options. These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the LBAB Index.

Other Derivative Transactions. The Fund may enter into derivatives transactions involving options and swaps. These transactions involve many of the same risks as those described above under "Futures Contracts and Related Options." In addition, since many of such transactions are conducted directly with counterparties, and not on an exchange or board of trade, the Fund's ability to realize any investment return on such transactions may be dependent on the counterparty's ability or willingness to meet its obligations.

Repurchase Agreements and Securities Loans. The Fund may enter into repurchase agreements and securities loans. Under a repurchase agreement, the Fund purchases a debt instrument for a relatively short period (usually not more than one week), which the seller agrees to repurchase at a fixed time and price, representing the Fund's cost plus interest. Under a securities loan, the Fund lends portfolio securities. The Fund will enter into repurchase agreements and securities loans only with commercial banks and with registered broker-dealers who are members of a national securities exchange or market makers in government securities, and in the case of repurchase agreements, only if the debt instrument is a U.S. government security. Although the Adviser will monitor these transactions to ensure that they will be fully collateralized at all times, the Fund bears a risk of loss if the other party defaults on its obligation and the Fund is delayed or prevented from exercising its rights to dispose of the collateral. If the other party should become involved in bankruptcy or insolvency proceedings, it is possible that the Fund may be treated as an unsecured creditor and be required to return the underlying collateral to the other party's estate.

Changes in Policies. The Trust's Trustees may change the Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Trustees will not materially change the Fund's investment objective without shareholder approval.

5

MANAGEMENT AND ORGANIZATION

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser, pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940 (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street") is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent (and for assuming ordinary operating expenses of the Fund, including ordinary legal and audit expenses), State Street receives a fee at an annual rate of 0.10% of average daily net assets of the Fund.

The Lending Agent. State Street may serve as the lending agent for the Trust. In such capacity, it would cause the delivery of loaned securities from the Fund to borrowers, arrange for the return of loaned securities to the Fund at the termination of loans, request deposit of collateral, monitor daily the value of the loaned securities and collateral, request that borrowers add to the collateral when required by the loan agreements, and provide record-keeping and accounting services necessary for the operation of the program. For its services, the lending

6

agent would typically receive a portion of the net investment income, if any, earned on the collateral for the securities loaned. (At any time when the Fund invests in the Portfolio, the Fund would not likely engage directly in securities lending activities; State Street serves as lending agent for the Portfolio on the same terms.)

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund's net asset value is calculated on each day the New York Stock Exchange (the "NYSE") is open as of the close of regular trading on the NYSE. The net asset value is based on the market value of the securities held in the Fund. The net asset value per share is calculated by dividing the value of the net asset value of the Fund by the number of shares outstanding. If quotations are not readily available, the portfolio securities will be valued by methods approved by the Trustees intended to reflect fair value.

Purchasing Shares. Investors pay no sales load to invest in this Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12B-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's shares and for services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.25%. Because these fees are paid out of the Fund's assets on an

7

ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

Dividends and capital gains of the Fund will be declared and paid annually.

For federal income tax purposes, distributions of investment income are taxable as ordinary income. Taxes on distributions of capital gains are determined by how long the Fund owned the investments that generated them, rather than how long you have owned your shares. Distributions are taxable to you even if they are paid from income or gains earned by the Fund before your investment (and thus were included in the price you paid). Distributions of gains from investments that the Fund owned for more than one year will be taxable as capital gains (generally at a 20% rate for noncorporate shareholders). Distributions of gains from investments that the Fund owned for one year or less will be taxable as ordinary income. Distributions are taxable whether you received them in cash or reinvested them in additional shares.

Any gain resulting from the sale or exchange of your shares will generally also be subject to tax. You should consult your tax advisor for more information on your own tax situation, including possible foreign, state and local taxes.

8

For more information about STATE STREET AGGREGATE BOND INDEX FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders after the Fund has been in existence for a calendar year. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

9

State Street Institutional Investment Trust

P.O. Box 5049, Boston, Massachusetts 02206

STATE STREET MONEY MARKET FUND

Prospectus Dated April 30, 2002

THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THESE SECURITIES OR PASSED UPON THE ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

AN INVESTMENT IN THE STATE STREET MONEY MARKET FUND IS NOT INSURED OR GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY.

THE FUND SEEKS TO MAXIMIZE CURRENT INCOME, TO THE EXTENT CONSISTENT WITH THE PRESERVATION OF CAPITAL AND LIQUIDITY AND THE MAINTENANCE OF A STABLE $1.00 PER

SHARE NET ASSET VALUE, BY INVESTING IN DOLLAR DENOMINATED SECURITIES. THERE IS NO GUARANTEE THE FUND WILL BE ABLE TO MAINTAIN A STABLE NET ASSET VALUE PER SHARE.

1

INTRODUCTION

The State Street Money Market Fund (the "Fund") is a mutual fund that seeks to maximize current income, to the extent consistent with the preservation of capital and liquidity and the maintenance of a stable $1.00 per share net asset value ("NAV"), by investing in dollar denominated securities. The Fund is a series of the State Street Institutional Investment Trust (the "Trust"), which is an open-end management investment company organized as a business trust under the laws of the Commonwealth of Massachusetts. SSgA Funds Management, Inc. (the "Adviser"), a subsidiary of State Street Corporation, is the investment adviser to the Fund and to the portfolio in which it invests.

PRINCIPAL INVESTMENT STRATEGIES

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the State Street Money Market Portfolio (the "Portfolio") of State Street Master Funds, which has the same investment objective as, and investment policies that are substantially similar to those of, the Fund. In reviewing the investment objective and strategies of the Fund below, you should assume that the investment objective and strategies of the Portfolio are the same in all material respects as those of the Fund and that, so long as the Fund has invested its assets in the Portfolio, the descriptions below of the Fund's investment strategies and risks should be read as also applicable to the Portfolio.

The Fund attempts to meet its investment objective by investing in high-quality money market instruments. Such instruments include: (1) U.S. Treasury bills, notes and bonds; (2) other obligations issued or guaranteed as to interest and principal by the U.S. Government, its agencies, or instrumentalities; (3) instruments of U.S. and foreign banks, including certificates of deposit, bankers' acceptances and time deposits, including Eurodollar Certificates of Deposit ("ECDs"), Eurodollar Time Deposits ("ETDs") and Yankee Certificates of Deposit ("YCDs"); (4) commercial paper of U.S. and foreign companies; (5) asset-backed securities; (6) corporate obligations of U.S. and foreign companies; (7) variable and floating rate notes; and (8) repurchase agreements.

The Adviser bases its decisions on the relative attractiveness of different money market investments which can vary depending on the general level of interest rates as well as supply/demand imbalances in the market.

PRINCIPAL RISKS OF INVESTING IN THE FUND

- Money Market Risk. The risk that the Fund will not be able to maintain a NAV per share of $1.00 at all times. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

2

- Interest Rate Risk. The risk that during periods of rising interest rates, the Fund's yield (and the market value of its securities) will tend to be lower than prevailing market rates; in periods of falling interest rates, the Fund's yield will tend to be higher.

- Credit/Default Risk. The risk that an issuer of fixed-income securities held by the Fund (which may have low credit ratings) may default on its obligation to pay interest and repay principal. There is also a risk that one or more of the securities will be downgraded in credit rating and generally, lower rated bonds have higher credit risks.

- Government Securities Risk. The risk that the U.S. government will not provide financial support to U.S. government agencies, instrumentalities or sponsored enterprises if it is not obligated to do so by law.

- Foreign Risk. The risk that a foreign security could lose value as a result of political, financial and economic events in foreign countries, less stringent foreign securities regulations and accounting and disclosure standards, or other factors.

- Banking Industry Risk. The risk that if the Fund invests more than 25% of its total assets in bank obligations, an adverse development in the banking industry may affect the value of the Fund's investments more than if the Fund's investments were not invested to such a degree in the banking industry. Normally, the Fund intends to invest more than 25% of its total assets in bank obligations. Banks may be particularly susceptible to certain economic factors such as interest rate changes, adverse developments in the real estate market, fiscal and monetary policy and general economic cycles.

- Sector Risk. The risk that the Fund concentrates its investment in specific industry sectors that have historically experienced substantial price volatility. The Fund is subject to greater risk of loss as a result of adverse economic, business or other developments than if its investments were diversified across different industry sectors.

- Liquidity Risk. The risk that the Fund will be unable to pay proceeds within the time period stated in this prospectus because of unusual market conditions, an unusually high volume of redemption requests, or other reasons.

PERFORMANCE INFORMATION

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus.

FEES AND EXPENSES

The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. As a shareholder in the Portfolio, the Fund bears its ratable share of the Portfolio's expenses, including advisory and administrative fees, and at the same time continues to pay its own fees and expenses. The table and the Example reflect the expenses of both the Fund and the Portfolio.

3

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

Management Fees(1)                               0.19%
Distribution (12b-1) Fees                        0.05%
Other Expenses                                   0.08%
                                                 -----
Total Annual Fund Operating Expenses             0.32%
                                                 =====

Example: This Example is intended to help you compare the cost of investing in the Fund with the costs of investing in other mutual funds. It assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions yours costs would be:

1 year                       3 years
------                       -------
  $26                          $81

MANAGEMENT AND ORGANIZATION

The Fund and the Portfolio. State Street Institutional Investment Trust is an open-end management investment company. It was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000. The Fund is a separate diversified series of the Trust. The Portfolio in which the Fund invests is managed under the general oversight of the Board of Trustees of State Street Master Funds. SSgA Funds Management, Inc., a subsidiary of State Street Corporation, serves as the investment adviser for the Portfolio.

The Trustees of the Fund are responsible for generally overseeing the investments of the Fund's shares. If the Adviser were to invest the Fund's assets directly, it would, subject to such policies as the Trustees may determine, furnish a continuing investment program for the Fund and make investment decisions on its behalf.

The Adviser. The Fund has entered into an investment advisory agreement with the Adviser pursuant to which the Adviser would manage the Fund's assets directly in the event that the Fund were to cease investing substantially all of its assets in the Portfolio. The Adviser does not receive any fees from the Fund under that agreement so long as the Fund continues to invest substantially all of its assets in the Portfolio or in another investment company.

The Adviser places all orders for purchases and sales of the Fund's (or the underlying Portfolio's) investments. In selecting broker-dealers, the Adviser may consider research and brokerage services furnished to it and its affiliates. Affiliates of the Adviser may receive


(1) This fee represents the total expenses of the corresponding Portfolio of State Street Master Funds.

4

brokerage commissions from the Fund or Portfolio in accordance with procedures adopted by the Trustees under the Investment Company Act of 1940, as amended (the "1940 Act"), which require periodic review of these transactions.

As of December 31, 2001, the Adviser managed approximately $57 billion in assets and, together with its affiliates managed approximately $775 billion in assets. The Adviser's principal address is Two International Place, Boston, Massachusetts 02110.

The Administrator, Custodian, Transfer and Dividend Disbursing Agent. State Street Bank and Trust Company ("State Street"), a subsidiary of State Street Corporation, is the Administrator for the Fund and the Custodian for the Fund's assets, and serves as the Transfer Agent to the Fund. As compensation for its services as Administrator, Custodian and Transfer Agent, State Street receives a fee at an annual rate of 0.05% of average daily net assets of the Fund.

ADDITIONAL INFORMATION ABOUT THE FUND'S OBJECTIVES, INVESTMENT STRATEGIES AND RISKS

The investment objective of the Fund as stated above may be changed without shareholder approval. The investment policies described below reflect the Fund's current practices. In addition to the principal risks explained above, other risks are explained in some of the descriptions of the investment policies below:

Quality of Securities. The Fund will limit its portfolio investments to those United States dollar-denominated instruments which at the time of acquisition the Adviser determines present minimal credit risk and which qualify as "eligible" securities under the Securities and Exchange Commission ("SEC") rules applicable to money market mutual funds. In general, eligible securities include securities that: (1) are rated in the highest category by at least two nationally recognized statistical rating organizations ("NRSRO"); (2) by one NRSRO, if only one rating service has rated the security; or (3) if unrated, are of comparable quality, as determined by the Adviser in accordance with procedures established by the Board of Trustees.

Portfolio Maturity. A money market fund must limit its investments to securities with remaining maturities determined in accordance with applicable SEC regulations and must maintain a dollar-weighted average maturity of 90 days or less. The Fund will normally hold portfolio instruments to maturity, but may dispose of them prior to maturity if the Adviser finds it advantageous or necessary. Investing in short-term money market instruments will result in high portfolio turnover. Since the cost of these transactions is small, high turnover is not expected to adversely affect the Fund's price or yield.

Variable and Floating Rate Securities. The Fund may purchase variable and floating rate securities which are instruments issued or guaranteed by entities such as the: (1) U.S. government, or an agency or instrumentality thereof, (2) corporations, (3) financial institutions or (4) insurance companies. A variable rate security provides for the automatic establishment of a

5

new interest rate on set dates. Variable rate obligations whose interest is readjusted no less frequently than annually will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate. The Fund may also purchase floating rate securities. A floating rate security provides for the automatic adjustment of its interest rate whenever a specified interest rate changes. Interest rates on these securities are ordinarily tied to, and are a percentage of, a widely recognized interest rate, such as the yield on 90-day U.S. Treasury bills or the prime rate of a specified bank. Generally, changes in interest rates will have a smaller effect on the market value of variable and floating rate securities than on the market value of comparable fixed-income obligations. Thus, investing in variable and floating rate securities generally allows less opportunity for capital appreciation and depreciation than investing in comparable fixed-income securities.

Asset-Backed Securities. Asset-backed securities are securities whose principal and interest payments are collateralized by pools of assets such as auto loans, credit card receivables, leases, installment contracts and personal property. Payments of principal and interest are passed through to holders of the securities and are typically supported by some form of credit enhancement, such as over collateralization, a letter of credit, surety bond, limited guarantee by another entity or by priority to certain of the borrower's other securities. The degree of credit enhancement varies, generally applying only until exhausted and covering only a fraction of the security's par value. If the credit enhancement of an asset-backed security held by the Fund has been exhausted, and if any required payments of principal and interest are not made with respect to the underlying loans, the Fund may experience loss or delay in receiving payment and a decrease in the value of the security.

- Prepayment Risk - Like mortgage-backed securities, asset-backed securities are often subject to more rapid repayment than their stated maturity date would indicate as a result of the pass-through of prepayments of principal on the underlying loans. During periods of declining interest rates, prepayment of loans underlying asset-backed securities can be expected to accelerate. The Fund's ability to maintain positions in such securities will be affected by reductions in the principal amount of such securities resulting from prepayments, and its ability to reinvest the returns of principal at comparable yields is subject to generally prevailing interest rates at that time. To the extent that the Fund invests in asset-backed securities, the values of the Fund's portfolio securities will vary with changes in market interest rates generally and the differentials in yields among various kinds of asset-backed securities.

- Other Risk Associated with Asset-Backed Securities - Asset-backed securities present certain additional risks that are not presented by mortgage-backed securities because asset-backed securities generally do not have the benefit of a security interest in collateral that is comparable to mortgage assets. Credit card receivables are generally unsecured and the debtors on such receivables are entitled to the protection of a number of state and federal consumer credit laws, many of which give such debtors the right to set-off certain amounts owed on the credit cards, thereby reducing the balance due. Automobile receivables generally are secured, but by automobiles rather than residential real property. Most issuers of automobile receivables permit the loan servicers to retain possession of the underlying obligations. If the servicer were to sell these obligations to another party, there

6

is a risk that the purchaser would acquire an interest superior to that of the holders of the asset-backed securities. In addition, because of the large number of vehicles involved in a typical issuance and technical requirements under state laws, the trustee for the holders of the automobile receivables may not have a proper security interest in the underlying automobiles. Therefore, there is the possibility that, in some cases, recoveries on repossessed collateral may not be available to support payments on these securities.

U.S. Government Securities. U.S. Government securities include U.S. Treasury bills, notes and bonds and other obligations issued or guaranteed as to interest and principal by the U.S. Government, its agencies or instrumentalities. Obligations issued or guaranteed as to interest and principal by the U.S. Government, its agencies or instrumentalities include securities that are supported by the full faith and credit of the United States Treasury, securities that are supported by the right of the issuer to borrow from the United States Treasury, discretionary authority of the U.S. Government agency or instrumentality, and securities supported solely by the creditworthiness of the issuer.

Eurodollar Certificates of Deposit (ECDs), Eurodollar Time Deposits (ETDs) and Yankee Certificates of Deposit (YCDs). ECDs are U.S. dollar denominated certificates of deposit issued by a bank outside of the United States. ETDs are U.S. dollar denominated deposits in foreign branches of U.S. banks and foreign banks. YCDs are U.S. dollar denominated certificates of deposit issued by U.S. branches of foreign banks. Different risks than those associated with the obligations of domestic banks may exist for ECDs, ETDs and YCDs. The banks issuing these instruments, or their domestic or foreign branches, are not necessarily subject to the same regulatory requirements that apply to domestic banks. Foreign laws and accounting standards typically are not as strict as they are in the U.S. and therefore there may be fewer restrictions regarding loan limitations, less frequent examinations and less stringent requirements regarding reserve accounting, auditing, recordkeeping and public reporting requirements.

Section 4(2) Commercial Paper. The Fund may also invest in commercial paper issued in reliance on the so-called private placement exemption from registration afforded by Section 4(2) of the Securities Act of 1933, as amended ("Section 4(2) paper"). Section 4(2) paper is restricted as to disposition under the Federal securities laws and generally is sold to institutional investors that agree that they are purchasing the paper for investment and not with a view to public distribution. Any resale by the purchaser must be in an exempt transaction. Section 4(2) paper normally is resold to other institutional investors like the Fund through or with the assistance of the issuer or investment dealers that make a market in Section 4(2) paper. As a result it suffers from a liquidity risk, the risk that the securities may be difficult to value because of the absence of an active market and may be disposed of only after considerable expense and delay. Section 4(2) paper will not be subject to the Fund's 10% limitation on illiquid securities set forth in the Fund's Statement of Additional Information where the Board of Trustees of the Trust (pursuant to guidelines adopted by the Board) determines that a liquid trading market exists.

SHAREHOLDER INFORMATION

Determination of Net Asset Value. The Fund determines the price per share once each business day at 3:00 p.m. Eastern time or the close of the New York Stock Exchange (the

7

"NYSE"), whichever is earlier. Pricing does not occur on NYSE holidays. A business day is one on which the NYSE or Boston Federal Reserve are open for regular trading. The price per share for the Fund is computed by adding the value of all securities and other assets of the Fund, deducting accrued liabilities, dividing by the number of shares outstanding and rounding to the nearest cent.

The Fund seeks to maintain a $1.00 per share net asset value and, accordingly, uses the amortized cost valuation method to value its portfolio instruments. The amortized cost valuation method initially prices an instrument at its cost and thereafter assumes a constant amortization to maturity of any discount or premium, regardless of the impact of fluctuating interest rates on the market value of the instrument.

Purchasing Shares. Investors pay no sales load to invest in the Fund. The price for Fund shares is the net asset value per share. Orders will be priced at the net asset value next calculated after the order is accepted by the Fund.

The minimum initial investment in the Fund is $25 million, although the Adviser may waive the minimum in its discretion. There is no minimum subsequent investment. The Fund intends to be as fully invested as is practicable; therefore, investments must be made either in Federal Funds (i.e., monies credited to the account of the Fund's custodian bank by a Federal Reserve Bank) or securities acceptable to the Adviser. (Please consult your tax adviser regarding in-kind transactions.) The Fund reserves the right to cease accepting investments at any time or to reject any investment order.

Redeeming Shares. An investor may withdraw all or any portion of its investment at the net asset value next determined after it submits a withdrawal request, in proper form, to the Fund. The Fund will pay the proceeds of the withdrawal either in Federal Funds or in securities ("in-kind") at the discretion of the Adviser, normally on the next Fund business day after the withdrawal, but in any event no more than seven days after the withdrawal. (Please consult your tax adviser regarding in-kind transactions.) At the request of an investor, the Fund will normally redeem in-kind to the investor. The right of any investor to receive payment with respect to any withdrawal may be suspended or the payment of the withdrawal proceeds postponed during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or, to the extent otherwise permitted by the 1940 Act, if an emergency exists.

DISTRIBUTION/SERVICING (RULE 12b-1) PLAN

The Fund has adopted a distribution plan under which the Fund may compensate its distributor (or others) for services in connection with the distribution of the Fund's shares and for services provided to Fund shareholders. The plan calls for payments at an annual rate (based on average daily net assets) of 0.05%. Because these fees are paid out of the Fund's assets on an ongoing basis, they will increase the cost of your investment and may cost you more over time than paying other types of sales charges.

DIVIDENDS, DISTRIBUTIONS AND TAX CONSIDERATIONS

8

The Fund intends to declare dividends on shares from net investment income daily and have them payable as of the last business day of each month. Distributions will be made at least annually from net short- and long-term capital gains, if any. In most instances, distributions will be declared and paid in mid-October with additional distributions declared and paid in December, if required, for the Fund to avoid imposition of a 4% federal excise tax on undistributed capital gains. The Fund does not expect any material long-term capital gains or losses.

Dividends from net investment income and distributions of net short-term capital gains are taxable to you as ordinary income under federal income tax laws whether paid in cash or in additional shares. Distributions from net long-term gains are taxable as long-term gains regardless of the length of time you have held the shares and whether you were paid in cash or additional shares.

9

For more information about STATE STREET MONEY MARKET FUND:

The Fund's statement of additional information (SAI) includes additional information about the Fund and is incorporated by reference into this document. Additional information about the Fund's investments will be available in the Fund's annual and semi-annual reports to shareholders after the Fund has been in existence for a calendar year. In the Fund's annual report, you will find a discussion of the market conditions and investment strategies that significantly affected the Fund's performance during its last fiscal year.

The SAI and the Fund's annual and semi-annual reports are available, without charge, upon request. Shareholders in the Fund may make inquiries to the Fund to receive such information by calling the customer service center at the telephone number shown in the accompanying Contract prospectus.

Information about the Fund (including the SAI) can be reviewed and copied at the Commission's Public Reference Room in Washington, D.C. Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-942-8090. Reports and other information about the Fund are available free of charge on the EDGAR Database on the Commission's Internet site at http://www.sec.gov; copies of this information also may be obtained, after paying a duplicating fee, by electronic request at the following E-mail address:
publicinfo@sec.gov, or by writing the Commission's Public Reference Section, Washington, D.C. 20549-0102.

SSgA FUNDS MANAGEMENT, INC.
TWO INTERNATIONAL PLACE
BOSTON, MASSACHUSETTS 02109

The State Street Institutional Investment Trust's Investment Company Act File Number is 811-9819.

10

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET EQUITY 500 INDEX FUND

STATE STREET EQUITY 400 INDEX FUND

STATE STREET EQUITY 2000 INDEX FUND

STATE STREET MSCI(R) EAFE(R) INDEX FUND

STATE STREET AGGREGATE BOND INDEX FUND

STATE STREET MONEY MARKET FUND

This following Statement of Additional Information includes additional information about the Funds. The Statement of Additional Information is not a prospectus. To obtain a copy of a Fund's prospectus, please call the customer service center at the telephone number shown in the accompanying Contract prospectus or write the Trust at:

State Street Institutional Investment Trust

P.O. Box 5049

Boston, Massachusetts 02206

This Statement of Additional Information dated April 30, 2002 relates to the Funds' prospectuses dated April 30, 2002.


TABLE OF CONTENTS

Trust History........................................................   3
Description of the Fund and its Investments and Risks................   3
Additional Investments and Risks.....................................   6
Management of the Trust..............................................   21
Control Persons and Principal Holders of Securities..................   24
Investment Advisory and Other Services...............................   25
Brokerage Allocation and Other Practices.............................   28
Capital Stock and Other Securities...................................   29
Purchase, Redemption and Pricing of Shares...........................   29
Taxation of the Fund.................................................   31
Underwriters.........................................................   34
Calculation of Performance Data......................................   34
Financial Statements.................................................   37
Appendix.............................................................   38

2

TRUST HISTORY

The Trust was organized as a business trust under the laws of the Commonwealth of Massachusetts on February 16, 2000.

The Trust is an open-end management investment company. The Trust contains the following diversified series: the State Street Equity 500 Index Fund (the "Equity 500 Index Fund"), the State Street Equity 400 Index Fund (the "Equity 400 Index Fund"), the State Street Equity 2000 Index Fund (the "Equity 2000 Index Fund"), the State Street MSCI(R) EAFE(R) Index Fund (the "MSCI EAFE Index Fund"), the State Street Aggregate Bond Index Fund (the "Aggregate Bond Index Fund") and the State Street Money Market Fund (the "Money Market Fund"). The Equity 500 Index Fund, the Equity 400 Index Fund, the Equity 2000 Index Fund, the MSCI EAFE Index Fund and the Aggregate Bond Index Fund are referred to this statement of additional information (the "SAI") as the "Index Funds." The Index Funds together with the Money Market Fund are referred to in this SAI as the "Funds."

DESCRIPTION OF THE FUNDS AND THEIR INVESTMENTS AND RISKS

Each Fund's prospectus contains information about the investment objective and policies of that Fund. This statement of additional information should only be read in conjunction with the prospectus of the Fund or Funds in which you intend to invest. In addition to the principal investment strategies and the principal risks of the Fund described in the Fund's prospectus, a Fund may employ other investment practices and may be subject to additional risks, which are described below.

Additional Information Concerning the S&P 500 Index

The Equity 500 Index Fund is not sponsored, endorsed, sold or promoted by Standard & Poor's, a division of The McGraw-Hill Companies, Inc. ("S&P"). S&P makes no representation or warranty, express or implied, to the owners of shares of the Equity 500 Index Fund or any member of the public regarding the advisability of investing in securities generally or in the Fund particularly or the ability of the S&P 500 Index to track general stock market performance. S&P's only relationship to the Equity 500 Index Fund is the licensing of certain trademarks and trade names of S&P and of the S&P 500 Index, which is determined, composed and calculated by S&P without regard to the Fund. S&P has no obligation to take the needs of the Equity 500 Index Fund or the owners of shares of the Fund into consideration in determining, composing or calculating the S&P 500 Index. S&P is not responsible for and has not participated in the determination of the price and number of shares of the Equity 500 Index Fund or the timing of the issuance or sale of shares of the Fund, or calculation of the equation by which shares of the Fund are redeemable for cash.

S&P has no obligation or liability in connection with the administration, marketing or trading of shares of the Equity 500 Index Fund. S&P does not guarantee the accuracy or the completeness of the S&P 500 Index or any data included therein and S&P shall have no liability for any errors, omissions or interruptions therein. S&P makes no warranty, express or implied,

3

as to results to be obtained by the Equity 500 Index Fund, owners of shares of the Fund or any other person or entity from the use of the S&P 500 Index or any data included therein. S&P makes no express or implied warranties, and expressly disclaims all warranties of merchantability or fitness for a particular purpose or use with respect to the S&P 500 Index or any data included therein. Without limiting any of the foregoing, in no event shall S&P have any liability for any special, punitive, indirect or consequential damages (including lost profits), even if notified of the possibility of such damages.

Additional Information Concerning the S&P 400 Index

The Equity 400 Index Fund is not sponsored, endorsed, sold or promoted by S&P. S&P makes no representation or warranty, express or implied, to the owners of shares of the Equity 400 Index Fund or any member of the public regarding the advisability of investing in securities generally or in the Fund particularly or the ability of the S&P 400 Index to track general stock market performance. S&P's only relationship to the Equity 400 Index Fund is the licensing of certain trademarks and trade names of S&P and of the S&P 400 Index, which is determined, composed and calculated by S&P without regard to the Equity 400 Index Fund. S&P has no obligation to take the needs of the Equity 400 Index Fund or the owners of shares of the Fund into consideration in determining, composing or calculating the S&P 400 Index. S&P is not responsible for and has not participated in the determination of the price and number of shares of the Equity 400 Index Fund or the timing of the issuance or sale of shares of the Fund, or calculation of the equation by which shares of the Fund are redeemable for cash.

S&P has no obligation or liability in connection with the administration, marketing or trading of shares of the Equity 400 Index Fund. S&P does not guarantee the accuracy or the completeness of the S&P 400 Index or any data included therein and S&P shall have no liability for any errors, omissions or interruptions therein. S&P makes no warranty, express or implied, as to results to be obtained by the Equity 400 Index Fund, owners of shares of the Fund or any other person or entity from the use of the S&P 400 Index or any data included therein. S&P makes no express or implied warranties, and expressly disclaims all warranties of merchantability or fitness for a particular purpose or use with respect to the S&P 400 Index or any data included therein. Without limiting any of the foregoing, in no event shall S&P have any liability for any special, punitive, indirect or consequential damages (including lost profits), even if notified of the possibility of such damages.

Additional Information Concerning the Russell 2000 Index

The Equity 2000 Index Fund is not sponsored, endorsed, promoted by, or in any way affiliated with Frank Russell Company ("Russell"). Russell is not responsible for and has not reviewed the Equity 2000 Index Fund or any associated literature or publications, and Russell makes no representation or warranty, express or implied, as to their accuracy or completeness, or otherwise. Russell reserves the right, at any time and without notice, to alter, amend, terminate or in any way change the Russell 2000 Index. Russell has no obligation to take the needs of any particular fund or its participants or any other product or person into consideration in

4

determining, composing or calculating the Russell 2000 Index. Russell's publication of the Index in no way suggests or implies an opinion by Russell as to the attractiveness or appropriateness of investment in any or all securities upon which the Index is based. Russell makes no representation, warranty or guarantee as to the accuracy, completeness, reliability, or otherwise of the Russell 2000 Index or any data included in the Index. Russell makes no representation or warranty regarding the use, or the results of use, of the Russell 2000 Index or any data included therein, or any security (or combination thereof) comprising the Index. Russell makes no express or implied warranties, and expressly disclaims all warranties of merchantability or fitness for a particular purpose with respect to the Russell 2000 Index or any data or any security (or combination thereof) included therein.

Additional Information Concerning the MSCI(R) EAFE(R) Index

The MSCI EAFE Index Fund is not sponsored, endorsed, sold or promoted by MSCI or any affiliate of MSCI. Neither MSCI, any of its affiliates nor any other party involved in making or compiling the EAFE index makes any representation or warranty, express or implied, to the owners of the MSCI EAFE Index Fund or any member of the public regarding the advisability of investing in funds generally or in the Fund particularly or the ability of the EAFE index to track general stock market performance. MSCI is the licensor of certain trademarks, service marks and trade names of MSCI and of the EAFE index which is determined, composed and calculated by MSCI without regard to the MSCI EAFE Index Fund or the issuer of the Fund. MSCI has no obligation to take the needs of the issuer of this fund or the owners of the MSCI EAFE Index Fund into consideration in determining, composing or calculating the EAFE index. MSCI is not responsible for and has not participated in the determination of the timing of, prices at, or quantities of the MSCI EAFE Index Fund to be issued or in the determination or calculation of the equation by which the Fund is redeemable for cash. Neither MSCI, any of its affiliates nor any other party involved in making or compiling the EAFE index has any obligation or liability to owners of the MSCI EAFE Index Fund in connection with the administration, marketing or trading of the Fund.

ALTHOUGH MSCI SHALL OBTAIN INFORMATION FOR INCLUSION IN OR FOR USE IN THE CALCULATION OF THE INDEXES FROM SOURCES WHICH MSCI CONSIDERS RELIABLE, NEITHER MSCI, ANY OF ITS AFFILIATES NOR ANY OTHER PARTY INVOLVED IN MAKING OR COMPILING THE EAFE INDEX GUARANTEES THE ACCURACY AND/OR THE COMPLETENESS OF THE INDEXES OR ANY DATA INCLUDED THEREIN. NEITHER MSCI, ANY OF ITS AFFILIATES NOR ANY OTHER PARTY INVOLVED IN MAKING OR COMPILING THE EAFE INDEX MAKES ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY LICENSEE, LICENSEE'S CUSTOMERS AND COUNTERPARTIES, OWNERS OF THE FUNDS, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDEXES OR ANY DATA INCLUDED THEREIN IN CONNECTION WITH THE RIGHTS LICENSED HEREUNDER OR FOR ANY OTHER USE. NEITHER MSCI, ANY OF ITS AFFILIATES NOR ANY OTHER PARTY INVOLVED IN MAKING OR COMPILING THE EAFE INDEX SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS OF OR IN CONNECTION WITH THE INDEXES OR ANY DATA INCLUDED THEREIN. FURTHER, NEITHER MSCI, ANY OF ITS AFFILIATES NOR ANY OTHER PARTY INVOLVED IN

5

MAKING OR COMPILING THE EAFE INDEX MAKES ANY EXPRESS OR IMPLIED WARRANTIES, AND MSCI HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE WITH RESPECT TO THE INDEXES AND ANY DATA INCLUDED THEREIN. NEITHER MSCI, ANY OF ITS AFFILIATES NOR ANY OTHER PARTY INVOLVED IN MAKING OR COMPILING THE EAFE INDEX SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS OF OR IN CONNECTION WITH THE INDEXES OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL MSCI OR ANY OTHER PARTY HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL OR ANY OTHER DAMAGES (INCLUDING LOST PROFITS) EVEN IF NOTIFIED OF THE POSSIBILITY OF SUCH DAMAGES.

Additional Information Concerning the Lehman Brothers Aggregate Bond Index

The Aggregate Bond Index Fund is not sponsored, endorsed, sold or promoted by Lehman Brothers Holdings, Inc. ("Lehman Brothers"). Lehman Brothers makes no representation or warranty, express or implied, to the owners of shares of the Aggregate Bond Index Fund or any member of the public regarding the advisability of investing in securities generally or in the Fund particularly or the ability of the LBAB Index to track general performance. Lehman Brothers' only relationship to the Aggregate Bond Index Fund is the licensing of certain trademarks and trade names of Lehman Brothers and of the LBAB Index, which is determined, composed and calculated by Lehman Brothers without regard to the Fund. Lehman Brothers has no obligation to take the needs of the Aggregate Bond Index Fund or the owners of shares of the Fund into consideration in determining, composing or calculating the LBAB Index. Lehman Brothers is not responsible for and has not participated in the determination of the price and number of shares of the Aggregate Bond Index Fund or the timing of the issuance or sale of shares of the Fund.

Lehman Brothers has no obligation or liability in connection with the administration, marketing or trading of shares of the Aggregate Bond Index Fund. Lehman Brothers does not guarantee the accuracy or the completeness of the LBAB Index or any data included therein and Lehman Brothers shall have no liability for any errors, omissions or interruptions therein. Lehman Brothers makes no warranty, express or implied, as to results to be obtained by the Aggregate Bond Index Fund, owners of shares of the Fund or any other person or entity from the use of the LBAB Index or any data included therein. Lehman Brothers makes no express or implied warranties, and expressly disclaims all warranties of merchantability or fitness for a particular purpose or use with respect to the LBAB Index or any data included therein. Without limiting any of the foregoing, in no event shall Lehman Brothers have any liability for any special, punitive, indirect or consequential damages (including lost profits), even if notified of the possibility of such damages.

ADDITIONAL INVESTMENTS AND RISKS

6

To the extent consistent with its investment objective and restrictions, each Fund may invest in the following instruments and use the following techniques.

Cash Reserves

Each Index Fund may hold portions of its assets in short-term debt instruments with remaining maturities of 397 days or less pending investment or to meet anticipated redemptions and day-to-day operating expenses. Short-term debt instruments consist of: (i) short-term obligations of the U.S. government, its agencies, instrumentalities, authorities or political subdivisions; (ii) other short-term debt securities rated at the time of purchase Aa or higher by Moody's Investors Service, Inc. ("Moody's") or AA or higher by Standard & Poor's Rating Group ("S&P") or, if unrated, of comparable quality in the opinion of SSgA Funds Management, Inc. (the "Adviser"); (iii) commercial paper; (iv) bank obligations, including negotiable certificates of deposit, time deposits and bankers' acceptances; and (v) repurchase agreements. At the time am Index Fund invests in commercial paper, bank obligations or repurchase agreements, the issuer or the issuer's parent must have outstanding debt rated Aa or higher by Moody's or AA or higher by S&P or outstanding commercial paper or bank obligations rated Prime-1 by Moody's or A-1 by S&P; or, if no such ratings are available, the instrument must be of comparable quality in the opinion of the Adviser. To the extent that an Index Fund holds the foregoing instruments its ability to track its corresponding Index may be adversely affected.

Futures Contracts and Options on Futures

Each Index Fund may enter into futures contracts on securities in which it may invest or on indices comprised of such securities and may purchase and write call and put options on such contracts.

A financial futures contract is a contract to buy or sell a specified quantity of financial instruments such as U.S. Treasury bills, notes and bonds at a specified future date at a price agreed upon when the contract is made. An index futures contract is a contract to buy or sell specified units of an index at a specified future date at a price agreed upon when the contract is made. The value of a unit is based on the current value of the index. Under such contracts no delivery of the actual securities making up the index takes place. Rather, upon expiration of the contract, settlement is made by exchanging cash in an amount equal to the difference between the contract price and the closing price of the index at expiration, net of variation margin previously paid. Substantially all futures contracts are closed out before settlement date or called for cash settlement. A futures contract is closed out by buying or selling an identical offsetting futures contract. Upon entering into a futures contract, an Index Fund is required to deposit an initial margin with the Custodian for the benefit of the futures broker. The initial margin serves as a "good faith" deposit that an Index Fund will honor its futures commitments. Subsequent payments (called "variation margin") to and from the broker are made on a daily basis as the price of the underlying investment fluctuates.

7

Options on futures contracts give the purchaser the right to assume a position in a futures contract at a specified price at any time before expiration of the option. An Index Fund will not commit more than 5% of the market value of its total assets to initial margin deposits on futures and premiums paid for options on futures.

Illiquid Securities

Each Fund may invest in illiquid securities. Each Index Fund will invest no more than 15% of its net assets, and the Money Market Fund will invest no more than 10% of its net assets, in illiquid securities or securities that are not readily marketable, including repurchase agreements and time deposits of more than seven days' duration. The absence of a regular trading market for illiquid securities imposes additional risks on investments in these securities. Illiquid securities may be difficult to value and may often be disposed of only after considerable expense and delay.

Lending of Fund Securities

Each Fund has the authority to lend portfolio securities to brokers, dealers and other financial organizations in amounts up to 33 1/3% of the total value of its assets. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by a Fund. The Fund would continue to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned, and would receive an additional return that may be in the form of a fixed fee or a percentage of the collateral. The Fund would have the right to call the loan and obtain the securities loaned at any time on notice of not more than five business days. In the event of bankruptcy or other default of the borrower, the Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses including (a) possible decline in the value of collateral or in the value of the securities loaned during the period while the Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights.

Options on Securities and Securities Indices

Each Index Fund may purchase or sell options on securities in which it may invest and on indices that are comprised of securities in which it may invest, subject to the limitations set forth above and provided such options are traded on a national securities exchange or in the over-the-counter market. Options on securities indices are similar to options on securities except there is no transfer of a security and settlement is in cash. A call option on a securities index grants the purchaser of the call, for a premium paid to the seller, the right to receive in cash an amount equal to the difference between the closing value of the index and the exercise price of the option times a multiplier established by the exchange upon which the option is traded. Typically, a call option will be profitable to the holder of the option if the value of the security or the index

8

increases during the term of the option; a put option will be valuable if the value of the security or the index decreases during the term of the option. The Index Funds may also invest in warrants, which entitle the holder to buy equity securities at a specific price for a specific period of time.

Purchase of Other Investment Company Funds

Each Fund may, to the extent permitted under the Investment Company of 1940, as amended (the "1940 Act") and exemptive rules and orders thereunder, invest in shares of other investment companies which invest exclusively in money market instruments or in investment companies with investment policies and objectives which are substantially similar to the Fund's. These investments may be made temporarily, for example, to invest uncommitted cash balances or, in limited circumstances, to assist in meeting shareholder redemptions.

Repurchase Agreements

Each Fund may enter into repurchase agreements with banks and other financial institutions, such as broker-dealers. In substance, a repurchase agreement is a loan for which the Fund receives securities as collateral. Under a repurchase agreement, the Fund purchases securities from a financial institution that agrees to repurchase the securities at the Fund's original purchase price plus interest within a specified time (normally one business day). The Fund will limit repurchase transactions to those member banks of the Federal Reserve System and broker-dealers whose creditworthiness the Adviser considers satisfactory. Should the counterparty to a transaction fail financially, the Fund may encounter delay and incur costs before being able to sell the securities, or may be prevented from realizing on the securities. Further, the amount realized upon the sale of the securities may be less than that necessary to fully compensate the Fund.

Section 4(2) Commercial Paper

Each Fund may also invest in commercial paper issued in reliance on the so-called private placement exemption from registration afforded by Section 4(2) of the Securities Act of 1933 ("Section 4(2) paper"). Section 4(2) paper is restricted as to disposition under the federal securities laws and generally is sold to institutional investors that agree that they are purchasing the paper for investment and not with a view to public distribution. Any resale by the purchaser must be in an exempt transaction. Section 4(2) paper normally is resold to other institutional investors like the Funds through or with the assistance of the issuer or investment dealers that make a market in Section 4(2) paper. Section 4(2) paper will not be subject to a Fund's percentage limitations on illiquid securities when the Adviser (pursuant to guidelines adopted by the Board) determines that a liquid trading market exists.

U.S. Government Securities

9

Each Fund may purchase U.S. government securities. The types of U.S. Government obligations in which each Fund may at times invest include: (1) a variety of U.S. Treasury obligations, which differ only in their interest rates, maturities and times of issuance; and (2) obligations issued or guaranteed by U.S. Government agencies and instrumentalities which are supported by any of the following: (a) the full faith and credit of the U.S. Treasury, (b) the right of the issuer to borrow an amount limited to a specific line of credit from the U.S. Treasury, (c) discretionary authority of the U.S. Government agency or instrumentality or (d) the credit of the instrumentality (examples of agencies and instrumentalities are: Federal Land Banks, Federal Housing Administration, Federal Farm Credit Bank, Farmers Home Administration, Export--Import Bank of the United States, Central Bank for Cooperatives, Federal Intermediate Credit Banks, Federal Home Loan Banks, General Services Administration, Maritime Administration, Tennessee Development Bank, Asian-American Development Bank, Student Loan Marketing Association, International Bank for Reconstruction and Development and Federal National Mortgage Association). No assurance can be given that in the future the U.S. Government will provide financial support to such U.S. Government agencies or instrumentalities described in (2)(b), (2)(c) and (2)(d), other than as set forth above, since it is not obligated to do so by law.

The Money Market Fund may purchase U.S. Government obligations on a forward commitment basis. The Money Market Fund may also purchase Treasury Inflation-Protection Securities, a type of inflation-indexed Treasury security. Treasury Inflation Protected Securities provide for semiannual payments of interest and a payment of principal at maturity which are adjusted for changes in the Consumer Price Index for All Urban Consumers ("CPI-U").

When-Issued Securities

Each Fund may purchase securities on a when-issued basis. Delivery of and payment for these securities may take place as long as a month or more after the date of the purchase commitment. The value of these securities is subject to market fluctuation during this period, and no income accrues to the Fund until settlement takes place. The Fund segregates liquid securities in an amount at least equal to these commitments. For the purpose of determining the adequacy of these securities, the segregated securities will be valued at market. If the market value of such securities declines, additional cash or securities will be segregated on the Fund's records on a daily basis so that the market value of the account will equal the amount of such commitments by the Fund. When entering into a when-issued transaction, the Fund will rely on the other party to consummate the transaction; if the other party fails to do so, the Fund may be disadvantaged. The Money Market Fund will not invest more than 25% of its net assets in when-issued securities.

Securities purchased on a when-issued basis and held by a Fund are subject to changes in market value based upon the public's perception of changes in the level of interest rates. Generally, the value of such securities will fluctuate inversely to changes in interest rates -- i.e., they will appreciate in value when interest rates decline and decrease in value when interest rates rise. Therefore, if in order to achieve higher interest income a Fund remains substantially fully invested at the same time that it has purchased securities on a "when-issued" basis, there will be a greater possibility of fluctuation in the Fund's net asset value.

10

When payment for when-issued securities is due, a Fund will meet its obligations from then-available cash flow, the sale of segregated securities, the sale of other securities or, and although it would not normally expect to do so, from the sale of the when-issued securities themselves (which may have a market value greater or less than the Fund's payment obligation). The sale of securities to meet such obligations carries with it a greater potential for the realization of capital gains, which are subject to federal income taxes.

Reverse Repurchase Agreements

The MSCI(R) EAFE(R) Index Fund, the Aggregate Bond Index Fund and the Money Market Fund may enter into reverse repurchase agreements under the circumstances described in "Investment Restrictions." In substance, a reverse repurchase agreement is a borrowing for which the Fund provides securities as collateral. Under a reverse repurchase agreement, the Fund sells portfolio securities to a financial institution in return for cash in an amount equal to a percentage of the portfolio securities' market value and agrees to repurchase the securities at a future date at a prescribed repurchase price equal to the amount of cash originally received plus interest on such amount. A Fund retains the right to receive interest and principal payments with respect to the securities while they are in the possession of the financial institutions. Cash or liquid high quality debt obligations from a Fund's portfolio equal in value to the repurchase price including any accrued interest will be segregated by the Fund's custodian on the Fund's records while a reverse repurchase agreement is in effect. Reverse repurchase agreements involve the risk that the market value of securities sold by a Fund may decline below the price at which it is obligated to repurchase the securities. Reverse repurchase agreements also involve a risk of default by the counterparty, which may adversely affect a Fund's ability to reacquire the underlying securities.

Total Return Swaps

The MSCI EAFE Index Fund and the Aggregate Bond Index Fund may contract with a counterparty to pay a stream of cash flows and receive the total return of an index or a security for purposes of attempting to obtain a particular desired return at a lower cost to the Fund than if the Fund had invested directly in an instrument that yielded that desired return. A Fund's return on a swap will depend on the ability of its counterparty to perform its obligations under the swap. The Adviser will cause the Fund to enter into swap agreements only with counterparties that would be eligible for consideration as repurchase agreement counterparties under the Fund's repurchase agreement guidelines.

American Depositary Receipts and European Depositary Receipts

The MSCI EAFE Index Fund may purchase American Depositary Receipts ("ADRs") and European Depositary Receipts ("EDRs") of foreign corporations represented in the Fund's Index.

11

Generally, ADRs, in registered form, are designed for use in the U.S. securities markets and EDRs are issued by European financial institutions for trading primarily in European securities markets. ADRs are receipts typically issued by a U.S. bank or trust company evidencing ownership of the underlying securities. Generally, depositary receipts in registered form are designed for use in the U.S. securities market and depositary receipts in bearer form are designed for use in securities markets outside the United States. Depositary receipts may not necessarily be denominated in the same currency as the underlying securities into which they may be converted. Depositary receipts may be issued pursuant to sponsored or unsponsored programs. In sponsored programs, an issuer has made arrangements to have its securities traded in the form of depositary receipts. In unsponsored programs, the issuer may not be directly involved in the creation of the program. Although regulatory requirements with respect to sponsored and unsponsored programs are generally similar, in some cases it may be easier to obtain financial information from an issuer that has participated in the creation of a sponsored program. Accordingly, there may be less information available regarding issuers of securities underlying unsponsored programs and there may not be a correlation between such information and the market value of the depositary receipts. Depositary receipts also involve the risks of other investments in foreign securities.

ADRs represent the right to receive securities of foreign issuers deposited in a domestic bank or a correspondent bank or foreign issuers. However, by investing in ADRs rather than directly in a foreign issuer's stock, the Fund can avoid currency risks during the settlement period for either purchases or sales. In general, there is a large liquid market in the U.S. for many ADRs. The information available for ADRs is subject to the accounting, auditing and financial reporting standards of the domestic market or exchange on which they are traded, which standards are more uniform and more exacting than those to which many foreign issuers are subject. For purposes of the Fund's investment policies, the Fund's investments in ADRs, EDRs, and similar instruments will be deemed to be investments in the equity securities representing securities of foreign issuers to which they relate.

Foreign Currency Exchange Contracts

The MSCI EAFE Index Fund may invest in foreign currency exchange contracts. The Fund has the authority to deal in forward foreign currency exchange contracts (including those involving the U.S. dollar). This is accomplished through individually negotiated contractual agreements to purchase or to sell a specified currency at a specified future date and price set at the time of the contract. The Fund's dealings in forward foreign currency exchange contracts may be with respect to a specific purchase or sale of a security or with respect to its portfolio positions generally.

Asset-Backed Securities

The Aggregate Bond Index Fund and the Money Market Fund may invest in asset-backed securities. Asset-backed securities represent undivided fractional interests in pools of

12

instruments, such as consumer loans, and are similar in structure to mortgage-related securities described below. Payments of principal and interest are passed through to holders of the securities and are typically supported by some form of credit enhancement, such as a letter of credit, surety bond, limited guarantee by another entity or by priority to certain of the borrower's other securities. The degree of credit enhancement varies, generally applying only until exhausted and covering only a fraction of the security's par value. If the credit enhancement of an asset-backed security held by the Fund has been exhausted, and if any required payments of principal and interest are not made with respect to the underlying loans, the Fund may experience loss or delay in receiving payment and a decrease in the value of the security. Use of asset-backed securities will represent less than 5% of the Money Market Fund's total assets by issuer.

Eurodollar Certificates of Deposit ("ECDs"), Eurodollar Time Deposits ("ETDs") and Yankee Certificates of Deposit ("YCDs")

The Aggregate Bond Index Fund may invest in ECDs, ETDs and YCDs. ECDs and ETDs are U.S. dollar denominated certificates of deposit issued by foreign branches of domestic banks and foreign banks. YCDs are U.S. dollar denominated certificates of deposit issued by U.S. branches of foreign banks.

Different risks than those associated with the obligations of domestic banks may exist for ECDs, ETDs and YCDs because the banks issuing these instruments, or their domestic or foreign branches, are not necessarily subject to the same regulatory requirements that apply to domestic banks, such as loan limitations, examinations and reserve, accounting, auditing, recordkeeping and public reporting requirements. Obligations of foreign issuers also involve risks such as future unfavorable political and economic developments, withholding tax, seizures of foreign deposits, currency controls, interest limitations, and other governmental restrictions that might affect repayment of principal or payment of interest, or the ability to honor a credit commitment.

Forward Commitments

The Aggregate Bond Index Fund and the Money Market Fund may contract to purchase securities for a fixed price at a future date beyond customary settlement time. When effecting such transactions, cash or marketable securities held by a Fund of a dollar amount sufficient to make payment for the Fund securities to be purchased will be segregated on a Fund's records at the trade date and maintained until the transaction is settled. The failure of the other party to complete the transaction may cause the Fund to miss an advantageous price or yield. Forward commitments involve risk of loss if the value of the security to be purchased declines prior to settlement date, or if the other party fails to complete the transaction.

Interest Rate Swaps

The Aggregate Bond Index Fund may enter into interest rate swap transactions with respect to any security it is entitled to hold. Interest rate swaps involve the exchange by the Fund with another party of their respective rights to receive interest, e.g., an exchange of floating rate

13

payments for fixed rate payments. The Fund expects to enter into these transactions primarily to preserve a return or spread on a particular investment or portion of its portfolio or to protect against any increase in the price of securities it anticipates purchasing at a later date. The Fund intends to use these transactions as a hedge and not as a speculative investment.

Investment-Grade Bonds

The Aggregate Bond Index Fund may invest in corporate notes and bonds that are rated investment-grade by a Nationally Recognized Statistical Rating Organization ("NRSRO") or, if unrated, are determined by the Adviser to be of comparable quality. Investment-grade securities include securities rated Baa by Moody's or BBB- by S&P (and securities of comparable quality), which securities have speculative characteristics.

Mortgage-Related Securities

The Aggregate Bond Index Fund and the Money Market Fund may invest in mortgage pass-through certificates. Mortgage pass-through certificates are issued by governmental, government-related and private organizations and are backed by pools of mortgage loans. These mortgage loans are made by savings and loan associations, mortgage bankers, commercial banks and other lenders to home buyers throughout the United States. The securities are "pass-through" securities because they provide investors with monthly payments of principal and interest that, in effect, are a "pass-through" of the monthly payments made by the individual borrowers on the underlying mortgage loans, net of any fees paid to the issuer or guarantor of the pass-through certificates. The principal governmental issuer of such securities is the Government National Mortgage Association ("GNMA"), which is a wholly-owned U.S. Government corporation within the Department of Housing and Urban Development. Government-related issuers include the Federal Home Loan Mortgage Corporation ("FHLMC"), is a shareholder-owned government-sponsored enterprise established by Congress, and the Federal National Mortgage Association ("FNMA"), a government sponsored corporation owned entirely by private stockholders. Commercial banks, savings and loan associations, private mortgage insurance companies, mortgage bankers and other secondary market issuers also create pass-through pools of conventional residential mortgage loans. Such issuers may be the originators of the underlying mortgage loans as well as the guarantors of the mortgage-related securities.

1. GNMA Mortgage Pass-Through Certificates ("Ginnie Maes"). Ginnie Maes represent an undivided interest in a pool of mortgage loans that are insured by the Federal Housing Administration or the Farmers Home Administration or guaranteed by the Veterans Administration. Ginnie Maes entitle the holder to receive all payments (including prepayments) of principal and interest owed by the individual mortgagors, net of fees paid to GNMA and to the issuer which assembles the loan pool and passes through the monthly mortgage payments to the certificate holders (typically, a mortgage banking firm), regardless of whether the individual mortgagor actually makes the payment. Because payments are made to certificate holders regardless of whether payments are actually received on the underlying loans, Ginnie Maes are of the "modified pass-

14

through" mortgage certificate type. GNMA is authorized to guarantee the timely payment of principal and interest on the Ginnie Maes as securities backed by an eligible pool of mortgage loans. The GNMA guaranty is backed by the full faith and credit of the United States, and GNMA has unlimited authority to borrow funds from the U.S. Treasury to make payments under the guaranty. The market for Ginnie Maes is highly liquid because of the size of the market and the active participation in the secondary market by securities dealers and a variety of investors.

2. FHLMC Mortgage Participation Certificates ("Freddie Macs"). Freddie Macs represent interests in groups of specified first lien residential conventional mortgage loans underwritten and owned by FHLMC. Freddie Macs entitle the holder to timely payment of interest, which is guaranteed by FHLMC. FHLMC guarantees either ultimate collection or timely payment of all principal payments on the underlying mortgage loans. In cases where FHLMC has not guaranteed timely payment of principal, FHLMC may remit the amount due on account of its guarantee of ultimate payment of principal at any time after default on an underlying loan, but in no event later than one year after it becomes payable. Freddie Macs are not guaranteed by the United States or by any of the Federal Home Loan Banks and do not constitute a debt or obligation of the United States or of any Federal Home Loan Bank. The secondary market for Freddie Macs is highly liquid because of the size of the market and the active participation in the secondary market by FHLMC, securities dealers and a variety of investors.

3. FNMA Guaranteed Mortgage Pass-Through Certificates ("Fannie Maes"). Fannie Maes represent an undivided interest in a pool of conventional mortgage loans secured by first mortgages or deeds of trust, on one-family to four-family residential properties. FNMA is obligated to distribute scheduled monthly installments of principal and interest on the loans in the pool, whether or not received, plus full principal of any foreclosed or otherwise liquidated loans. The obligation of FNMA under its guaranty is solely the obligation of FNMA and is not backed by, nor entitled to, the full faith and credit of the United States.

The market value of mortgage-related securities depends on, among other things, the level of interest rates, the certificates' coupon rates and the payment history of the underlying borrowers.

Although the mortgage loans in a pool underlying a mortgage pass-through certificate will have maturities of up to 30 years, the average life of a mortgage pass-through certificate will be substantially less because the loans will be subject to normal principal amortization and also may be prepaid prior to maturity. Prepayment rates vary widely and may be affected by changes in mortgage interest rates. In periods of falling interest rates, the rate of prepayment on higher interest mortgage rates tends to increase, thereby shortening the actual average life of the mortgage pass-through certificate. Conversely, when interest rates are rising, the rate of prepayment tends to decrease, thereby lengthening the average life of the mortgage pass-through certificate. Accordingly, it is not possible to predict accurately the average life of a particular pool. However, based on current statistics, it is conventional to quote yields on mortgage pass-through certificates based on the assumption that they have effective maturities of 12 years.

15

Reinvestment of prepayments may occur at higher or lower rates than the original yield on the certificates. Due to the prepayment feature and the need to reinvest prepayments of principal at current rates, mortgage pass-through certificates with underlying loans bearing interest rates in excess of the market rate can be less effective than typical noncallable bonds with similar maturities at "locking in" yields during periods of declining interest rates, although they may have comparable risks of declining in value during periods of rising interest rates.

Mortgage-Backed Security Rolls

The Aggregate Bond Index Fund may enter into "forward roll" transactions with respect to mortgage-backed securities issued by GNMA, FNMA or FHLMC. In a forward roll transaction, the Fund will sell a mortgage security to a dealer or other permitted entity and simultaneously agree to repurchase a similar security from the institution at a later date at an agreed upon price. The mortgage securities that are repurchased will bear the same interest rate as those sold, but generally will be collateralized by different pools of mortgages with different prepayment histories than those sold. There are two primary risks associated with the roll market for mortgage-backed securities. First, the value and safety of the roll depends entirely upon the counterparty's ability to redeliver the security at the termination of the roll. Therefore, the counterparty to a roll must meet the same credit criteria as the Fund's repurchase agreement counterparties. Second, the security that is redelivered at the end of the roll period must be substantially the same as the initial security, i.e., it must have the same original stated term to maturity, be priced to result in similar market yields and must be "good delivery." Within these parameters, however, the actual pools that are redelivered could be less desirable than those originally rolled, especially with respect to prepayment characteristics.

Variable and Floating Rate Securities

The Aggregate Bond Index Fund and the Money Market Fund may invest in variable and floating rate securities. A variable rate security provides for the automatic establishment of a new interest rate on set dates. Interest rates on these securities are ordinarily tied to, and are a percentage of, a widely recognized interest rate, such as the yield on 90-day U.S. Treasury bills or the prime rate of a specified bank. These rates may change as often as twice daily. Generally, changes in interest rates will have a smaller effect on the market value of variable and floating rate securities than on the market value of comparable fixed income obligations. Thus, investing in variable and floating rate securities generally allows less opportunity for capital appreciation and depreciation than investing in comparable fixed income securities. Variable rate obligations whose interest is readjusted no less frequently than annually will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate.

Zero Coupon Securities

The Aggregate Bond Index Fund may invest in zero coupon securities. Zero coupon securities are notes, bonds and debentures that: (1) do not pay current interest and are issued at a substantial discount from par value; (2) have been stripped of their unmatured interest coupons

16

and receipts; or (3) pay no interest until a stated date one or more years into the future. These securities also include certificates representing interests in such stripped coupons and receipts. Generally, changes in interest rates will have a greater impact on the market value of a zero coupon security than on the market value of the comparable securities that pay interest periodically during the life of the instrument. In order to satisfy a requirement for qualification as a "regulated investment company" under the Internal Revenue code of 1986, as amended (the "Code"), the Aggregate Bond Index Fund must distribute at least 90% of its net investment income, including the original issue discount accrued on zero coupon bonds. Because the Aggregate Bond Index Fund will not receive cash payments on a current basis from the issuer in respect of accrued original discount, the Fund may have to distribute cash obtained from other sources in order to satisfy the 90% distribution requirement. Such cash might be obtained from selling other portfolio holdings of the Aggregate Bond Index Fund. In some circumstances such sales might be necessary in order to satisfy cash distribution requirements even though investment considerations might otherwise make it undesirable for the Aggregate Bond Index Fund to sell such securities at such time.

The Money Market Fund may invest no more than 25% of its respective total assets in stripped securities that have been stripped by their holder, typically a custodian bank or investment brokerage firm. A number of securities firms and banks have stripped the interest coupons and resold them in custodian receipt programs with different names such as Treasury Income Growth Receipts ("TIGRS") and Certificates of Accrual on Treasuries ("CATS"). Privately-issued stripped securities such as TIGRS and CATS are not themselves guaranteed by the U.S. Government, but the future payment of principal or interest on U.S. Treasury obligations which they represent is so guaranteed.

Investment Restrictions

The Portfolios in which State Street Equity 500 Index Fund, State Street Equity 400 Index Fund, State Street Equity 2000 Index Fund, State Street MSCI EAFE Index Fund and State Street Aggregate Bond Index Fund invest each have substantially the same investment restrictions as their corresponding Fund. In reviewing the description of a Fund's investment restrictions below, you should assume that the investment restrictions of the corresponding Portfolio are the same in all material respects as those of the Fund.

The Trust has adopted the following restrictions applicable to all of the Funds, which may not be changed without the affirmative vote of a "majority of the outstanding voting securities" of a Fund, which is defined in the 1940 Act, to mean the affirmative vote of the lesser of (1) more than 50% of the outstanding shares of the Fund and (2) 67% or more of the shares present at a meeting if more than 50% of the outstanding shares are present at the meeting in person or by proxy.

Each Index Fund may not:

17

(1) Borrow more than 33 1/3% of the value of its total assets less all liabilities and indebtedness (other than such borrowings).

(2) Underwrite securities issued by other persons except to the extent that, in connection with the disposition of its portfolio investments, it may be deemed to be an underwriter under certain federal securities laws.

(3) Purchase or sell real estate, although it may purchase securities of issuers which deal in real estate, securities which are secured by interests in real estate, and securities which represent interests in real estate, and it may acquire and dispose of real estate or interests in real estate acquired through the exercise of its rights as a holder of debt obligations secured by real estate or interests therein.

(4) Purchase or sell commodities or commodity contracts, except that it may purchase and sell financial futures contracts and options and may enter into foreign exchange contracts and other financial transactions not involving the direct purchase or sale of physical commodities.

(5) Make loans, except by purchase of debt obligations in which the Fund may invest consistent with its investment policies, by entering into repurchase agreements, or by lending its portfolio securities.

(6) With respect to 75% of its total assets, invest in the securities of any issuer if, immediately after such investment, more than 5% of the total assets of the Fund (taken at current value) would be invested in the securities of such issuer; provided that this limitation does not apply to obligations issued or guaranteed as to interest or principal by the U.S. government or its agencies or instrumentalities, or to securities issued by other investment companies.

(7) With respect to 75% of its total assets, acquire more than 10% of the outstanding voting securities of any issuer, provided that such limitation does not apply to securities issued by other investment companies.

(8) Purchase securities (other than securities of the U.S. government, its agencies or instrumentalities), if, as a result of such purchase, more than 25% of the Fund's total assets would be invested in any one industry.

(9) Issue any class of securities which is senior to the Fund's shares, to the extent prohibited by the Investment Company Act of 1940, as amended.

In addition, it is contrary to each Index Fund's present policy, which may be changed without shareholder approval, to invest in (a) securities which are not readily marketable, (b) securities restricted as to resale (excluding securities determined by the Trustees of the Trust (or the person designated by the Trustees of the Trust to make such determinations) to be readily marketable), and (c) repurchase agreements maturing in more than seven days, if, as a result,

18

more than 15% of the Fund's net assets (taken at current value) would be invested in securities described in (a), (b) and (c) above.

The Trust has also adopted the following fundamental investment policies, which, with respect to the Money Market Fund, may not be changed without the approval of a majority of the shareholders of the Fund. The Money Market Fund will not:

(1) Invest 25% or more of the value of its total assets in securities of companies primarily engaged in any one industry (other than the U.S. Government, its agencies and instrumentalities). Concentration may occur as a result of changes in the market value of portfolio securities, but may not result from investment. Foreign and domestic branches of U.S. and foreign banks are not considered a single industry for purposes of this restriction.

(2) Borrow money, except as a temporary measure for extraordinary or emergency purposes or to facilitate redemptions (not for leveraging or investment), provided that borrowings do not exceed an amount equal to 33-1/3% of the current value of the Fund's assets taken at market value, less liabilities other than borrowings. If at any time the Fund's borrowings exceed this limitation due to a decline in net assets, such borrowings will within three days be reduced to the extent necessary to comply with this limitation. The Fund will not purchase investments once borrowed funds (including reverse repurchase agreements) exceed 5% of its total assets.

(3) Pledge, mortgage or hypothecate its assets. However, the Fund may pledge securities having a market value (on a daily marked-to-market basis) at the time of the pledge not exceeding 33-1/3% of the value of the Fund's total assets to secure borrowings permitted by paragraph (2) above.

(4) With respect to 75% of its total assets, invest in securities of any one issuer (other than securities issued by the U.S. Government, its agencies, and instrumentalities), if immediately after and as a result of such investment the current market value of the Fund's holdings in the securities of such issuer exceeds 5% of the value of the Fund's assets and to not more than 10% of the outstanding voting securities of such issuer.

(5) Make loans to any person or firm; provided, however, that the making of a loan shall not include: (i) the acquisition for investment of bonds, debentures, notes or other evidences of indebtedness of any corporation or government which are publicly distributed or of a type customarily purchased by institutional investors, or (ii) the entry into "repurchase agreements." The Fund may lend its portfolio securities to broker-dealers or other institutional investors if the aggregate value of all securities loaned does not exceed 33-1/3% of the value of the Fund's total assets.

19

(6) Invest more than 10% of its net assets in the aggregate, on an ongoing basis, in illiquid securities or securities that are not readily marketable, including repurchase agreements and time deposits of more than seven days' duration.

(7) Purchase or sell puts, calls or invest in straddles, spreads or any combination thereof.

(8) Make short sales of securities or purchase any securities on margin, except for such short-term credits as are necessary for the clearance of transactions.

(9) Purchase or sell real estate or real estate mortgage loans; provided, however, that the Fund may invest in securities secured by real estate or interests therein or issued by companies which invest in real estate or interests therein.

(10) Purchase interests in oil, gas or other mineral exploration or development programs.

(11) Purchase or sell commodities or commodity futures contracts.

(12) Engage in the business of underwriting securities issued by others, except that the Fund will not be deemed to be an underwriter or to be underwriting on account of the purchase of securities subject to legal or contractual restrictions on disposition.

(13) Issue senior securities, except as permitted by its investment objective, policies and restrictions, and except as permitted by the 1940 Act.

(14) Make investments for the purpose of gaining control of an issuer's management.

(15) Purchase the securities of any issuer if the Fund's officers, Trustees, Adviser or any of their affiliates beneficially own more than one-half of 1% of the securities of such issuer or together own beneficially more than 5% of the securities of such issuer.

(16) Invest in securities of any issuer which, together with its predecessor, has been in operation for less than three years if, as a result, more than 5% of the Fund's total assets would be invested in such securities, except that the Fund may invest in securities of a particular issuer to the extent its respective underlying index invests in that issuer.

(17) Purchase from or sell portfolio securities to its officers or Trustees or other "interested persons" (as defined in the 1940 Act) of the Fund, including the Adviser and affiliates, except as permitted by the 1940 Act and exemptive rules or orders thereunder.

20

The concentration policy of the Money Market Fund (as set forth in Investment Restriction No. 1, above) permits the Money Market Fund to invest, without limit, in bankers' acceptances, certificates of deposit and similar instruments issued by: (i) U.S. banks, (ii) U.S. branches of foreign banks (in circumstances in which the U.S. branches of foreign banks are subject to the same regulation as U.S. banks), (iii) foreign branches of U.S. banks (in circumstances in which the Money Market Fund will have recourse to the U.S. bank for the obligations of the foreign branch), and (iv) foreign branches of foreign banks to the extent that the Adviser determines that the foreign branches of foreign banks are subject to the same or substantially similar regulations as U.S. banks. The Money Market Fund may concentrate in such instruments when, in the opinion of the Adviser, the yield, marketability and availability of investments meeting the Money Market Fund's quality standards in the banking industry justify any additional risks associated with the concentration of the Fund's assets in such industry. To the extent these restrictions reflect matters of operating policy which may be changed without shareholder vote, these restrictions may be amended upon approval by the Board of Trustees and notice to shareholders. If a percentage restriction is adhered to at the time of investment, a subsequent increase or decrease in a percentage resulting from a change in the values of assets will not constitute a violation of that restriction, except as otherwise noted.

All percentage limitations on investments will apply at the time of the making of an investment and shall not be considered violated unless an excess or deficiency occurs or exists immediately after and as a result of such investment. Except for the investment restrictions listed above as fundamental or to the extent designated as such in the Prospectus with respect to a Fund, the other investment policies described in this Statement or in the Prospectus are not fundamental and may be changed by approval of the Trustees.

MANAGEMENT OF THE TRUST

The Trustees are responsible for generally overseeing the Trust's business. The following table provides biographical information with respect to each Trustee and officer of the Trust. As of April 30, 2002, none of the Trustees was considered an "interested person" of the Trust, as defined in the 1940 Act.

                                                                                          NUMBER OF FUNDS   OTHER
                             POSITION(S)    TERM OF OFFICE                                IN FUND COMPLEX   DIRECTORSHIPS
                             HELD WITH      AND LENGTH OF                                 OVERSEEN BY       HELD BY TRUSTEE
                             FUND           TIME SERVED                                   TRUSTEE
NAME, ADDRESS, AND AGE                                          PRINCIPAL OCCUPATION
                                                                DURING PAST FIVE YEARS
NON-INTERESTED TRUSTEES

Michael F. Holland
Age: 57                      Trustee and    Term: Indefinite    Holland & Company         14                Director of
375 Park Avenue              Chairman of                        L.L.C., Chairman, 1995                      the Holland
New York, NY 10152           the Board      Elected: 2/00       to present.                                 Series Fund,
                                                                                                            Inc. and the
                                                                                                            China Fund,
                                                                                                            Inc.

William L. Boyan
Age: 65                      Trustee        Term: Indefinite    Trustee of Old Mutual     14                Trustee of Old

21

                                                                                          NUMBER OF FUNDS   OTHER
                             POSITION(S)    TERM OF OFFICE                                IN FUND COMPLEX   DIRECTORSHIPS
                             HELD WITH      AND LENGTH OF                                 OVERSEEN BY       HELD BY TRUSTEE
                             FUND           TIME SERVED                                   TRUSTEE
NAME, ADDRESS, AND AGE                                          PRINCIPAL OCCUPATION
                                                                DURING PAST FIVE YEARS
86 A Beacon Street                                              South Africa Equity                         Mutual South
Boston, MA 02108                            Elected: 2/00       Trust since 1983;                           Africa Equity
                                                                Chairman of the Board                       Trust
                                                                of Trustees of
                                                                Children's Hospital and
                                                                Children's Medical
                                                                Center since 1984;
                                                                Director of John
                                                                Hancock Mutual Life
                                                                Insurance Company, 1983
                                                                to 1998; and President
                                                                and Chief Operations
                                                                Officer of John Hancock
                                                                Mutual Life Insurance
                                                                Company, 1992 to 1998.
                                                                Mr. Boyan retired in
                                                                1999.

Rina K. Spence
Age: 53                      Trustee        Term: Indefinite    President of SpenceCare     14              Director of
7 Acacia Street                                                 International LLC since                     Berkshire Life
Cambridge, MA 02138                         Elected: 2/00       1998; Chief Executive                       Insurance
                                                                Officer of Consensus                        Company of
                                                                Pharmaceutical, Inc.,                       America
                                                                1998 to 1999; and
                                                                Founder, President and
                                                                Chief Executive Officer
                                                                of Spence Center for
                                                                Women's Health, 1994 to
                                                                1998.

Douglas T. Williams
Age: 62                      Trustee        Term: Indefinite    Executive Vice              14              None
P.O. Box 5049                                                   President of Chase
Boston, MA                                  Elected: 2/00       Manhattan Bank, 1987 to
02206                                                           1999.  Mr. Williams
                                                                retired in 1999.


OFFICERS:

Kathleen C. Cuocolo          President      Term: Indefinite    Executive Vice              --              --
Age: 49                                                         President of State
Two Avenue de Lafayette,                    Elected: 5/00       Street Bank and Trust
Boston, MA 02111                                                Company since 2000; and
                                                                Senior Vice President of
                                                                State Street Bank and
                                                                Trust Company, 1982 to
                                                                2000.

22

                                                                                          NUMBER OF FUNDS   OTHER
                             POSITION(S)    TERM OF OFFICE                                IN FUND COMPLEX   DIRECTORSHIPS
                             HELD WITH      AND LENGTH OF                                 OVERSEEN BY       HELD BY TRUSTEE
                             FUND           TIME SERVED                                   TRUSTEE
NAME, ADDRESS, AND AGE                                          PRINCIPAL OCCUPATION
                                                                DURING PAST FIVE YEARS
Janine L. Cohen                                                                           ------            ------
Age: 48                      Treasurer      Term: Indefinite    Senior Vice President
Two Avenue de Lafayette,                                        of State Street Bank
Boston, MA 02111                            Elected: 5/00       and Trust Company since
                                                                2001; and Vice
                                                                President of State
                                                                Street Bank and Trust
                                                                Company, 1992 to 2000.

Julie A. Tedesco                                                                          ------            ------
Age: 44                      Secretary      Term: Indefinite    Vice President and
One Federal Street                                              Counsel of State Street
Boston, MA 02110                            Elected: 5/00       Bank and Trust Company
                                                                since 2000; and Counsel
                                                                of First Data Investor
                                                                Services Group, Inc.,
                                                                1994 to 2000.

The By-Laws of the Trust provide that the Trust shall indemnify each person who is or was a Trustee of the Trust against all expenses, judgments, fines, settlements and other amounts actually and reasonable incurred in connection with any proceedings if the person in good faith and reasonably believes that his or her conduct was in the Trust's best interest. The Trust, at its expense, provides liability insurance for the benefit of its Trustees and officers.

Standing Committees

The Board of Trustees has established various committees to facilitate the timely and efficient consideration of all matters of importance to non-interested Trustees, the Trust, and the Trust's shareholders and to facilitate compliance with legal and regulatory requirements. Currently, the Board has created an Audit Committee and Nominating Committee.

The Audit Committee is composed of all the non-interested Trustees. The Audit Committee meets twice a year, or more often as required, in conjunction with meetings of the Board of Trustees. The Audit Committee oversees and monitors the Trust's internal accounting and control structure, its auditing function and its financial reporting process. The Audit Committee recommends to the full Board of Trustees the appointment of auditors for the Trust. The Audit Committee also reviews audit plans, fees and other material arrangements in respect of the engagement of auditors, including non-audit services performed. It reviews the qualifications of the auditor's key personnel involved in the foregoing activities and monitors the auditor's independence. During the fiscal year ended December 31, 2001, the Audit Committee held two meetings.

The Nominating Committee is composed of all of the non-interested Trustees. The Nominating Committee is responsible for nominating for election as Trustees candidates who

23

may be either "interested persons" or non-interested persons of the Trust. The Nominating Committee meets as is required. During the fiscal year ended December 31, 2001, the Nominating Committee did not meet.

Trustee Ownership of Securities of the Trust, Adviser and Distributor

As of December 31, 2001 none of the non-interested Trustees had any ownership of securities of the Adviser or ALPS Distributors, Inc. ("ALPS"), the Trust's distributor, or any person directly or indirectly controlling, controlled by or under common control with the Adviser or ALPS.

The following table sets forth information describing the dollar range of equity securities beneficially owned by each Trustee in the Trust as of December 31, 2001.

                                                                        Aggregate Dollar Range of Equity Securities
                                                                        in All Registered Investment Companies
                                Dollar Range of Equity Securities in    Overseen by Trustee in Family of Investment
Name of Trustee                 the Trust                               Companies
     William L. Boyan                    None                            None
     Michael F. Holland                  None                            None
     Rina K. Spence                      None                            None
     Douglas T. Williams                 None                            None

Trustee Compensation

The following table sets forth the total remuneration of Trustees and officers of the Trust for the fiscal year ended December 31, 2001.

                                                   Pension or
                                                   Retirement         Estimated         Total Compensation
                                                   Benefits           Annual Benefits   from Trust & Fund
                               Aggregate           Accrued as Part    Upon Retirement   Complex Paid to
                               Compensation from   of Trust Expenses                    Trustees
Name and Position              Trust
William L. Boyan, Trustee      $0                  $0                 $0                $30,000
Michael F. Holland, Trustee    $0                  $0                 $0                $30,000
Rina K. Spence, Trustee        $0                  $0                 $0                $30,000
Douglas T. Williams, Trustee   $0                  $0                 $0                $30,000

24

The Trust, the Adviser and ALPS have adopted codes of ethics (the "Codes of Ethics") under Rule 17j-1 of the 1940 Act. The Codes of Ethics permit personnel, subject to the Codes of Ethics and their provisions, to invest in securities, including securities that may be purchased or held by the Trust, Adviser, Transfer Agent, Custodian and ALPS

CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES

As of April 1, 2002, the Trustees and officers of the Trust owned in the aggregate less than 1% of the shares of the Funds of the Trust (all series taken together).

Persons or organizations owning 25% or more of the outstanding shares of a Fund may be presumed to "control" (as that term is defined in the 1940 Act) a Fund. As a result, these persons or organizations could have the ability to approve or reject those matters submitted to the shareholders of such Fund for their approval.

As of April 1, 2002, the names and Interests ownership of the entities which held 5 percent or more of the outstanding Interests of any of the Trust's Funds were as follows:

                                                         Percentage of Interests
State Street Equity 500 Index Fund
         Class A Shares:

                  American United Life                             100%

INVESTMENT ADVISORY AND OTHER SERVICES

Under the terms of the Investment Advisory Agreement with the Adviser (the "Advisory Agreement"), the Adviser is required to manage each Fund subject to the supervision and direction of the Board of Trustees of the Trust.

The Advisory Agreement will continue from year to year provided that a majority of the Trustees who are not interested persons of the Trust and either a majority of all Trustees or a majority of the shareholders of the Trust approve its continuance. The Advisory Agreement may be terminated by the Adviser or the Trust without penalty upon sixty days' notice and will terminate automatically upon its assignment. In determining to continue the Advisory Agreement, the Board considered all information reasonably necessary to evaluate the terms of the Advisory Agreement, including (i) the nature and quality of services rendered; (ii) the expenses and performance of the Funds; and (iii) the profitability of the Adviser in providing services to the Trust. In approving the continuance of the Advisory Agreement, the Board, after reviewing various materials and reports, concluded that (i) the Adviser and its personnel were sufficiently experienced and qualified to provide investment advisory services for the Trust's Funds; (ii) the Trust's expense ratios are low compared to other funds with similar investment objectives; (iii) the Trust's performance has been satisfactory when compared to its relevant

25

benchmarks and other funds with similar investment objectives; and (iv) the profitability of the Adviser and its affiliates for providing services to the Trust is within an acceptable range.

The Adviser and its affiliates may have deposit, loan and other commercial banking relationships with the issuers of obligations that may be purchased on behalf of the Funds, including outstanding loans to such issuers that could be repaid in whole or in part with the proceeds of securities so purchased. Such affiliates deal, trade and invest for their own accounts in such obligations and are among the leading dealers of various types of such obligations. The Adviser has informed the Funds that, in making its investment decisions, it will not obtain or use material inside information in its possession or in the possession of any of its affiliates. In making investment recommendations for a Fund, the Adviser will not inquire or take into consideration whether an issuer of securities proposed for purchase or sale by the Fund is a customer of the Adviser, its parent or its subsidiaries or affiliates and, in dealing with its customers, the Adviser, its parent, subsidiaries and affiliates will not inquire or take into consideration whether securities of such customers were held by any Fund managed by the Adviser or any such affiliate.

Investment Advisory Agreements

Each Fund current invests all of its assets in a related Portfolio that has the same investment objectives and substantially the same investment policies as the relevant Fund. As long as a Fund remains completely invested in a Portfolio (or any other investment company), the Adviser is not entitled to receive any investment advisory fee with respect to the Fund. A Fund may withdraw its investment from the related Portfolio at any time if the Trust's Board of Trustees determines that it is in the best interests of the Fund and its shareholders to do so. The Trust has retained the Adviser as investment adviser to manage a Fund's assets in the event that the Fund withdraws its investment from its related Portfolio.

The Adviser is also the investment adviser to each of the related Portfolios pursuant to an investment advisory agreement (the "Portfolio Advisory Agreement") between the Adviser and State Street Master Funds, on behalf of the Portfolios. The Adviser receives an investment advisory fee with respect to each related Portfolio. The Portfolio Advisory Agreement is the same in all material respects as the Investment Advisory Agreement between the Trust on behalf of the Funds and the Adviser. Each Fund that invests in a related Portfolio bears a proportionate part of the management fees paid by the Portfolio (based on the percentage of the Portfolio's assets attributable to the Fund).

Administrator, Custodian and Transfer Agent

Under the Administrative Services Agreement (the "Administration Agreement"), State Street Bank and Trust Company ("State Street") is obligated on a continuous basis to provide such administrative services as the Board of Trustees of the Trust reasonably deems necessary for the proper administration of the Trust and the Fund. State Street will generally assist in all aspects of the Trust's and the Funds' operations; supply and maintain office facilities (which may be in State Street's own offices); provide statistical and research data, data processing

26

services, clerical, accounting, bookkeeping and record keeping services (including without limitation the maintenance of such books and records as are required under the 1940 Act and the rules thereunder, except as maintained by other agents), internal auditing, executive and administrative services, and stationery and office supplies; prepare reports to shareholders or investors; prepare and file tax returns; supply financial information (the "SEC") and supporting data for reports to and filings with the Securities and Exchange Commission and various state Blue Sky authorities; supply supporting documentation for meetings of the Board of Trustees; provide monitoring reports and assistance regarding compliance with Declarations of Trust, by-laws, investment objectives and policies and with Federal and state securities laws; arrange for appropriate insurance coverage; calculate NAVs, net income and realized capital gains or losses; and negotiate arrangements with, and supervise and coordinate the activities of, agents and others to supply services. Pursuant to the Administration Agreement, the Trust has agreed to indemnify the Administrator for certain liabilities, including certain liabilities arising under federal securities laws, unless such loss or liability results from the Administrator's gross negligence or willful misconduct in the performance of its duties. State Street serves as Custodian for the Funds pursuant to the Custody Agreement. As Custodian, it holds the Funds' assets. State Street also serves as Transfer Agent of the Funds pursuant to the Transfer Agency and Service Agreement.

Fees

As consideration for the State Street's services as administrator, transfer agent and custodian to the Funds, State Street shall be entitled to receive from each Fund an annual fee, accrued daily at the rate of 1/365th of the applicable fee rate and payable monthly on the first business day of each month, of the following annual percentages of each Fund's average daily net assets during the month:

                                                     Annual percentage of
Fund                                                 average daily net assets
-----------------------------------------------------------------------------
Equity 500 Index Fund
-  Class A Shares                                    .05%
Equity 500 Index Fund
-  Class B Shares                                    .05%
Equity 400 Index Fund                                .10%
Equity 2000 Index Fund                               .10%
MSCI EAFE Index Fund                                 .10%
Aggregate Bond Index Fund                            .10%
Money Market Fund                                    .05%

The administration, custodian and transfer agency fees accrued for the last fiscal year is set forth in the table below.

Fund                                        Fiscal year ended December 31, 2001
----                                        -----------------------------------
Equity 500 Index Fund                       $59,290

27

Rule 12b-1 Plan

The Trust has adopted a distribution plan pursuant to Rule 12b-1 (the "Rule 12b-1 Plan") under which the Funds may compensate their distributor (or others) for services in connection with the distribution of the Funds' shares and for services provided to Fund shareholders. The Rule 12b-1 Plan calls for payments at an annual rate (based on average net assets) as follows:

State Street Equity 500 Index Fund - Class A:        0.15%
State Street Equity 500 Index Fund - Class B:        0.25%
State Street Equity 400 Index Fund:                  0.25%
State Street Equity 2000 Index Fund:                 0.25%
State Street MSCI EAFE Index Fund:                   0.25%
State Street Aggregate Bond Index Fund:              0.25%

Shareholder servicing fees paid to the Distributor pursuant to Class A Service Plans for the last fiscal year are reflected in the chart below.

FUND                                         Fiscal Year Ended December 31, 2001
Equity 500 Index Fund

         Class A                             $177,863

Counsel and Independent Auditors

Ropes & Gray, One International Place, Boston, Massachusetts 02110, serves as counsel to the Trust. Ernst & Young LLP are the independent auditors for the Funds, providing audit services, tax return preparation, and assistance and consultation with respect to the preparation of filings with the Securities and Exchange Commission. The principal business address of Ernst & Young LLP is 200 Clarendon St., Boston, Massachusetts 02116.

BROKERAGE ALLOCATION AND OTHER PRACTICES

The policy of the Trust regarding purchases and sales of securities for the Funds is that primary consideration will be given to obtaining the most favorable prices and efficient executions of transactions. Consistent with this policy, when securities transactions are effected on a stock exchange, the Trust's policy is to pay commissions that are considered fair and reasonable without necessarily determining that the lowest possible commissions are paid in all circumstances. The Trust believes that a requirement always to seek the lowest possible commission cost could impede effective portfolio management and preclude the Fund and the Adviser from obtaining a high quality of brokerage and research services.

28

In seeking to determine the reasonableness of brokerage commissions paid in any transaction, the Adviser relies upon its experience and knowledge regarding commissions generally charged by various brokers and on its judgment in evaluating the brokerage and research services received from the broker effecting the transaction. Such determinations are necessarily subjective and imprecise, as in most cases an exact dollar value for those services is not ascertainable. In seeking to implement the Trust's policies, the Adviser effects transactions with those brokers and dealers who the Adviser believes provides the most favorable prices and are capable of providing efficient executions. If the Adviser believes such price and execution are obtainable for more than one broker or dealer, it may give consideration to placing portfolio transactions with those brokers and dealers who also furnish research and other services to the Funds or the Adviser. Such services may include, but are not limited to, information as to the availability of securities for purchase or sale and statistical information pertaining to corporate actions affecting stocks, including but not limited to, stocks within the index whose performance the Fund in question seeks to replicate. The fee paid by the Funds is not reduced because the Adviser and its affiliates receive these services even though the Adviser might otherwise have been required to purchase some of these services for cash. The brokerage commissions paid by the Fund for the last fiscal year is as follows:

Fund                                         Fiscal Year Ended December 31 2001
Equity 500 Index Fund                        $0

The Adviser assumes general supervision over placing orders on behalf of the Trust for the purchase or sale of portfolio securities. If purchases or sales of portfolio securities of the Trust and one or more other investment companies or clients supervised by the Adviser are considered at or about the same time, transactions in such securities are allocated among the several investment companies and clients in a manner deemed equitable to all by the Adviser. In some cases, this procedure could have a detrimental effect on the price or volume of the security so far as the Trust is concerned. However, in other cases, it is possible that the ability to participate in volume transactions and to negotiate lower brokerage commission will be beneficial to the Trust. The primary consideration is prompt execution of orders at the most favorable net price.

CAPITAL STOCK AND OTHER SECURITIES

Under the Declaration of Trust, the Trustees are authorized to issue an unlimited number of shares of each Fund. Upon liquidation or dissolution of a Fund, investors are entitled to share pro rata in the Fund's net assets available for distribution to its investors. Investments in a Fund have no preference, preemptive, conversion or similar rights and are fully paid and nonassessable, except as set forth below. Investments in a Fund may not be transferred.

Each investor is entitled to a vote in proportion to the number of Fund shares it owns. Shares do not have cumulative voting rights, and investors holding more than 50% of the aggregate outstanding shares in the Trust may elect all of the Trustees if they choose to do so.

29

The Trust is not required and has no current intention to hold annual meetings of investors when in the judgment of the Trustees it is necessary or desirable to submit matters for an investor vote.

Under Massachusetts law, shareholders in a Massachusetts business trust could, under certain circumstances, be held personally liable for the obligations of the trust. However, the Declaration of Trust disclaims shareholder liability for acts or obligations of the Trust and provides for indemnification out of the Trust's property for any claim or liability to which the shareholder may become subject by reason of being or having been an shareholder and for reimbursement of the shareholder for all legal and other expenses reasonably incurred by the shareholder in connection with any such claim or liability. Thus the risk of a shareholder incurring financial loss on account of shareholder liability is limited to circumstances in which the Trust would be unable to meet its obligations.

PURCHASE, REDEMPTION AND PRICING OF SHARES

Shares of the Index Funds are offered continuously at a price equal to the net asset value attributable to each share. Each Index Fund determines the net asset value per share on each day on which the New York Stock Exchange (the "NYSE") is open for trading ("Business Day"). This determination is made each Business Day at the close of regular trading on the NYSE (the "Valuation Time") by dividing the value of the Index Fund's net assets (i.e., the value of its securities and other assets less its liabilities, including expenses payable or accrued) by the number of shares outstanding at the time the determination is made. The Money Market Fund determines the price per share each Business Day at 3 p.m. Eastern time or the Valuation Time, whichever is earlier.

The NYSE is open for trading every weekday except for: (a) the following holidays: New Year's Day, Martin Luther King, Jr.'s Birthday, Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas; and (b) the preceding Friday or the subsequent Monday when one of the calendar-determined holidays falls on a Saturday or Sunday, respectively. Purchases and withdrawals will be effected at the time of determination of net asset value next following the receipt of any purchase or withdrawal order which is determined to be in good order.

It is the Money Market Fund's policy to use its best efforts to maintain a constant price per share of $1.00, although there can be no assurance that the $1.00 net asset value per share will be maintained. In accordance with this effort and pursuant to Rule 2a-7 under the 1940 Act, the Money Market Fund uses the amortized cost valuation method to value its portfolio instruments. This method involves valuing an instrument at its cost and thereafter assuming a constant amortization to maturity of any discount or premium, even though the portfolio security may increase or decrease in market value generally in response to changes in interest rates. While this method provides certainty in valuation, it may result in periods during which value, as determined by amortized cost, is higher or lower than the price the Money Market Fund would receive if it sold the instrument.

30

For example, in periods of declining interest rates, the daily yield on the Money Market Fund's shares computed by dividing the annualized daily income on the Fund's portfolio by the net asset value based upon the amortized cost valuation technique may tend to be higher than a similar computation made by using a method of valuation based upon market prices and estimates. In periods of rising interest rates, the daily yield on Money Market Fund shares computed the same way may tend to be lower than a similar computation made by using a method of calculation based upon market prices and estimates.

The Trustees have established procedures reasonably designed to stabilize the Money Market Fund's price per share at $1.00. These procedures include: (1) the determination of the deviation from $1.00, if any, of the Money Market Fund's net asset value using market values; (2) periodic review by the Trustees of the amount of and the methods used to calculate the deviation; and
(3) maintenance of records of such determination. The Trustees will promptly consider what action, if any, should be taken if such deviation exceeds 1/2 of one percent.

Equity and debt securities (other than short-term debt obligations maturing in 60 days or less), including listed securities and securities for which price quotations are available, will normally be valued on the basis of market value. This generally means that equity securities and fixed income securities listed and traded principally on any national securities exchange, including securities traded on the NASDAQ National Market System, are valued on the basis of the last sale price or, lacking any sales, at the closing bid price, on the primary exchange on which the security is traded. U.S. equity and fixed-income securities traded principally over-the-counter and options are valued on the basis of the last reported bid price prior to the Valuation Time. Futures contracts are valued on the basis of the last reported sale price prior to the Valuation Time. Short-term debt obligations and money market securities maturing in 60 days or less are valued at amortized cost, which approximates market. Other assets are valued at fair value using methods determined in good faith by the Board of Trustees.

TAXATION OF THE FUND

Qualification as a Regulated Investment Company

Each Fund intends to qualify each year as a regulated investment company under Subchapter M of the Code. In order to qualify for the favorable tax treatment accorded regulated investment companies, each Fund must, among other things, (i) derive at least 90% of its gross income from dividends, interest, payments with respect to certain securities loans, gains from the sale of securities or foreign currencies, or other income (including, but not limited to, gains from options, futures or forward contracts) derived with respect to its business of investing in such stock, securities or currencies; (ii) distribute with respect to each taxable year at least 90% of the sum of its taxable net investment income, its tax-exempt income and the excess, if any, of net short-term capital gains over net long-term capital losses for each year; and (iii) diversify its holdings so that at the end of each fiscal quarter (a) at least 50% of the value of its total assets are invested in cash, U.S. government securities, securities of other regulated investment companies, and other securities of issuers which represent, with respect to each issuer, no more than 5% of the value of the Fund's total assets and 10% of the outstanding voting securities of such issuer,

31

and (b) not more than 25% of its assets are invested in the securities (other than those of the U.S. government or other regulated investment companies) of any one issuer or of two or more issuers which the Fund controls and which are engaged in the same, similar or related trades and businesses. To the extent it qualifies for treatment as a regulated investment company, the Fund will not be subject to federal income tax on income paid to its shareholders in the form of dividends or capital gain distributions.

An excise tax at the rate of 4% will be imposed on the excess, if any, of each Fund's "required distribution" over its actual distributions in any calendar year. Generally, the "required distribution" is 98% of the Fund's ordinary income for the calendar year plus 98% of its capital gain net income recognized during the one-year period ending October 31 (or December 31, if the Fund so elects) plus undistributed amounts from prior years. Each Fund intends to make distributions sufficient to avoid imposition of the excise tax. Distributions declared by a Fund during October, November and December to shareholders of record on a date in any such month and paid by the Fund during the following January will be treated for federal tax purposes as paid by the Fund and received by shareholders on December 31 of the year in which declared.

Taxation of Distributions Received by Shareholders

Shareholders of each Fund will be subject to federal income taxes on distributions made by the Fund whether received in cash or additional shares of the Fund. Distributions by each Fund of net income and short-term capital gains, if any, will be taxable to shareholders as ordinary income. Distributions designated by a Fund as deriving from net gains on securities held for more than one year will be taxable to shareholders as long-term capital gain (generally taxed at 20% rate for noncorporate shareholders), without regard to how long a shareholder has held shares of the Fund.

Dividends and distributions on a Fund's shares are generally subject to federal income tax as described herein. Even though such dividends and distributions may economically represent a return of a particular shareholder's investment. Such distributions are likely to occur in respect of shares purchased at a time when a Fund's net asset value reflects gains that are either unrealized, or realized but not distributed. Such realized gains may be required to be distributed even when a Fund's net asset value also reflects unrealized losses.

Taxation of Certain Financial Instruments

Each Index Fund may enter into futures contracts, options on futures contracts and options on securities indices. Such contracts held by the Index Fund at the close of its taxable year will generally be treated for federal income tax purposes as sold for their fair market value on the last business day of such year, a process known as "marking-to-market." Forty percent of any gain or loss resulting from this constructive sale will be treated as short-term capital gain or loss and 60 percent of such gain or loss will be treated as long-term capital gain or loss without regard to the period the Index Fund actually held the instruments. The amount of any capital gain or loss actually realized by the Index Fund in a subsequent sale or other disposition of the

32

instruments is adjusted to reflect any capital gain or loss taken into account in a prior year as a result of the constructive sale of the instruments. The hedging transactions undertaken by the Index Fund may result in "straddles" for federal income tax purposes. The straddle rules may affect the character of gains or losses realized by an Index Fund. In addition, losses realized by the Index Fund on positions that are part of a straddle may be deferred under the straddle rules, rather than being taken into account in calculating the taxable income for the taxable year in which the losses are realized.

An Index Fund may make one or more of the elections available under the Code that are applicable to straddles. If an Index Fund makes any of the elections, the amount, character and timing of the recognition of gains and losses from the affected straddle positions will be determined under the rules that vary according to the election(s) made. The rules applicable under certain of the elections may operate to accelerate the recognition of gains or losses from the affected straddle positions. Because the straddle rules may affect the character of gains or loses, defer losses and/or accelerate the recognition of gains or losses from the affected straddle positions, the amount which may be reported to investors and which will be taxable to them as ordinary income or long-term capital gain, may be increased or decreased as compared to an Index Fund that did not engage in such hedging transactions.

Foreign Income

Income received by a Fund from sources within foreign countries may be subject to withholding and other foreign taxes. Tax conventions between certain countries and the United States may reduce or eliminate such taxes. It is impossible to determine the effective rate of foreign tax in advance since the amount of a Fund's assets to be invested in various countries will vary. If a Fund is liable for foreign taxes, and if more than 50% of the value of the Fund's total assets at the close of its taxable year consists of stocks or securities of foreign corporations, the Fund may make an election pursuant to which certain foreign taxes paid by it would be treated as having been paid directly by its shareholders. Pursuant to such election, the Fund's share of the amount of foreign taxes paid by it will be included in the income of its shareholders, and such shareholders (except tax-exempt shareholders) may, subject to certain limitations, claim either a credit or deduction for the taxes. Each Fund's investors will be notified after the close of a Fund's taxable year as to the foreign taxes that will "pass through" for that year and, if so, such notification will designate (a) the regulated investment company investor's portion of the foreign taxes paid to each such country and (b) the portion which represents income derived form sources within each such country.

The amount of foreign taxes for which an investor may claim a credit in any year will generally be subject to a separate limitation for "passive income," which includes, among other items of income, dividends, interests and certain foreign currency gains. Because capital gains realized by a Fund on the sale of foreign securities will be treated as U.S.-source income, the available credit of foreign taxes paid with respect to such gains may be restricted by this limitation. In addition a shareholder must hold shares of a Fund (without protection from risk or loss) on the ex-dividend date and for at least 16 days during the 30-day period beginning on the

33

date that is 15 days before the ex-dividend date in order to be eligible to claim a foreign tax credit passed through by the Fund.

The Aggregate Bond Index Fund's Investments in Original Issue Discount Securities

The Aggregate Bond Index Fund's investment in securities issued at a discount and certain other obligations will (and investments in securities purchased at a discount may) require the Fund to accrue and distribute income not yet received. In such cases, the Aggregate Bond Index Fund may be required to sell assets (including when it is not advantageous to do so) to generate the cash necessary to distribute as dividends to its shareholders all of its income and gains and therefore to eliminate any tax liability at the Fund level.

Redemptions and Exchanges

Redemptions and exchanges of each Fund's shares are taxable events and, accordingly, shareholders may realize gain or loss on these transactions. In general, any gain realized upon a taxable disposition of shares will be treated as long-term capital gain if the shares have been held for more than one year. Otherwise, the gain on the sale, exchange or redemption of Fund shares will be treated as short-term capital gain. However, if a shareholder sells Fund shares at a loss within six months after purchasing the shares, the loss will be treated as a long-term capital loss to the extent of any long-term capital gain distributions received by the shareholder. Furthermore, no loss will be allowed on the sale of Fund shares to the extent the shareholder acquired other shares of the same Fund within 30 days prior to the sale of the loss shares or 30 days after such sale.

The foregoing discussion summarizes some of the consequences under the current federal tax law of an investment in the Funds. It is not a substitute for personal tax advice. Consult your personal tax advisor about the potential tax consequences of an investment in the Fund including in-kind transactions under all applicable tax laws.

Non-U.S. investors in the Funds should consult their tax advisors concerning the tax consequences of ownership of shares in the Funds, including the possibility that distributions may be subject to a 30 percent United States withholding tax (or a reduced rate of withholding provided by treaty). Some investors may be subject to a withholding tax on distributions of ordinary income, capital gains and any cash received on redemption of shares in the Funds. The backup withholding rates are currently: 30% during 2002-2003; 29% during 2004-2005; 28% during 2006-2010; and 31% -- 2011 and thereafter. Generally, investors subject to backup withholding will be those for whom no certified taxpayer identification number is on file with the Trust or who, to the Trust's knowledge, have furnished an incorrect number. When establishing an account, an investor must certify under penalty of perjury that such number is correct and that such investor is not otherwise subject to backup withholding.

UNDERWRITERS

34

ALPS Distributors, Inc. serves as Distributor (the "Distributor") pursuant to the Distribution Agreement by and between the Distributor and the Trust. The Distributor is located at 370 17th Street, Suite 3100, Denver, Colorado 80202. Pursuant to the Distribution Agreement, the Funds pay the Distributor fees under the Rule 12b-1 Plan in effect for the Funds. For a description of the fees paid to the Distributor under the Rule 12b-1 Plan, see "Rule 12b-1 Plan," above. The Distributor is not obligated to sell any specific number of shares and will sell shares of a Fund on a continuous basis only against orders to purchase shares.

CALCULATION OF PERFORMANCE DATA

MONEY MARKET FUND:

The yield for the Money Market Fund is calculated daily based upon the seven days ending on the date of calculation ("base period"). The yields are computed by determining the net change, exclusive of capital changes and income other than investment income, in the value of a hypothetical pre-existing account having a balance of one share at the beginning of the base period, subtracting a hypothetical charge reflecting deductions from shareholder accounts and dividing the net change in the account value by the value of the account at the beginning of the base period to obtain the base period return, and then multiplying the base period return by (365/7) with the resulting yield figure carried to the nearest hundredth of one percent.

The Money Market Fund calculates an effective yield by determining the net change, exclusive of capital changes and income other than investment income, in the value of a hypothetical pre-existing account having a balance of one share at the beginning of the period, subtracting a hypothetical charge reflecting deductions from shareholder accounts, and dividing the difference by the value of the account at the beginning of the base period to obtain the base period return, and then compounding the base period return by adding 1, raising the sum to a power equal to 365 divided by 7, and subtracting 1 from the result, according to the following formula:

EFFECTIVE YIELD=[(BASE PERIOD RETURN+1)[365/7]] - 1

The Money Market Fund calculates its tax equivalent current yield by dividing that portion of a Fund's yield, as described above, that is tax-exempt by 1 minus a stated income tax rate and adding the quotient to that portion, if any, of the Fund's yield that is not tax-exempt.

The Money Market Fund calculates its tax equivalent effective yield by dividing that portion of a Fund's effective yield, as described above, that is tax-exempt by 1 minus a stated income tax rate and adding the quotient to that portion, if any, of the Fund's effective yield that is not tax-exempt.

ALL FUNDS:

Average Annual Total Return

The Funds' "average annual total return" figures shown below are computed according to a formula prescribed by the SEC. The formula can be expressed as follows:

35

n P(1+T) =ERV

Where:

P        =        a hypothetical initial payment of $1000.
T        =        average annual total return.
n        =        number of years.
ERV      =        Ending Redeemable Value of a hypothetical
                  $1,000 payment made at the beginning of the
                  1-, 5-, or 10-year periods at the end of
                  such periods, assuming reinvestment of all
                  dividends and distributions.

The Equity 500 Index Fund Class A Shares' average annual total returns as of December 31, 2001 are as follows:

Life of Fund (since April 18, 2001) (2.97%)

Average Annual Total Return After Taxes on Distributions

The Funds' "average annual total return after taxes on distributions" figures shown below are computed according to a formula prescribed by the Commission. The formula can be expressed as follows:

n P(1+T) =ATV

D

Where:

P        =        a hypothetical initial payment of $1000.
T        =        average annual total return.
n        =        number of years.
ATV      =        ending value of a hypothetical $1,000
   D              payment made at the beginning of the 1-, 5-,
                  or 10-year periods at the end of such
                  periods, after taxes on fund distributions
                  but not after taxes on redemption.

The Equity 500 Index Fund Class A Shares' average annual total returns after taxes on distributions as of December 31, 2001 are as follows:

Life of Fund (since April 18, 2001) (3.29%)

Average Annual Total Return After Taxes on Distributions and Redemptions

The Funds' "average annual total return after taxes on distributions and redemptions" figures shown below are computed according to a formula prescribed by the SEC. The formula can be expressed as follows:

n P(1+T) =ATV
DR

36

Where:

P        =        a hypothetical initial payment of $1000.
T        =        average annual total return.
n        =        number of years.
ATV      =        ending value of a hypothetical $1,000
   DR             payment made at the beginning of the 1-, 5-,
                  or 10-year periods at the end of such
                  periods, after taxes on fund distributions
                  and redemption.

The Equity 500 Index Fund Class A Shares' average annual total returns after taxes on distributions and redemptions as of December 31, 2001 are as follows:

Life of Fund (since April 18, 2001) (1.81%)

30-Day Yield

In addition to total return, the Funds may quote performance in terms of a 30-day yield. The yield figures provided will be calculated according to a formula prescribed by the SEC and can be expressed as follows:

                                       6
         Yield =         2[({a-b/cd}+1) - 1]

Where:
               a =      dividends and interest earned during the period.
               b =      expenses accrued for the period (net of reimbursements).
               c =      the average daily number of shares outstanding
                        during the period that were entitled to receive
                        dividends.

               d =      the maximum offering price per share on the last day of
                        the period.

For the purpose of determining the interest earned (variable "a" in the formula) on debt obligations that were purchased by a Fund at a discount or premium, the formula generally calls for amortization of the discount or premium; the amortization schedule will be adjusted monthly to reflect changes in the market value of the debt obligations.

Under this formula, interest earned on debt obligations for purposes of "a" above, is calculated by (1) computing the yield to maturity of each obligation held by a Fund based on the market value of the obligation (including actual accrued interest) at the close of business on the last day of each month, or, with respect to obligations purchased during the month, the purchase price (plus actual accrued interest), (2) dividing that figure by 360 and multiplying the quotient by the market value of the obligation (including actual accrued interest as referred to above) to determine the interest income on the obligation in a Fund's portfolio (assuming a month of 30 days) and (3) computing the total of the interest earned on all debt obligations during the 30-day or one month period. Undeclared earned income, computed in accordance with generally accepted accounting principles, may be subtracted from the maximum offering price calculation

37

required pursuant to "d" above.

The Funds calculate their tax equivalent 30-day yield quotations by dividing that portion of the Fund's yield, as described above, that is tax-exempt by 1 minus a stated income tax rate and adding the quotient to that portion, if any, of the Fund's yield that is not tax-exempt.

The Funds' performance will vary from time to time depending on market conditions, the composition of its portfolio and operating expenses. Consequently, any given performance quotation should not be considered representative of the performance of a Fund for any specified period in the future. Because performance will vary, it may not provide a basis for comparing an investment in shares of a Fund with certain bank deposits or other investments that may pay a fixed return for a stated period of time. Investors comparing a Fund's performance with that of other mutual funds should give consideration to the nature, quality and maturity of the respective investment companies' portfolio securities and market conditions. An investor's principal is not guaranteed by the Funds.

FINANCIAL STATEMENTS

The audited financial statements for the fiscal year ended December 31, 2001 for Equity 500 Index Fund are included in its Annual Report, which were filed with the SEC on February 28, 2002, and are incorporated into this SAI by reference.

38

Appendix A

RATINGS OF DEBT INSTRUMENTS

MOODY'S INVESTORS SERVICE, INC. ("MOODY'S") - LONG TERM DEBT RATINGS. The
following is a description of Moody's debt instrument ratings.

Aaa - Bonds that are rated Aaa are judged to be of the best quality. They carry the smallest degree of investment risk and are generally referred to as "gilt edged." Interest payments are protected by a large or exceptionally stable margin, and principal is secure. While the various protective elements are likely to change, such changes as can be visualized are most unlikely to impair the fundamentally strong position of such issues.

Aa - Bonds that are rated Aa are judged to be of high quality by all standards. Together with the Aaa group they comprise what are generally known as high-grade bonds. They are rated lower than the best bonds because margins of protection may not be as large as in Aaa securities, fluctuation of protective elements may be of greater amplitude, or there may be other elements present that make the long-term risk appear somewhat larger than that of the Aaa securities.

A - Bonds that are rated A possess many favorable investment attributes and are to be considered as upper-medium-grade obligations. Factors giving security to principal and interest are considered adequate, but elements may be present that suggest a susceptibility to impairment sometime in the future.

Moody's applies numerical modifiers 1, 2 and 3 in each generic rating classification from Aa through B. The modifier 1 indicates that the obligation ranks in the higher end of its generic rating category; the modifier 2 indicates a midrange ranking; and the modifier 3 indicates a ranking in the lower end of that generic rating category.

STANDARD & POOR'S RATING GROUP ("S&P"). S&P's ratings are based, in varying degrees, on the following considerations: (i) the likelihood of default - capacity and willingness of the obligor as to the timely payment of interest and repayment of principal in accordance with the terms of the obligation; (ii) the nature of and provisions of the obligation; and (iii) the protection afforded by, and relative position of, the obligation in the event of bankruptcy, reorganization, or other arrangement under the laws of bankruptcy and other laws affecting creditors' rights.

AAA - Debt rated AAA has the highest rating assigned by S&P. Capacity to pay interest and repay principal is extremely strong.

AA - Debt rated AA has a very strong capacity to pay interest and repay principal and differs from the highest rated issues only in small degree.

39

A - Debt rated A has a strong capacity to pay interest and repay principal, although it is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than debt in higher rated categories.

Plus (+) or minus (-): The ratings from AA to CCC may be modified by the addition of a plus or minus sign to show relative standing within the major rating categories.

RATINGS OF COMMERCIAL PAPER

MOODY'S. Moody's short-term debt ratings are opinions of the ability of issuers to repay punctually senior debt obligations. These obligations have an original maturity not exceeding one year, unless explicitly noted. Moody's employs the following three designations, all judged to be investment grade, to indicate the relative repayment ability of rated issuers:

Issuers rated Prime-1 (or supporting institutions) have a superior ability for repayment of senior short-term debt obligations. Prime-1 repayment ability will often be evidenced by many of the following characteristics:

- Leading market positions in well-established industries.

- High rates of return on funds employed.

- Conservative capitalization structure with moderate reliance on debt and ample asset protection.

- Broad margins in earnings coverage of fixed financial charges and high internal cash generation.

- Well-established access to a range of financial markets and assured sources of alternate liquidity.

Issuers rated Prime-2 (or supporting institutions) have a strong ability for repayment of senior short-term debt obligations. This will normally be evidenced by many of the characteristics cited above but to a lesser degree. Earnings trends and coverage ratios, while sound, may be more subject to variation. Capitalization characteristics, while still appropriate, may be more affected by external conditions. Ample alternative liquidity is maintained.

Issuers rated Not Prime do not fall within any of the Prime rating categories.

S&P. An S&P commercial paper rating is a current assessment of the likelihood of timely payment of debt considered short-term in the relevant market. Ratings are graded into several categories, ranging from A-1 for the highest quality obligations to D for the lowest. These categories are as follows:

A-1 - This highest category indicates that the degree of safety regarding timely payment is strong. Those issues determined to possess extremely strong safety characteristics are deemed with a plus sign (+) designation.

A-2 - Capacity for timely payment on issues with this designation is satisfactory. However, the relative degree of safety is not as high as for issues designated A-1.

40

FITCH, INC. ("FITCH"). Commercial paper rated by Fitch reflects Fitch's current appraisal of the degree of assurance of timely payment of such debt. An appraisal results in the rating of an issuer's paper as F-1, F-2, F-3, or F-4.

F-1 - This designation indicates that the commercial paper is regarded as having the strongest degree of assurance for timely payment.

F-2 - Commercial paper issues assigned this rating reflect an assurance of timely payment only slightly less in degree than those issues rated F-1.

41

PART C

ITEM 23. EXHIBITS

(a)(1) Declaration of Trust was filed previously as Exhibit (a) to the Trust's Registration Statement and is incorporated by reference herein.

   (2)            Form of Amendment No.1 to Agreement and Declaration of Trust
                  is filed herewith.


(b)               By-laws of the Trust were filed previously as Exhibit (b) to
                  the Trust's Registration Statement and are incorporated by
                  reference herein.


(c)               Not applicable.

(d)(1) Investment Advisory Agreement was filed previously as Exhibit
(d) to the Trust's Registration Statement and is incorporated by reference herein.

   (2)            Investment Advisory Agreement between SSgA Funds Management,
                  Inc. and the Trust is filed herewith.

   (3)            Form of Amendment to Investment Advisory Contract between SSgA
                  Funds Management, Inc. and the Trust is filed herewith.

(e)(1)            Distribution Agreement between ALPS Distributors, Inc. and the
                  Trust is filed herewith.

   (2)            Addendum to Distribution Agreement between ALPS Distributors,
                  Inc. and the Trust is filed herewith.

   (3)            Form of Amendment to Distribution Agreement between ALPS
                  Distributors, Inc. and the Trust is filed herewith.

(f)               Not applicable.

(g)(1)            Amended and Restated Custodian Agreement between State Street
                  Bank and Trust Company and the Trust is filed herewith.

(h)(1)            Transfer Agent and Services Agreement between State Street
                  Bank and Trust Company and the Trust is filed herewith.

   (2)            Administration Agreement between State Street Bank and Trust
                  Company and the Trust is filed herewith.

(i)(1)            Legal Opinion of Ropes & Gray was filed previously as Exhibit
                  (i) to Pre-effective Amendment No. 1 to the Trust's
                  Registration Statement and is incorporated by reference
                  herein.


   (2)            Legal Opinion of Ropes & Gray regarding the State Street Money
                  Market Fund will be filed by subsequent amendment.


(j)(1)            Power of Attorney for James B. Little dated February 4, 2000
                  was filed previously as Exhibit (j)(1) to the Trust's
                  Registration Statement and is incorporated by reference
                  herein.

(j)(2)            Power of Attorney for all Trustees dated February 28, 2000 was
                  filed previously as Exhibit (j)(2) to Pre-effective Amendment
                  No. 1 to the Trust's Registration Statement and is
                  incorporated by reference herein.

(j)(3)            Power of Attorney for Kathleen C. Cuocolo dated August 10,
                  2000 was filed previously as Exhibit (j)(3) to Pre-effective
                  Amendment No. 1 to the Trust's Registration Statement and is
                  incorporated by reference herein.


(j)(4)            Consent of Ernst & Young LLP is filed herewith.

(k)               Not applicable.

(l)               Not applicable.

(m)               Rule 12b-1 Plan is filed herewith.


(n)               Form of Rule 18f-3 Plan was filed previously as Exhibit (n) to
                  the Trust's Registration Statement and is incorporated by
                  reference herein.

(p)(1)            Code of Ethics was filed previously as Exhibit (p)(1) to the
                  Trust's Registration Statement and is incorporated by
                  reference herein.

(p)(2)            Code of Ethics of State Street Master Funds was filed
                  previously as Exhibit (p)(2) to Pre-effective Amendment No. 1
                  to the Trust's Registration Statement and is incorporated by
                  reference herein.

(p)(3)            Code of Ethics of State Street Global Advisors was filed
                  previously as Exhibit (p)(3) to Pre-effective Amendment No. 1
                  to the Trust's Registration Statement and is incorporated by
                  reference herein.

(p)(4)            Code of Ethics of SSgA Funds Management, Inc. was filed
                  previously as Exhibit (p)(4) to Post-Effective Amendment No. 1
                  to the Trust's Registration Statement and is incorporated by
                  reference herein.

(p)(5)            Code of Ethics of ALPS Mutual Funds Services, Inc. was filed
                  previously as Exhibit (p)(4) to Pre-effective Amendment No. 1
                  to The Trust's Registration Statement and is incorporated by
                  reference herein.

ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE FUND

None.

ITEM 25. INDEMNIFICATION

The Trust shall indemnify each of its Trustees and officers (including persons who serve at the Trust's request as directors, officers or trustees of another organization in which the Trust has any interest as a shareholder, creditor or otherwise) (hereinafter referred to as a "Covered Person") against all liabilities and expenses, including but not limited to amounts paid in satisfaction of judgments, in compromise or as fines and penalties, and counsel fees reasonably incurred by any Covered Person in connection with the defense or disposition of any action, suit or other proceeding, whether civil or criminal, before any court or administrative or legislative body, in which such Covered Person may be or may have been involved as a party or otherwise or with which such Covered Person may be or may have been threatened, while in office or thereafter, by reason of any alleged act or omission as a Trustee or officer or by reason of his or her being or having been such a Trustee or officer, except with respect to any matter as to which such Covered Person shall have been finally adjudicated in any such action, suit or other proceeding not to have acted in good faith in the reasonable belief that such Covered Person's action was in the best interest of the Trust and except that no Covered Person shall be indemnified against any liability to the Trust or its Shareholders to which such Covered Person would otherwise be subject by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of such Covered Person's office. Expenses, including counsel fees so incurred by any such Covered Person, may be paid from time to time by the Trust in advance of the final disposition of any such action, suit or proceeding on the condition that the amounts so paid shall be repaid to the Trust if it is ultimately determined that indemnification of such expenses is not authorized under this Article.

As to any matter disposed of by a compromise payment by any such Covered Person referred to above, pursuant to a consent decree or otherwise, no such indemnification either for said payment or for any other expenses shall be provided unless such compromise shall be approved as in the best interests of the Trust, after notice that it involved such indemnification, (a) by a disinterested majority of the Trustees then in office; or (b) by a majority of the disinterested Trustees then in office; or (c) by any disinterested person or persons to whom the question may be referred by the Trustees, provided that in the case of approval pursuant to clause (b) or (c) there has been obtained an opinion in writing of independent legal counsel to the effect that such Covered Person appears to have acted in good faith in the reasonable belief that his or her action was in the best interests of the Trust and that such indemnification would not protect such person against any liability to the Trust or its Shareholders to which such


person would otherwise be subject by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of office; or (d) by vote of Shareholders holding a majority of the Shares entitled to vote thereon, exclusive of any Shares beneficially owned by any interested Covered Person. Approval by the Trustees pursuant to clause (a) or (b) or by any disinterested person or persons pursuant to clause (c) of this Section shall not prevent the recovery from any Covered Person of any amount paid to such Covered Person in accordance with any of such clauses as indemnification if such Covered Person is subsequently adjudicated by a court of competent jurisdiction not to have acted in good faith in the reasonable belief that such Covered Person's action was in the best interests of the Trust or to have been liable to the Trust or its Shareholders by reason of willful misfeasance, bad faith, gross negligence or reckless disregard of the duties involved in the conduct of such Covered Person's office.

The right of indemnification hereby provided shall not be exclusive of or affect any other rights to which any such Covered Person may be entitled. As used in this Article 4, the term "Covered Person" shall include such person's heirs, executors and administrators; an "interested Covered Person" is one against whom the action, suit or other proceeding in question or another action, suit or other proceeding on the same or similar grounds is then or has been pending; and a "disinterested Trustee" or "disinterested person" is a Trustee or a person against whom none of such actions, suits or other proceedings or another action, suit or other proceeding on the same or similar grounds is then or has been pending. Nothing contained in this Article shall affect any rights to indemnification to which personnel of the Trust, other than Trustees and officers, and other persons may be entitled by contract or otherwise under law, nor the power of the Trust to purchase and maintain liability insurance on behalf of any such person.

ITEM 26. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER

See "Management of the Trust" in Part B. Information as to the directors and officers of the Adviser is included in its Form ADV filed with the SEC and is incorporated herein by reference thereto.

ITEM 27. PRINCIPAL UNDERWRITER

(a) The sole principal underwriter for the Fund is ALPS Distributors, Inc. which acts as distributor for the Trust and the following other funds: Westcore Trust, Financial Investors Trust, First Funds Trust, Stonebridge Funds Trust, SPDR Trust, MidCap SPDR Trust, DIAMONDS Trust, Select Sector SPDR Trust, Nasdaq 100 Trust, Firsthand Funds, and Financial Investors Variable Insurance Trust.

(b) To the best of the Trust's knowledge, the directors and executive officers of ALPS Distributors, Inc., the distributor for the Trust, are as follows:


Name and Principal                    Positions and Offices with Trust       Positions and Offices
Business Address*                                                            with Underwriter
----------------------------------------------------------------------------------------------------
W. Robert Alexander                   None                                   Chairman, Chief
                                                                             Executive Officer and
                                                                             Secretary

Thomas A. Carter                      None                                   Chief Financial Officer

Edmund J. Burke                       None                                   President and Director

Russell C. Burk                       None                                   General Counsel

Jeremy O. May                         None                                   Vice President

Rick A. Pederson                      None                                   Director

Chris Woessner                        None                                   Director


*All addresses are 370 Seventeenth Street, Suite 3100, Denver, Colorado 80202.

(c) Not Applicable

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS

The accounts and records of the Trust are located, in whole or in part, at the office of the Trust and the following locations:

State Street Institutional Investment Trust ("Trust") PO Box 5049 Boston, MA 02206

SSgA Funds Management, Inc. ("Adviser") Two International Place
Boston, MA 02110

State Street Bank and Trust Company ("Custodian, Administrator, Transfer Agent and Dividend Disbursing Agent") 225 Franklin Street
Boston, MA 02110

ALPS Distributors, Inc.
370 Seventeenth Street
Suite 3100
Denver, CO 80202


ITEM 29. MANAGEMENT SERVICES

Not applicable.

ITEM 30. UNDERTAKINGS

Not applicable.


SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 (the "1933 Act") and the Investment Company Act of 1940, the Registrant, State Street Institutional Investment Trust (the "Trust") certifies that it has meets all of the requirements for effectiveness of this amendment to the Trust's registration statement under Rule 485(b) under the 1933 Act and has duly caused this Amendment to the Trust's Registration Statement to be signed on its behalf by the undersigned, thereto duly authorized, in the City of Boston and Commonwealth of Massachusetts on the 30th day of April 2002.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

By: /s/ Kathleen C. Cuocolo
    ------------------------------------
        Kathleen C.  Cuocolo
        President

Pursuant to the requirements of the 1933 Act, this Registration Statement for the Trust has been signed below by the following persons in the capacities indicated on the 30th day of April 2002:

Signature                                            Title
---------                                            -----
/s/ Kathleen C. Cuocolo
----------------------------------------
    Kathleen C. Cuocolo                              President (Principal Executive Officer)


/s/ Janine Cohen
----------------------------------------
    Janine Cohen                                     Treasurer (Principal Accounting Officer)


                    *                                Trustee
----------------------------------------
    William L. Boyan

                        *                            Trustee
----------------------------------------
    Michael F. Holland

                        *                            Trustee
----------------------------------------
    Rina K. Spence

                        *                            Trustee
----------------------------------------
    Douglas T. Williams

* Attorney-in-fact: /s/ Julie A. Tedesco
                    --------------------


STATE STREET INSTITUTIONAL INVESTMENT TRUST

INDEX TO EXHIBITS

Exhibit
Number     Description of Exhibit
-------    ----------------------
(a)(2)     Form of Amendment No. 1 to Agreement and Declaration of Trust

(d)(2)     Investment Advisory Agreement between SSgA Funds Management, Inc. and
           the Trust

(d)(3)     Form of Amendment to Investment Advisory Agreement between SSgA Funds
           Management, Inc. and the Trust

(e)(1)     Distribution Agreement between ALPS Distributors, Inc. and the Trust

(e)(2)     Addendum to Distribution Agreement between ALPS Distributors, Inc.
           and the Trust

(e)(3)     Form of Amendment to Distribution Agreement between ALPS
           Distributors, Inc. and the Trust

(g)(1)     Amended and Restated Custodian Agreement between State Street Bank
           and Trust Company and the Trust

(h)(1)     Transfer Agent and Services Agreement between State Street Bank and
           Trust Company and the Trust

(h)(2)     Administration Agreement between State Street Bank and Trust Company
           and the Trust

(j)(4)     Consent of Ernst & Young LLP

(m)        Rule 12b-1 Plan


EXHIBIT 99.(a)(2)

STATE STREET INSTITUTIONAL INVESTMENT TRUST

AMENDMENT NO. 1 TO AGREEMENT AND DECLARATION OF TRUST

AMENDMENT NO. 1 to the Agreement and Declaration of Trust of State Street Institutional Investment Trust (the "Trust"), dated February 16, 2000 (the "Agreement"), made at Boston, Massachusetts this 14th day of February 2002.

WHEREAS, the Trustees desire to establish and designate two new Series of Shares called "State Street Money Market Fund" and "State Street U.S. Government Money Market Fund," and

WHEREAS, Section 5 of Article III of the Agreement provides that the establishment and designation of any Series of Shares in addition to the Series established and designated in Section 6 of Article III shall be effective upon the execution by a majority of the then Trustees of an amendment to the Agreement, taking the form of a complete restatement or otherwise, setting forth such establishment and designation and the relative rights and preferences of such Series, or as otherwise provided in such instrument;

NOW, THEREFORE, the undersigned Trustees hereby amend the Agreement as follows:

The first paragraph of Section 6 of Article III of the Agreement is hereby deleted in its entirety and the following paragraph is hereby substituted therefor:

Section 6. Establishment and Designation of Series and Classes. Without limiting the authority of the Trustees set forth in Section 5, inter alia, to establish and designate any further Series or classes or to modify the rights and preferences of any Series or class, the following Series of Shares be, and hereby are, established and designated as Multi-Class Series:

Name of Series                              Effective Date:
--------------                              ---------------
State Street Equity 500 Index Fund          February 28, 2000
State Street Equity 400 Index Fund          February 28, 2000
State Street Equity 2000 Index Fund         February 28, 2000
State Street MSCI EAFE Index Fund           February 28, 2000
State Street Aggregate Bond Index Fund      February 28, 2000
State Street Money Market Fund              February 14, 2002
State Street U.S. Government
Money Market Fund                           February 14, 2002

IN WITNESS WHEREOF, the undersigned hereunto have set their hands in the City of Boston, Commonwealth of Massachusetts, as of the 14th day of February 2002.

------------------------------                    ------------------------------
William L. Boyan                                  Rina K. Spence


------------------------------                    ------------------------------
Michael F. Holland                                Douglas T. Williams


EXHIBIT 99.(d)(2)

INVESTMENT ADVISORY AGREEMENT
BETWEEN
SSGA FUNDS MANAGEMENT, INC.
AND
STATE STREET INSTITUTIONAL INVESTMENT TRUST

This Agreement is made as of this 1st day of May, 2001, between State Street Institutional Investment Trust, a Massachusetts business trust (the "Trust"), and SSgA Funds Management, Inc., a Massachusetts corporation (the "Adviser").

WHEREAS, the Trust is an open-end management investment company registered under the Investment Company Act of 1940, as amended (the "1940 Act"), currently consisting of the five separate portfolio series set forth on Exhibit A to this Agreement (each a "Fund" and collectively, the "Initial Funds"), each having its own investment policies; and

WHEREAS, the Adviser is in the business of providing investment advisory services; and

WHEREAS, the Trust desires to retain the Adviser to render investment advisory services to the Trust with respect to the Initial Funds and such other series subsequently established by the Trust and made subject to this Agreement in accordance with paragraph 1(b) (the "Additional Funds") (the Initial Funds together with the Additional Funds being referred to herein as the "Funds"), and the Adviser is willing to render such services;

NOW, THEREFORE, in consideration of the mutual agreements contained herein, the Trust and Adviser agree as follows:

1. APPOINTMENT OF ADVISER.

(a) Initial Funds: The Trust hereby appoints the Adviser to act as investment adviser to the Initial Funds for the period and on the terms set forth in this Agreement. The Adviser accepts such appointment and agrees to render the services herein set forth, for the compensation herein provided. The Trust warrants that the Adviser has been duly appointed to act hereunder.

(b) Additional Funds: In the event that the Trust establishes one or more series other than the Initial Funds with respect to which it desires to retain the Adviser to render investment advisory services hereunder, it shall so notify the Adviser in writing, indicating the advisory fee to be payable with respect to each Additional Fund. If the Adviser is willing to render such services at such fee, it shall so notify the Trust in writing, whereupon each such Additional Fund shall become a Fund hereunder. In such

-1-

event, a writing signed by both the Trust and the Adviser shall be annexed hereto as a part hereof indicating that each such Additional Fund has become a Fund hereunder and reflecting the agreed-upon fee schedule for each such Additional Fund.

2. ADVISORY DUTIES. Subject to the supervision of the Board of Trustees of the Trust (the "Board"), the Adviser shall manage the investment operations and determine the composition of the portfolio of each Fund, including the purchase, retention and disposition of the securities and other instruments held by the Fund, in accordance with such Fund's investment objective and policies as stated in the then current prospectus and Statement of Additional Information for such Fund contained in the Trust's Registration Statement on Form N-1A (the "Registration Statement"), as such prospectus and Statement of Additional Information are amended or supplemented from time to time. The Adviser's duties hereunder are subject to the following understandings:

(a) The Adviser shall provide supervision of investments, furnish a continuous investment program for the Funds, determine from time to time what investments or securities will be purchased, retained or sold by the Funds, and what portion of the assets will be invested or held uninvested as cash;

(b) The Adviser, in the performance of its duties and obligations under this Agreement, shall act in conformity with the Trust's Declaration of Trust, By-Laws, Registration Statement, and with the instructions and directions of the Board, provided, however, the Adviser shall not be responsible for acting contrary to any of the foregoing that are changed without notice of such change to the Adviser; and the Adviser shall conform to and comply with the applicable requirements of the 1940 Act and all other applicable federal or state laws and regulations;

(c) The Adviser shall promptly communicate to the officers and Trustees of the Trust such information relating to transactions of the Funds as they may reasonably request. On occasions when the Adviser deems the purchase or sale of a security to be in the best interest of a Fund as well as other clients, the Adviser, to the extent permitted by applicable laws and regulations, may aggregate the securities to be sold or purchased, provided that all accounts are treated equitably and fairly. In such event, allocation of the securities so purchased or sold, as well as the expenses incurred in the transactions, shall be made by the Adviser in the manner it considers to be the most equitable and consistent with its fiduciary obligations to the Trust and to such other clients;

(d) The Adviser shall maintain books and records with respect to the Trust's securities transactions and shall render to the Board such periodic and special reports as the Board may reasonably request;

(e) The Adviser shall provide the Trust with a list of all securities transactions as reasonably requested by the Trust;

-2-

(f) The investment advisory services of the Adviser to the Trust under this Agreement are not to be deemed exclusive, and the Adviser shall be free to render similar services to others.

(g) With respect to any Fund of the Trust, for so long as all investable assets of the Fund are invested in a Portfolio of the State Street Master Trust or another investment company with substantially the same investment objectives and policies as the Fund (a "Master Fund"), the Adviser's duties with respect to that Fund shall be to monitor the services of the Master Fund to determine if an investment in the Master Fund remains appropriate.

3. EXECUTION AND ALLOCATION OF PORTFOLIO BROKERAGE COMMISSIONS. The Adviser, subject to and in accordance with any directions which the Board may issue from time to time, shall place, in the name of the Trust, orders for the execution of the securities transactions in which any Fund is authorized to invest. When placing such orders, the primary objective of the Adviser shall be to obtain the best net price and execution ("best execution") for the Trust but this requirement shall not be deemed to obligate the Adviser to place any order solely on the basis of obtaining the lowest commission rate if the other standards set forth in this section have been satisfied. The Trust recognizes that there are likely to be many cases in which different brokers are equally able to provide such best execution and that, in selection among such brokers with respect to particular trades, it is desirable to choose those brokers who furnish "brokerage and research services" (as defined in Section 28(e)(3) of the Securities and Exchange Act of 1934) or statistical quotations and other information to the Trust and/or the Adviser in accordance with the standards set forth below. Moreover, to the extent that it continues to be lawful to do so and so long as the Board determines as a matter of general policy that the Trust and the respective Funds will benefit, directly or indirectly, by doing so, the Adviser may place orders with a broker who charges a higher commission than another broker would have charged for effecting that transaction, provided that the excess commission is reasonable in relation to the value of brokerage and research services provided by that broker. Accordingly, the Trust and the Adviser agree that the Adviser shall select brokers for the execution of any Fund's securities transactions from among:

(a) Those brokers and dealers who provide brokerage and research services, or statistical quotations and other information to the Trust, specifically including the quotations necessary to determine the Trust's net assets, in such amount of total brokerage as may reasonably be required in light of such services.

(b) Those brokers and dealers who provide brokerage and research services to the Adviser which relate directly to portfolio securities, actual or potential, of the Trust, or which place the Adviser in a better position to make decisions in connection with the management of the Trust's assets, whether or not such data may also be useful to the Adviser in managing other portfolios or advising other clients, in such amount of total brokerage as may reasonably be required.

-3-

The Adviser agrees that no investment decision will be made or influenced by a desire to provide brokerage for allocation in accordance with the foregoing, and that the right to make such allocation of brokerage shall not interfere with the Adviser's primary duty to obtain the best execution for the Trust.

4. BOOKS AND RECORDS. The Adviser shall keep the Trust's books and records required to be maintained by it pursuant to paragraph 2(d) hereof. The Adviser agrees that all records which it maintains for the Trust are the property of the Trust and it shall surrender promptly to the Trust any of such records upon the Trust's request. The Adviser further agrees to preserve for the periods prescribed by Rule 31a-2 of the Securities and Exchange Commission (the "Commission") under the 1940 Act any such records as are required to be maintained by Rule 31a-1(f) of the Commission under the 1940 Act. Nothing herein shall prevent the Adviser from maintaining its own records as required by law, which may be a duplication of the Trust's records.

5. REPORTS TO ADVISER. The Trust agrees to furnish the Adviser at its principal office all prospectuses, proxy statements, reports to stockholders, sales literature or other material prepared for distribution to shareholders of the Trust or the public, which refer in any way to the Adviser, if reasonably practicable ten (10) days prior to use thereof and not to use such material if the Adviser should object thereto in writing within seven (7) days after receipt of such material; provided, however, that the Adviser hereby approves all uses of its name which merely refer in accurate terms to its appointment as investment adviser hereunder, which merely identifies the Trust, or which are required by the Commission or a state securities commission. In the event of termination of this Agreement, the Trust shall, on written request of the Adviser, forthwith delete any reference to the Adviser from any materials described in the preceding sentence. The Trust shall furnish or otherwise make available to the Adviser such other information relating to the business affairs of the Trust as the Adviser at any time, or from time to time, reasonably requests in order to discharge its obligations hereunder.

6. PROXIES. Unless the Trust gives written instructions to the contrary, the Adviser shall vote or not vote all proxies solicited by or with respect to the issuers of securities in which assets of any Fund may be invested. The Adviser shall use its best good faith judgment to vote or not vote such proxies in a manner which best serves the interests of the Trust's shareholders. The Trust has received and reviewed the proxy guidelines of the Adviser which indicate how the Adviser will vote.

7. EXPENSES. During the term of this Agreement, the Adviser shall pay all of its own expenses incurred by it in connection with its activities under this Agreement. Each Fund of the Trust shall bear all expenses that are incurred in its operation except as provided in the Administration Agreement between State Street Bank and Trust Company and the Trust dated February 28, 2000. Said expenses to be borne by each Fund of the Trust will include, but not be limited to, the following (or the Fund's proportionate share of the following): (a) brokerage commissions relating to securities purchased or sold by the Fund or any losses incurred in connection therewith; (b) fees

-4-

payable to and expenses incurred on behalf of the Fund by the Trust's administrator; (c) expenses of organizing the Trust and the Fund; (d) fees and expenses of registering and maintaining the registration of the Fund's shares and the Trust under federal securities laws and making and maintaining any notice filings required under any state securities laws; (e) fees and salaries payable to the Trust's Trustees and officers who are not officers or employees of the Adviser or any underwriter of the Trust; (f) taxes (including any income or franchise taxes) and governmental fees; (g) costs of any liability, uncollectible items of deposit and other insurance or fidelity bonds; (h) any costs, expenses or losses arising out of any liability of or claim for damage or other relief asserted against the Trust or the Fund for violation of any law;
(i) legal, accounting and auditing expenses, including legal fees of special counsel for the independent Trustees, if any; (j) charges of custodians, transfer agents and other agents; (k) costs of preparing share certificates (if any); (l) expenses of setting in type and printing prospectuses and Statements of Additional Information and supplements thereto for existing shareholders, reports and statements to shareholders and proxy material; (m) any extraordinary expenses (including fees and disbursements of counsel) incurred by the Trust or the Fund; and (n) fees and other expenses incurred in connection with membership in investment company organizations.

8. COMPENSATION OF THE ADVISER.

For so long as substantially all of the assets of each Fund are invested in the corresponding Portfolio of State Street Master Funds, no fees shall be received for the services to be rendered by the Adviser under this Agreement; otherwise, the Adviser shall receive fees, payable monthly, at the following annual rates (expressed as a percentage of the average daily net assets of each Fund):

State Street Equity 500 Index Fund              .045%
State Street Equity 400 Index Fund              .08%
State Street Equity 2000 Index Fund             .10%
State Street MSCI(R) EAFE(R) Index Fund         .15%
State Street Aggregate Bond Index Fund          .10%

9. LIMITATION OF ADVISER'S LIABILITY. In the absence of (a) willful misfeasance, bad faith or gross negligence on the part of the Adviser in performance of its obligations and duties hereunder, (b) reckless disregard by the Adviser of its obligations and duties hereunder, or (c) a loss resulting from a breach of fiduciary duty with respect to the receipt of compensation for services (in which case, any award of damages shall be limited to the period and the amount set forth in Section 36(b)(3) of the 1940 Act), the Adviser shall not be subject to any liability whatsoever to the Trust, or to any shareholder of the Trust, for any error of judgment, mistake of law or any other act or omission in the course of, or connected with, rendering services hereunder including, without limitation, for any losses that may be sustained in connection with the purchase, holding, redemption or sale of any security on behalf of the Trust.

-5-

10. DURATION AND TERMINATION.

(a) This Agreement shall become effective with respect to each Initial Fund on the date hereof, or, with respect to any Additional Fund on the date of the written notification specified in Section 1(b). This Agreement, unless sooner terminated as provided herein, shall continue for each Fund for two years following the effective date of this Agreement with respect to the Fund, and thereafter shall continue for periods of one year so long as such continuance is specifically approved at least annually (a) by the vote of a majority of those members of the Board who are not parties to this Agreement or "interested persons" (as defined in the 1940 Act) of any such party, cast in person at a meeting called for the purpose of voting such approval, and (b) by the Board or by vote of a majority of the outstanding voting securities of the Fund in accordance with the provisions of the 1940 Act.

(b) This Agreement may be terminated by the Trust at any time, without the payment of any penalty, by the Board or by the majority vote of either the entire Board or by vote of a majority of the outstanding voting securities of the Fund (in accordance with the provisions of the 1940 Act) on 60 days' written notice to the Adviser. This Agreement may also be terminated by the Adviser on 90 days' written notice to the Trust. This Agreement will automatically and immediately terminate in the event of its assignment (as defined in the 1940 Act and the rules thereunder).

11. CHOICE OF LAW. This Agreement shall be construed in accordance with the laws of The Commonwealth of Massachusetts and any applicable federal law.

12. LIMITATION OF LIABILITY. The Declaration of Trust dated February 16, 2000, establishing the Trust, which is hereby referred to and a copy of which is on file with the Secretary of The Commonwealth of Massachusetts, provides that the name State Street Institutional Investment Trust means the Trustees from time to time serving (as Trustees but not personally) under such Declaration of Trust. It is expressly acknowledged and agreed that the obligations of the Trust hereunder shall not be binding upon any of the interest holders, Trustees, officers, employees or agents of the Trust, personally, but shall bind only the trust property of the Trust, as provided in its Declaration of Trust. The execution and delivery of this Agreement have been authorized by the Trustees of the Trust and signed by an officer of the Trust, acting as such, and neither such authorization by such Trustees nor such execution and delivery by such officer shall be deemed to have been made by any of them individually or to impose any liability on any of them personally, but shall bind only the trust property of the Trust as provided in its Declaration of Trust.

-6-

IN WITNESS WHEREOF, the due execution hereof as of the date first above written.

Attest: STATE STREET INSTITUTIONAL

INVESTMENT TRUST

By:  /s/David James                          By:   /s/Kathleen Cuocolo
                                                 -------------------------
                                                    Kathleen Cuocolo
                                                    President


Attest:                                      SSGA FUNDS MANAGEMENT, INC.


By:  /s/Mark Duggan                          By:  /s/Gustaff V. Fish, Jr.
                                                 -------------------------
                                             Name: Gustaff V. Fish, Jr.
                                             Title: President

-7-

EXHIBIT 99.(d)(3)

SSgA Funds Management, Inc.
Two International Place
Boston, Massachusetts 02110

Ladies and Gentlemen:

Reference is made to the Investment Advisory Agreement between us dated May 1, 2001 (the "Agreement").

Pursuant to the Agreement, this letter is to provide notice of the creation of two additional funds of the State Street Institutional Investment Trust (the "Trust"), namely the State Street Money Market Fund and the State Street U.S. Government Money Market Fund (the "New Funds").

We request that you act as Investment Advisor under the Agreement with respect to the New Funds. It is acknowledged by both parties that no payment for services is rendered pursuant to the Agreement for so long as substantially all of the assets of the New Funds are invested in the corresponding portfolio of the State Street Master Funds or another investment company with essentially the same investment objectives and policies as the New Funds; otherwise, you shall be entitled to receive fees, payable monthly equal to 0.10% of the average daily net assets of each of the New Funds.

Please indicate your acceptance of the foregoing by executing two copies of this letter, returning one to the Trust and retaining one copy for your records.

Very truly yours,

State Street Institutional Investment Trust

By:

Accepted:

SSgA Funds Management, Inc.

By:

Date: February 14, 2002


EXHIBIT 99.(e)(1)

DISTRIBUTION AGREEMENT

Distribution Agreement made this 28th day of February, 2000, by and between The State Street Institutional Investment Trust, a Massachusetts trust (the "Trust"), and ALPS Mutual Funds Services, Inc., a Colorado corporation (the "Distributor").

WHEREAS, the Trust is a registered open-end management investment company organized as a series trust offering a number of portfolios of securities (each a "Fund" and collectively the "Funds"), each investing primarily in interests of a portfolio of the State Street Master Trust, having filed with the Securities and Exchange Commission (the "Commission") a registration statement on Form N-1A under the Securities Act of 1933, as amended (the "1933 Act"), and the Investment Company Act of 1940, as amended;

WHEREAS, the Trust desires to retain the services of the Distributor in connection with the promotion and distribution of the shares of each Fund (the "Shares");

WHEREAS, the Board of Trustees of the Trust has adopted a plan of distribution (the "12b-1 Plan") pursuant to Rule 12b-1 under the 1940 Act with respect to each Fund and may make payments to the Distributor pursuant to such 12b-1 Plan, subject to and in accordance with the terms and conditions thereof and any related agreements;

WHEREAS, the Distributor is a registered broker-dealer under the Securities Exchange Act of 1934, as amended (the "1934 Act") and a member of the National Association of Securities Dealers ("NASD"); and

WHEREAS, the Distributor desires to provide such services to the Trust.

NOW, THEREFORE, in consideration of the mutual promises and undertakings herein contained, the parties agree as follows:

1. Appointment. The Trust hereby appoints the Distributor as the exclusive distributor for Shares of each Fund listed in Annex I hereto, as the same may be amended by the parties from time to time, on the terms and for the period set forth in this Agreement and subject to the registration requirements of the 1933 Act and of the laws governing the sale of securities in the various states, and the Distributor hereby accepts such appointment and agrees to act in such capacity hereunder.

2. Definitions. Wherever they are used herein, the following terms have the following respective meanings:

a. "1940 Act" means the Investment Company Act of 1940 and the rules and regulations thereunder as amended from time to time;

b. "Prospectus" means the Prospectus and Statement of Additional Information constituting parts of the Registration Statement of the Trust under the 1933 Act and the 1940 Act as such Prospectus and Statement of Additional Information may be amended or supplemented and filed with the Commission from time to time;


c. "Registration Statement" means the registration statement most recently filed from time to time by the Trust with the Commission and effective under the 1933 Act and the 1940 Act, as such registration statement is amended by any amendments thereto at the time in effect;

d. All capitalized terms used but not defined in this Agreement shall have the meanings ascribed to such terms in the Registration Statement and the Prospectus.

3. Duties of the Distributor.

(a) The Trust grants to the Distributor the right to sell the Shares as agent on behalf of each Fund, during the term of this Agreement, subject to the registration requirements of the 1933 Act and the 1940 Act and of the laws governing the sale of securities in the various states ("Blue Sky Laws"), under the terms and conditions set forth in this Agreement. The Distributor shall have the right to sell, as agent on behalf of each Fund, the Shares covered by the registration statement, prospectus and statement of additional information for the Trust then in effect under the 1933 Act and the 1940 Act.

(b) The Distributor agrees to act as agent of the Trust with respect to the continuous distribution of Shares of each Fund as set forth in the Registration Statement and in accordance with the provisions thereof. The Distributor further agrees as follows: (a) the Distributor shall generate and transmit confirmations of Share purchase order acceptances to the purchaser; (b) the Distributor shall deliver copies of the prospectus, included in the Registration Statement, to purchasers of such Shares and upon request the Statement of Additional Information; and (c) the Distributor shall maintain telephonic, facsimile and/or access to direct computer communications links with the Transfer Agent.

(c) The rights granted to the Distributor shall be nonexclusive in that the Trust reserves the right to sell Shares to investors on applications received and accepted by the Trust.

(d) The Distributor agrees to administer the Rule 12b-1 Plan on behalf of the Trust. The Distributor shall, at its own expense, set up and maintain a system of recording and payments for fees and reimbursement of expenses disseminated pursuant to this Agreement and any other related agreements under the Funds' Rule 12b-1 Plan and shall, pursuant to the 1940 Act, report such payment activity under the Rule 12b-1 Plan to the Trust at least quarterly.

(e) All activities by the Distributor and its agents and employees which are primarily intended to result in the sale of Shares shall comply with the Registration Statement and Prospectus, the instructions of the Board of Trustees of the Trust and all applicable laws, rules and regulations including, without limitation, all rules and regulations made or adopted pursuant to the 1940 Act by the Commission or any securities association registered under the 1934 Act, including the NASD.

(f) Except as otherwise noted in the Registration Statement and Prospectus, the offering price for all Shares will be the aggregate net asset value of the Shares of the relevant Fund, as determined in the manner described in the Registration Statement and Prospectus.

(g) If and whenever the determination of net asset value is suspended and until such suspension is terminated, no further orders for Shares will be processed by the Distributor except such unconditional orders as may have been placed with the Distributor before it had knowledge of the suspension. In addition, the Trust reserves the right to suspend sales and Distributor's authority to process orders for Shares on behalf of the Trust, upon due notice to the Distributor, if, in the judgment of

2

the Trust, it is in the best interests of the Trust to do so. Suspension will continue for such period as may be determined by the Trust.

(h) The Distributor is not authorized by the Trust to give any information or to make any representations other than those contained in the Registration Statement or Prospectus or contained in shareholder reports or other material that may be prepared by or on behalf of the Trust for the Distributor's use. The Distributor shall be entitled to rely on and shall not be responsible in any way for information provided to it by the Trust and its respective service providers and shall not be liable or responsible for the errors and omissions of such service providers, provided that the foregoing shall not be construed to protect the Distributor against any liability to the Trust or the Trust's shareholders to which the Distributor would otherwise be subject by reason of willful misfeasance, bad faith or gross negligence in the performance of its duties or by reason of its reckless disregard of its obligations and duties under this Agreement.

(i) The Board of Trustees shall approve the form of any Investor Services Agreement to be entered into by the Distributor.

(j) At the request of the Trust, the Distributor shall enter into agreements in the form specified by the Trust (each a "Participant Agreement") with participants in the system for book-entry of The Depository Trust Company and the NSCC as described in the Prospectus.

(k) The Distributor shall ensure that all direct requests for Prospectuses and Statements of Additional of Information are fulfilled. The Distributor will generally make it known in the brokerage community that prospectuses and statements of additional information are available, including by (i) making such disclosure in all marketing and advertising materials prepared and/or filed by the Distributor with the NASD, and (ii) as may otherwise be required by the Commission.

(l) The Distributor agrees to make available, at the Trust's request, one or more members of its staff to attend Board meetings of the Trust in order to provide information with regard to the ongoing distribution process and for such other purposes as may be requested by the Board of Trustees of the Trust.

4. Duties of the Trust.

(a) The Trust agrees to issue Shares of each Fund and to request The Depository Trust Company to record on its books the ownership of such Shares in accordance with the book-entry system procedures described in the Prospectus in such amounts as the Distributor has requested through the Transfer Agent in writing or by other means of data transmission, as promptly as practicable after receipt by the Trust of the requisite purchase price and acceptance of such order, upon the terms described in the Registration Statement. The Trust may reject any order for Shares or stop all receipts of such orders at any time upon reasonable notice to the Distributor, in accordance with the provisions of the Prospectus.

(b) The Trust agrees that it will take all action necessary to register an indefinite number of Shares under the 1933 Act. The Trust will make available to the Distributor such number of copies of its then currently effective Prospectus as the Distributor may reasonably request. The Trust will furnish to the Distributor copies of all information, financial statements and other papers that the Distributor may reasonably request for use in connection with the distribution of Shares. The Trust shall keep the Distributor informed of the jurisdictions in which Shares of the Trust are authorized for sale and shall promptly notify the Distributor of any change in this information. The Distributor shall not be liable for

3

damages resulting from the sale of Shares in authorized jurisdictions where the Distributor had no information from the Trust that such sale or sales were unauthorized at the time of such sale or sales.

(c) The Trust represents to the Distributor that the Registration Statement and Prospectus filed by the Trust with the Commission with respect to the Trust have been prepared in conformity with the requirements of the 1933 Act, the 1940 Act and the rules and regulations of the Commission thereunder. The Trust will notify the Distributor promptly of any amendment to the Registration Statement or supplement to the Prospectus and any stop order suspending the effectiveness of the Registration Statement.

5. Fees and Expenses.

(a) The Trust will, with respect to each Fund, pay to the Distributor all fees and expenses pursuant to the terms of the Rule 12b-1 Plan in effect for each respective Fund.

(b) The Distributor will bear the following costs and expenses relating to the distribution of Shares of the Funds: (a) the costs of maintaining the records required of a broker-dealer registered under the 1934 Act; (b) the expenses of maintaining its registration or qualification as a dealer or broker under federal or state laws; (c) the expenses incurred by the Distributor in connection with normal (non-expedited) NASD filing fees; and (d) all other expenses incurred in connection with the distribution services contemplated herein, except as specifically provided in this Agreement.

(c) The Distributor shall pay, from the fees received by it from the Funds pursuant to the Rule 12b-1 Plan, all fees and make reimbursement of expenses, pursuant to and in accordance with any and all Investor Services Agreements, as approved by the Board of Trustees of the Trust, as set forth in
Section 3 of this Agreement. Further, the Distributor will pay, from the fees received by it from the Funds pursuant to the Rule 12b-1 Plan, all fees with respect to expedited NASD filing fees.

6. Indemnification.

(a) The Trust agrees to indemnify and hold harmless the Distributor and each of the directors, officers, agents and employees and any person who controls the Distributor within the meaning of Section 15 of the 1933 Act (any of the Distributor, its officers, agents, employees and directors or such control persons, for purposes of this paragraph, an "Indemnitee") against any loss, liability, claim, damages or expense (including the reasonable cost of investigating or defending any alleged loss, liability, claim, damages or expense and reasonable counsel fees incurred in connection therewith) arising out of or based upon the claim that the Registration Statement, Prospectus, shareholder reports or other information filed or made public by the Trust (as from time to time amended) included an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary in order to make the statements therein (and in the case of the Prospectus, in light of the circumstances under which they were made) not misleading under the 1933 Act, or any other statute or the common law. However, the Trust does not agree to indemnify the Distributor or hold it harmless to the extent that the statement or omission was made in reliance upon, and in conformity with information furnished to the Trust by or on behalf of the Distributor. The Trust will also not indemnify any Indemnitee with respect to any untrue statement or omission made in the Registration Statement or Prospectus that is subsequently corrected in such document (or an amendment thereof or supplement thereto) if a copy of the Prospectus (or such amendment or supplement) was not sent or given to the person asserting any such loss, liability, claim, damage or expense at or before the written confirmation to such person in any case where such delivery is required by the 1933 Act and the Trust had notified the Distributor of the amendment or

4

supplement prior to the sending of the confirmation. In no case (i) is the indemnity of the Trust in favor of any Indemnitee to be deemed to protect the Indemnitee against any liability to the Trust or its shareholders to which the Indemnitee would otherwise be subject by reason of willful misfeasance, bad faith or gross negligence in the performance of its duties or by reason of its reckless disregard of its obligations and duties under this Agreement, or (ii) is the Trust to be liable under its indemnity agreement contained in this paragraph with respect to any claim made against any Indemnitee unless the Indemnitee shall have notified the Trust in writing of the claim within a reasonable time after the summons or other first written notification giving information of the nature of the claim shall have been served upon Indemnitee (or after Indemnitee shall have received notice of service on any designated agent). However, failure to notify the Trust of any claim shall not relieve the Trust from any liability which it may have to any Indemnitee against whom such action is brought otherwise than on account of its indemnity agreement contained in this paragraph. The Trust shall be entitled to participate at its own expense in the defense, or, if it so elects, to assume the defense of any suit brought to enforce any claims, but if the Trust elects to assume the defense, the defense shall be conducted by counsel chosen by it and satisfactory to Indemnitee, defendant or defendants in the suit. In the event the Trust elects to assume the defense of any suit and retain counsel, Indemnitee, defendant or defendants in the suit, shall bear the fees and expenses of any additional counsel retained by them. If the Trust does not elect to assume the defense of any suit, it will reimburse the Indemnitee, defendant or defendants in the suit, for the reasonable fees and expenses of any counsel retained by them. The Trust agrees to notify the Distributor and any Indemnified Dealer promptly of the commencement of any litigation or proceedings against it or any of its officers or trustees in connection with the issuance or sale of any of the Shares.

(b) The Distributor agrees to indemnify and hold harmless the Trust and each of its Trustees and officers and any person who controls the Trust within the meaning of Section 15 of the 1933 Act (for purposes of this paragraph, the Trust and each of its Trustees and officers and its controlling persons are collectively referred to as the "Trust Affiliates") against any loss, liability, claim, damages or expense (including the reasonable cost of investigating or defending any alleged loss, liability, claim, damages or expense and reasonable counsel fees incurred in connection therewith) which the Trust Affiliate may incur under the 1933 Act or any other statute or common law, but only to the extent that such loss, liability, claim, damages or expense shall arise out of or be based upon (i) the allegation of any wrongful act of the Distributor or any of its employees or (ii) allegation that the Registration Statement, Prospectus, shareholder reports or other information filed or made public by the Trust (as from time to time amended) included an untrue statement of a material fact or omitted to state a material fact required to be stated or necessary in order to make the statements not misleading, insofar as the statement or omission was made in reliance upon, and in conformity with information furnished to the Trust by or on behalf of the Distributor. In no case (i) is the indemnity of the Distributor in favor of any Trust Affiliate to be deemed to protect any Trust Affiliate against any liability to the Trust or its security holders to which such Trust Affiliate would otherwise be subject by reason of willful misfeasance, bad faith or gross negligence in the performance of its duties or by reason of its reckless disregard of its obligations and duties under this Agreement, or (ii) is the Distributor to be liable under its indemnity agreement contained in this paragraph with respect to any claim made against any Trust Affiliate unless the Trust Affiliate shall have notified the Distributor in writing of the claim within a reasonable time after the summons or the first written notification giving information of the nature of the claim shall have been served upon the Trust Affiliate (or after the Trust Affiliate shall have received notice of service on any designated agent). However, failure to notify the Distributor of any claim shall not relieve the Distributor from any liability which it may have to the Trust Affiliate against whom the action is brought otherwise than on account of its indemnity agreement contained in this paragraph. The Distributor shall be entitled to participate at its own expense in the defense or, if it so elects, to assume the defense of any suit brought to enforce the claim, but if the Distributor elects to assume the defense, the defense shall be conducted by counsel

5

chosen by it and satisfactory to the Trust, its officers and Board and to any controlling person or persons, defendant or defendants in the suit. In the event that Distributor elects to assume the defense of any suit and retain counsel, the Trust or controlling person or persons, defendant or defendants in the suit, shall bear the fees and expenses of any additional counsel retained by them. If the Distributor does not elect to assume the defense of any suit, it will reimburse the Trust, its officers and Board or controlling person or persons, defendant or defendants in the suit, for the reasonable fees and expenses of any counsel retained by them. The Distributor agrees to notify the Trust promptly of the commencement of any litigation or proceedings against it in connection with the issuance and sale of any of the shares.

(c) No indemnified party shall settle any claim against it for which it intends to seek indemnification from the indemnifying party, under the terms of section 6(a) or 6(b) above, without the prior written notice to and consent from the indemnifying party, which consent shall not be unreasonably withheld. No indemnified or indemnifying party shall settle any claim unless the settlement contains a full release of liability with respect to the other party in respect of such action. This section 6 shall survive the termination of this Agreement.

7. Representations.

(a) The Distributor represents and warrants that (i) it is duly organized as a Colorado corporation and is and at all times will remain duly authorized and licensed to carry out its services as contemplated herein; (ii) the execution, delivery and performance of this Agreement are within its power and have been duly authorized by all necessary action; and (iii) its entering into this Agreement or providing the services contemplated hereby does not conflict with or constitute a default or require a consent under or breach of any provision of any agreement or document to which the Distributor is a party or by which it is bound and (iv) it is registered as a broker-dealer under the 1934 Act and is a member of the NASD.

(b) The Trust represents and warrants that (i) it is duly organized as a Massachusetts trust and is and at all times will remain duly authorized to carry out its obligations as contemplated herein; (ii) it is registered as an investment company under the 1940 Act; (iii) the execution, delivery and performance of this Agreement are within its power and have been duly authorized by all necessary action; and (iv) its entering into this Agreement does not conflict with or constitute a default or require a consent under or breach of any provision of any agreement or document to which the Trust is a party or by which it is bound.

8. Duration, Termination and Amendment.

(a) This Agreement shall be effective on March 1, 2000, and unless terminated as provided herein, shall continue for two years from its effective date, and thereafter from year to year, provided such continuance is approved annually by the vote of a majority of the Board of Trustees, and by the vote of those Trustees who are not "interested persons" of the Trust (the "Independent Trustees") and, if a plan under Rule 12b-1 under the 1940 Act is in effect, by the vote of those Trustees who are not "interested persons" of the Trust and who are not parties to such plan or this Agreement and have no financial interest in the operation of such plan or in any agreements related to such plan, cast in person at a meeting called for the purpose of voting on the approval. This Agreement may be terminated at any time, without the payment of any penalty, as to each Fund (i) by vote of a majority of the Independent Trustees or (ii) by vote of a majority (as defined in the 1940 Act) of the outstanding voting securities of the Fund, on at least sixty (60) days prior written notice to the Distributor. In addition, this Agreement may be terminated at any time by the Distributor upon at least sixty (60) days prior written notice to the Trust.

6

This Agreement shall automatically terminate in the event of its assignment. As used in this paragraph, the terms "assignment" and "interested persons" shall have the respective meanings specified in the 1940 Act.

(b) During such period as the Distributor receives compensation pursuant to the 12b-1 Plan, and this Agreement constitutes a Rule 12b-1 Plan related agreement, (i) any material amendment to this Agreement requires the approval provided for in paragraph (a) with respect to annual renewals of this Agreement, and (ii) any amendment that materially increases the amount to be spent for distribution services requires the additional approval of the majority of the Trust's outstanding voting securities (as defined in the 1940 Act) of each affected Fund; and (iii) the selection and nomination of those Trustees who are not "interested persons" (as defined in the 1940 Act) of the Trust shall be committed to the discretion of the Trustees of the Trust who are not such "interested persons" of the Trust;

(c) No provision of this Agreement may be changed, waived, discharged or terminated except by an instrument in writing signed by the party against which an enforcement of the change, waiver, discharge or termination is sought.

9. Notice. Any notice or other communication authorized or required by this Agreement to be given to either party shall be in writing and deemed to have been given when delivered in person or by confirmed facsimile, or posted by certified mail, return receipt requested, to the following address (or such other address as a party may specify by written notice to the other): if to the Distributor: ALPS Mutual Funds Services, Inc., 370 17th Street, Suite 3100, Denver, CO 80202, Attn.: General Counsel, fax: (303) 623-7850; if to the Trust:
State Street Bank and Trust Company, Attn.: Fund Administration Legal Department, P.O. Box 1713, Boston, MA 02105-1713 fax: (617) 662-3805.

10. Limitation of Liability. The Distributor is expressly put on notice of the limitation of shareholder liability as set forth in the Declaration of Trust of the Trust and agrees that the obligations assumed by the Trust under this contract shall be limited in all cases to the Trust and its assets. The Distributor shall not seek satisfaction of any such obligation from the shareholders or any shareholder of the Trust, nor shall the Distributor seek satisfaction of any such obligation from the Trustees or any individual Trustee of the Trust. The Distributor understands that the rights and obligations of each series of shares of the Trust under the Declaration of Trust are separate and distinct from those of any and all other series.

11. Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws of The Commonwealth of Massachusetts, without giving effect to the choice of laws provisions thereof.

12. Counterparties. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

13. Severability. If any provisions of this Agreement shall be held or made invalid, in whole or in part, then the other provisions of this Agreement shall remain in force. Invalid provisions shall, in accordance with this Agreement's intent and purpose, be amended, to the extent legally possible, by valid provisions in order to effectuate the intended results of the invalid provisions.

14. Insurance. The Distributor will maintain at its expense an errors and omissions insurance policy that covers services by the Distributor hereunder.

7

15. Segregation of Fees and Expenses. Amounts paid by each Fund to the Distributor under its Rule 12b-1 Plan either for distribution related services or shareholder services shall not be used to pay for the distribution of Shares of, or shareholder servicing in respect of, any other Fund. However, fees under the Rule 12b-1 Plan attributable to the Trust as a whole shall be allocated to each Fund according to the method adopted by the Trust's Board of Trustees. Fees attributable to the Trust as a whole shall include any amounts payable under the Rule 12b-1 Plan to the Distributor for its services rendered hereunder. The Distributor's allocation of such Rule 12b-1 Plan fees shall be subject to review by the Trust's Board of Trustees.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their officers designated below as of the date first set forth above.

THE STATE STREET INSTITUTIONAL INVESTMENT TRUST

By:/s/Kathleen C. Cuocolo
   ----------------------
Name: Kathleen C. Cuocolo
Title: President

ALPS MUTUAL FUNDS SERVICES, INC.

By: /s/Thomas C. Carter
   --------------------
Name:  Thomas C. Carter
Title: Chief Financial Officer

8

Annex I

FUND

State Street Equity 500 Index Fund (classes A and B) State Street Equity 400 Index Fund State Street Equity 2000 Index Fund State Street MSCI(R) EAFE(R) Index Fund State Street Aggregate Bond Index Fund

As of February 28, 2000

9

EXHIBIT 99.(e)(2)

ADDENDUM TO DISTRIBUTION AGREEMENT DATED
FEBRUARY 28, 2000
BETWEEN
ALPS MUTUAL FUNDS SERVICES, INC.
AND
THE STATE STREET INSTITUTIONAL INVESTMENT TRUST

THIS ADDENDUM is made as of March 30, 2001 by and between ALPS Mutual Funds Services, Inc. ("ALPS"), and the State Street Institutional Investment Trust (the "Trust").

WHEREAS, ALPS and the Trust have entered into a Distribution Agreement (the "Agreement") dated February 28, 2000;

WHEREAS, Effective April 2, 2001, ALPS, as distributor, will change its name to ALPS Distributors, Inc.

WHEREAS, in light of the foregoing, ALPS and the Trust wish to modify the provisions of the Agreement to reflect the change in the name of ALPS to ALPS Distributors, Inc.

NOW, THEREFORE, the parties hereto, intending to be legally bound, agree as follows:

1. ALPS DISTRIBUTORS, INC. All references to ALPS Mutual Funds Services, Inc. within the Agreement shall be replaced with references to ALPS Distributors, Inc.

2. REMAINDER OF THE AGREEMENT. All other provisions of the Agreement shall remain unchanged.

IN WITNESS WHEREOF, this Addendum has been executed by a duly authorized representative of each of the parties hereto as of the date of the Addendum first set forth above.

ALPS Mutual Funds Services, Inc.     State Street Institutional Investment Trust


By:/s/Jeremy O. May                  By:/s/Kathleen C. Cuocolo
   ----------------                     ----------------------
Name: Jeremy O. May                  Name: Kathleen C. Cuocolo
Title: Vice President                Title: President


EXHIBIT 99.(e)(3)

ALPS Distributors, Inc.
370 Seventeenth Street
Denver, Colorado 80202-5627

Ladies and Gentlemen:

Reference is made to the Distribution Agreement between us dated February 28, 2000, as amended on March 31, 2001 (the "Agreement").

Pursuant to the Agreement, this letter is to provide notice of the creation of two additional funds of the State Street Institutional Investment Trust (the "Trust"), namely the State Street Money Market Fund and the State Street U.S. Government Money Market Fund (the "New Funds").

We request that you act as Distributor under the Agreement with respect to the New Funds.

Please indicate your acceptance of the foregoing by executing two copies of this letter, returning one copy to the Trust and retaining one copy for your records.

Very truly yours,

State Street Institutional Investment Trust

By:

Accepted:

ALPS Distributors, Inc.

By:

Date: February 14, 2002


Exhibit 99.(g)(1)

AMENDED AND RESTATED CUSTODIAN AGREEMENT

This Agreement between State Street Institutional Investment Trust, a business trust organized and existing under the laws of the Commonwealth of Massachusetts, having its principal place of business at 225 Franklin Street, Boston, Massachusetts, 02110, hereinafter called the "Fund", and State Street Bank and Trust Company, a Massachusetts trust company, having its principal place of business at 225 Franklin Street, Boston, Massachusetts, 02110, hereinafter called the "Custodian",

WITNESSETH:

WHEREAS, the Fund is registered as an open-end management investment company under the Investment Company Act of 1940, as amended (the "1940 Act"); and

WHEREAS, the Fund is authorized to issue shares in separate series, with each such series representing interests in a separate portfolio of securities and other assets; and

WHEREAS, the Fund intends to initially offer shares (the "Shares") in five (5) series, State Street Equity 500 Index Fund, State Street Equity 2000 Index Fund, State Street Equity 400 Index Fund, State Street MSCI(R) EAFE(R) Index Fund and State Street Aggregate Bond Index Fund (such series together with all other series subsequently established by the Fund and made subject to this Agreement in accordance with Section 18, being herein referred to as the "Portfolio(s)");

WHEREAS, the parties hereto are contemporaneously entering into an Administration Agreement, dated the date hereof (the "Administration Agreement"), pursuant to which the Fund will delegate to State Street Bank and Trust Company certain responsibilities;

SECTION 1. EMPLOYMENT OF CUSTODIAN AND PROPERTY TO BE HELD BY IT

The Fund hereby employs the Custodian as the custodian of the assets of the Portfolios of the Fund, including securities which the Fund, on behalf of the applicable Portfolio, desires to be held in places within the United States ("DOMESTIC SECURITIES") and securities it desires to be held outside the United States ("FOREIGN SECURITIES"). The Fund, on behalf of the Portfolio(s), agrees to deliver to the Custodian all securities and cash of the Portfolios, and all payments of income, payments of principal or capital distributions received by it with respect to all securities owned by the Portfolio(s) from time to time, and the cash consideration received by it for such new or


treasury shares of beneficial interest of the Fund representing interests in the Portfolios ("SHARES") as may be issued or sold from time to time. The Custodian shall not be responsible for any property of a Portfolio held or received by the Portfolio and not delivered to the Custodian. With respect to uncertificated shares or other units of beneficial interest (the "UNDERLYING SHARES") of "investment companies" (as defined in Section 3(a)(1) of the Investment Company Act of 1940, as amended (the "1940 ACT"), whether in the same "group of investment companies" (as defined in Section 12(d)(1)(G)(ii) of the 1940 Act) or otherwise, including, pursuant to Section 12(d)(1)(F) of the 1940 Act (hereinafter sometimes referred to as the "UNDERLYING PORTFOLIOS"), the holding of confirmation statements that identify the shares as being recorded in the Custodian's name on behalf of the Portfolios will be deemed custody for purposes hereof.

Upon receipt of "PROPER INSTRUCTIONS" (as such term is defined in Section 6 hereof), the Custodian shall on behalf of the applicable Portfolio(s) from time to time employ one or more sub-custodians located in the United States, but only in accordance with an applicable vote by the Board of Trustees of the Fund (the "BOARD") on behalf of the applicable Portfolio(s). The Custodian may employ as sub-custodian for the Fund's foreign securities on behalf of the applicable Portfolio(s) the foreign banking institutions and foreign securities depositories designated in Schedules A and B hereto, but only in accordance with the applicable provisions of Sections 3 and 4. The Custodian shall have no more or less responsibility or liability to the Fund on account of any actions or omissions of any sub-custodian so employed than any such sub-custodian has to the Custodian.

SECTION 2. DUTIES OF THE CUSTODIAN WITH RESPECT TO PROPERTY OF THE FUND HELD BY THE CUSTODIAN IN THE UNITED STATES

SECTION 2.1 HOLDING SECURITIES. The Custodian shall hold and physically segregate for the account of each Portfolio all non-cash property, to be held by it in the United States, including all domestic securities owned by such Portfolio other than (a) securities which are maintained pursuant to Section 2.8 in a clearing agency which acts as a securities depository or in a book-entry system authorized by the U.S. Department of the Treasury (each, a "U.S. SECURITIES SYSTEM") and (b) the Underlying Shares owned by the Fund which are maintained pursuant to Section 2.10 in an account with State Street Bank and Trust Company or such other entity which may from time to time act as a transfer agent for the Underlying Portfolios and with respect to which the Custodian is provided with Proper Instructions (the "UNDERLYING TRANSFER AGENT").

SECTION 2.2 DELIVERY OF SECURITIES. The Custodian shall release and deliver domestic securities owned by a Portfolio held by the Custodian or in a U.S. Securities System account of the Custodian or in an account at the Underlying Transfer Agent only upon receipt of Proper Instructions on behalf of the applicable Portfolio, which may be continuing instructions when deemed appropriate by the parties, and only in the following cases:


1) Upon sale of such securities for the account of the Portfolio and receipt of payment therefor;

2) Upon the receipt of payment in connection with any repurchase agreement related to such securities entered into by the Portfolio;

3) In the case of a sale effected through a U.S. Securities System, in accordance with the provisions of Section 2.8 hereof;

4) To the depository agent in connection with tender or other similar offers for securities of the Portfolio;

5) To the issuer thereof or its agent when such securities are called, redeemed, retired or otherwise become payable; provided that, in any such case, the cash or other consideration is to be delivered to the Custodian;

6) To the issuer thereof, or its agent, for transfer into the name of the Portfolio or into the name of any nominee or nominees of the Custodian or into the name or nominee name of any agent appointed pursuant to Section 2.7 or into the name or nominee name of any sub-custodian appointed pursuant to
Section 1; or for exchange for a different number of bonds, certificates or other evidence representing the same aggregate face amount or number of units; provided that, in any such case, the new securities are to be delivered to the Custodian;

7) Upon the sale of such securities for the account of the Portfolio, to the broker or its clearing agent, against a receipt, for examination in accordance with "street delivery" custom; provided that in any such case, the Custodian shall have no responsibility or liability for any loss arising from the delivery of such securities prior to receiving payment for such securities except as may arise from the Custodian's own negligence or willful misconduct;

8) For exchange or conversion pursuant to any plan of merger, consolidation, recapitalization, reorganization or readjustment of the securities of the issuer of such securities, or pursuant to provisions for conversion contained in such securities, or pursuant to any deposit agreement; provided that, in any such case, the new securities and cash, if any, are to be delivered to the Custodian;

9) In the case of warrants, rights or similar securities, the surrender thereof in the exercise of such warrants, rights or similar securities or the surrender of interim receipts or temporary securities for definitive securities; provided that, in any such case, the new securities and cash, if any, are to be delivered to the Custodian;

3

10) For delivery in connection with any loans of securities made by the Portfolio, but only against receipt of adequate collateral as agreed upon from time to time by the Custodian and the Fund on behalf of the Portfolio, which may be in the form of cash or obligations issued by the United States government, its agencies or instrumentalities, except that in connection with any loans for which collateral is to be credited to the Custodian's account in the book-entry system authorized by the U.S. Department of the Treasury, the Custodian will not be held liable or responsible for the delivery of securities owned by the Portfolio prior to the receipt of such collateral;

11) For delivery as security in connection with any borrowing by the Fund on behalf of the Portfolio requiring a pledge of assets by the Fund on behalf of the Portfolio, but only against receipt of amounts borrowed;

12) For delivery in accordance with the provisions of any agreement among the Fund on behalf of the Portfolio, the Custodian and a broker-dealer registered under the Securities Exchange Act of 1934 (the "EXCHANGE ACT") and a member of The National Association of Securities Dealers, Inc. ("NASD"), relating to compliance with the rules of The Options Clearing Corporation and of any registered national securities exchange, or of any similar organization or organizations, regarding escrow or other arrangements in connection with transactions by the Portfolio of the Fund;

13) For delivery in accordance with the provisions of any agreement among the Fund on behalf of the Portfolio, the Custodian, and a futures commission merchant registered under the Commodity Exchange Act, relating to compliance with the rules of the Commodity Futures Trading Commission ("CFTC") and/or any contract market, or any similar organization or organizations, regarding account deposits in connection with transactions by the Portfolio of the Fund;

14) Upon receipt of instructions from the transfer agent for the Fund (the "TRANSFER AGENT") for delivery to such Transfer Agent or to the holders of Shares in connection with distributions in kind, as may be described from time to time in the currently effective prospectus and statement of additional information of the Fund related to the Portfolio (the "PROSPECTUS"), in satisfaction of requests by holders of Shares for repurchase or redemption;

15) In the case of a sale processed through the Underlying Transfer Agent of Underlying Shares, in accordance with
Section 2.10 hereof; and

16) For any other purpose, but only upon receipt of Proper Instructions from the Fund on behalf of the applicable Portfolio specifying the securities of the Portfolio to be delivered and naming the person or persons to whom delivery of such securities shall be made.

4

SECTION 2.3 REGISTRATION OF SECURITIES. Domestic securities held by the Custodian (other than bearer securities) shall be registered in the name of the Portfolio or in the name of any nominee of the Fund on behalf of the Portfolio or of any nominee of the Custodian which nominee shall be assigned exclusively to the Portfolio, unless the Fund has authorized in writing the appointment of a nominee to be used in common with other registered investment companies having the same investment advisor as the Portfolio, or in the name or nominee name of any agent appointed pursuant to Section 2.7 or in the name or nominee name of any sub-custodian appointed pursuant to Section 1. All securities accepted by the Custodian on behalf of the Portfolio under the terms of this Agreement shall be in "street name" or other good delivery form. If, however, the Fund directs the Custodian to maintain securities in "street name", the Custodian shall utilize its best efforts only to timely collect income due the Fund on such securities and to notify the Fund on a best efforts basis only of relevant corporate actions including, without limitation, pendency of calls, maturities, tender or exchange offers.

SECTION 2.4 BANK ACCOUNTS. The Custodian shall open and maintain a separate bank account or accounts in the United States in the name of each Portfolio of the Fund, subject only to draft or order by the Custodian acting pursuant to the terms of this Agreement, and shall hold in such account or accounts, subject to the provisions hereof, all cash received by it from or for the account of the Portfolio, other than cash maintained by the Portfolio in a bank account established and used in accordance with Rule 17f-3 under the Investment Company Act of 1940, as amended (the "1940 ACT"). Funds held by the Custodian for a Portfolio may be deposited by it to its credit as Custodian in the banking department of the Custodian or in such other banks or trust companies as it may in its discretion deem necessary or desirable; provided, however, that every such bank or trust company shall be qualified to act as a custodian under the 1940 Act and that each such bank or trust company and the funds to be deposited with each such bank or trust company shall on behalf of each applicable Portfolio be approved by vote of a majority of the Board. Such funds shall be deposited by the Custodian in its capacity as Custodian and shall be withdrawable by the Custodian only in that capacity.

SECTION 2.5 COLLECTION OF INCOME. Subject to the provisions of Section 2.3, the Custodian shall collect on a timely basis all income and other payments with respect to registered domestic securities held hereunder to which each Portfolio shall be entitled either by law or pursuant to custom in the securities business, and shall collect on a timely basis all income and other payments with respect to bearer domestic securities if, on the date of payment by the issuer, such securities are held by the Custodian or its agent thereof and shall credit such income, as collected, to such Portfolio's custodian account. Without limiting the generality of the foregoing, the Custodian shall detach and present for payment all coupons and other income items requiring presentation as and when they become due and shall collect interest when due on securities held hereunder. Income due each Portfolio on securities loaned pursuant to the provisions of Section 2.2 (10) shall be the responsibility of the Fund. The Custodian will have no duty or responsibility in connection therewith, other than to provide the Fund with such

5

information or data as may be necessary to assist the Fund in arranging for the timely delivery to the Custodian of the income to which the Portfolio is properly entitled.

SECTION 2.6 PAYMENT OF FUND MONIES. Upon receipt of Proper Instructions on behalf of the applicable Portfolio, which may be continuing instructions when deemed appropriate by the parties, the Custodian shall pay out monies of a Portfolio in the following cases only:

1) Upon the purchase of domestic securities, options, futures contracts or options on futures contracts for the account of the Portfolio but only (a) against the delivery of such securities or evidence of title to such options, futures contracts or options on futures contracts to the Custodian (or any bank, banking firm or trust company doing business in the United States or abroad which is qualified under the 1940 Act to act as a custodian and has been designated by the Custodian as its agent for this purpose) registered in the name of the Portfolio or in the name of a nominee of the Custodian referred to in Section 2.3 hereof or in proper form for transfer; (b) in the case of a purchase effected through a U.S. Securities System, in accordance with the conditions set forth in Section 2.8 hereof; (c) in the case of a purchase of Underlying Shares, in accordance with the conditions set forth in Section 2.10 hereof; (d) in the case of repurchase agreements entered into between the Fund on behalf of the Portfolio and the Custodian, or another bank, or a broker-dealer which is a member of NASD, (i) against delivery of the securities either in certificate form or through an entry crediting the Custodian's account at the Federal Reserve Bank with such securities or (ii) against delivery of the receipt evidencing purchase by the Portfolio of securities owned by the Custodian along with written evidence of the agreement by the Custodian to repurchase such securities from the Portfolio; or (e) for transfer to a time deposit account of the Fund in any bank, whether domestic or foreign; such transfer may be effected prior to receipt of a confirmation from a broker and/or the applicable bank pursuant to Proper Instructions from the Fund as defined herein;

2) In connection with conversion, exchange or surrender of securities owned by the Portfolio as set forth in Section 2.2 hereof;

3) For the redemption or repurchase of Shares issued as set forth in Section 5 hereof;

4) For the payment of any expense or liability incurred by the Portfolio, including but not limited to the following payments for the account of the Portfolio: interest, taxes, management, accounting, transfer agent and legal fees, and operating expenses of the Fund whether or not such expenses are to be in whole or part capitalized or treated as deferred expenses;

5) For the payment of any dividends on Shares declared pursuant to the governing documents of the Fund;

6

6) For payment of the amount of dividends received in respect of securities sold short; and

7) For any other purpose, but only upon receipt of Proper Instructions from the Fund on behalf of the Portfolio specifying the amount of such payment and naming the person or persons to whom such payment is to be made.

SECTION 2.7 APPOINTMENT OF AGENTS. The Custodian may at any time or times in its discretion appoint (and may at any time remove) any other bank or trust company which is itself qualified under the 1940 Act to act as a custodian, as its agent to carry out such of the provisions of this Section 2 as the Custodian may from time to time direct; provided, however, that the appointment of any agent shall not relieve the Custodian of its responsibilities or liabilities hereunder. The Underlying Transfer Agent shall not be deemed an agent or subcustodian of the Custodian for purposes of this Section 2.7 or any other provision of this Agreement.

SECTION 2.8 DEPOSIT OF FUND ASSETS IN U.S. SECURITIES SYSTEMS. The Custodian may deposit and/or maintain securities owned by a Portfolio in a U.S. Securities System subject to the following provisions:

1) The Custodian may keep securities of the Portfolio in a U.S. Securities System provided that such securities are represented in an account of the Custodian in the U.S. Securities System (the "U.S. SECURITIES SYSTEM ACCOUNT") which account shall not include any assets of the Custodian other than assets held as a fiduciary, custodian or otherwise for customers;

2) The records of the Custodian with respect to securities of the Portfolio which are maintained in a U.S. Securities System shall identify by book-entry those securities belonging to the Portfolio;

3) The Custodian shall pay for securities purchased for the account of the Portfolio upon (i) receipt of advice from the U.S. Securities System that such securities have been transferred to the U.S. Securities System Account, and (ii) the making of an entry on the records of the Custodian to reflect such payment and transfer for the account of the Portfolio. The Custodian shall transfer securities sold for the account of the Portfolio upon (i) receipt of advice from the U.S. Securities System that payment for such securities has been transferred to the U.S. Securities System Account, and (ii) the making of an entry on the records of the Custodian to reflect such transfer and payment for the account of the Portfolio. Copies of all advices from the U.S. Securities System of transfers of securities for the account of the Portfolio shall identify the Portfolio, be maintained for the Portfolio by the Custodian and be provided to the Fund at its request. Upon request, the Custodian shall furnish the Fund on behalf of the Portfolio confirmation of each transfer to or from the account of the Portfolio in the form of a written advice or notice and

7

shall furnish to the Fund on behalf of the Portfolio copies of daily transaction sheets reflecting each day's transactions in the U.S. Securities System for the account of the Portfolio;

4) The Custodian shall provide the Fund with any report obtained by the Custodian on the U.S. Securities System's accounting system, internal accounting control and procedures for safeguarding securities deposited in the U.S. Securities System;

5) Anything to the contrary in this Agreement notwithstanding, the Custodian shall be liable to the Fund for the benefit of the Portfolio for any loss or damage to the Portfolio resulting from use of the U.S. Securities System by reason of any negligence, misfeasance or misconduct of the Custodian or any of its agents or of any of its or their employees or from failure of the Custodian or any such agent to enforce effectively such rights as it may have against the U.S. Securities System; at the election of the Fund, it shall be entitled to be subrogated to the rights of the Custodian with respect to any claim against the U.S. Securities System or any other person which the Custodian may have as a consequence of any such loss or damage if and to the extent that the Portfolio has not been made whole for any such loss or damage.

SECTION 2.9 SEGREGATED ACCOUNT. The Custodian shall upon receipt of Proper Instructions on behalf of each applicable Portfolio establish and maintain a segregated account or accounts for and on behalf of each such Portfolio, into which account or accounts may be transferred cash and/or securities, including securities maintained in an account by the Custodian pursuant to Section 2.8 hereof, (i) in accordance with the provisions of any agreement among the Fund on behalf of the Portfolio, the Custodian and a broker-dealer registered under the Exchange Act and a member of the NASD (or any futures commission merchant registered under the Commodity Exchange Act), relating to compliance with the rules of The Options Clearing Corporation and of any registered national securities exchange (or the CFTC or any registered contract market), or of any similar organization or organizations, regarding escrow or other arrangements in connection with transactions by the Portfolio,
(ii) for purposes of segregating cash or government securities in connection with options purchased, sold or written by the Portfolio or commodity futures contracts or options thereon purchased or sold by the Portfolio, (iii) for the purposes of compliance by the Portfolio with the procedures required by Investment Company Act Release No. 10666, or any subsequent release of the U.S. Securities and Exchange Commission (the "SEC"), or interpretative opinion of the staff of the SEC, relating to the maintenance of segregated accounts by registered investment companies, and (iv) for any other purpose upon receipt of Proper Instructions from the Fund on behalf of the applicable Portfolio.

SECTION 2.10 DEPOSIT OF FUND ASSETS WITH THE UNDERLYING TRANSFER AGENT. Underlying Shares shall be deposited and/or maintained in an account or accounts maintained with the Underlying Transfer Agent. The Underlying Transfer Agent shall be deemed to be acting as if it is a "securities depository" for purposes of Rule 17f-4 under the 1940 Act. The Fund hereby directs

8

the Custodian to deposit and/or maintain such securities with the Underlying Transfer Agent, subject to the following provisions:

1) The Custodian shall keep Underlying Shares owned by a Portfolio with the Underlying Transfer Agent provided that such securities are maintained in an account or accounts on the books and records of the Underlying Transfer Agent in the name of the Custodian as custodian for the Portfolio.

2) The records of the Custodian with respect to Underlying Shares that are maintained with the Underlying Transfer Agent shall identify by book-entry those Underlying Shares belonging to each Portfolio;

3) The Custodian shall pay for Underlying Shares purchased for the account of a Portfolio upon (i) receipt of advice from the Portfolio's investment adviser that such Underlying Shares have been purchased and will be transferred to the account of the Custodian, on behalf of the Portfolio, on the books and records of the Underlying Transfer Agent, and (ii) the making of an entry on the records of the Custodian to reflect such payment and transfer for the account of the Portfolio. The Custodian shall receive confirmation from the Underlying Transfer Agent of the purchase of such securities and the transfer of such securities to the Custodian's account with the Underlying Transfer Agent only after such payment is made. The Custodian shall transfer Underlying Shares redeemed for the account of a Portfolio (i) upon receipt of an advice from the Portfolio's investment adviser that such securities have been redeemed and that payment for such securities will be transferred to the Custodian and (ii) the making of an entry on the records of the Custodian to reflect such transfer and payment for the account of the Portfolio. The Custodian will receive confirmation from the Underlying Transfer Agent of the redemption of such securities and payment therefor only after such securities are redeemed. Copies of all advices from the Portfolio's investment adviser of purchases and sales of Underlying Shares for the account of the Portfolio shall identify the Portfolio, be maintained for the Portfolio by the Custodian, and be provided to the investment adviser at its request;

4) The Custodian shall be not be liable to the Fund or any Portfolio for any loss or damage to the Fund or any Portfolio resulting from maintenance of Underlying Shares with Underlying Transfer Agent except for losses resulting directly from the negligence, misfeasance or misconduct of the Custodian or any of its agents or of any of its or their employees.

SECTION 2.11 OWNERSHIP CERTIFICATES FOR TAX PURPOSES. The Custodian shall execute ownership and other certificates and affidavits for all federal and state tax purposes in connection with receipt of income or other payments with respect to domestic securities of each Portfolio held by it and in connection with transfers of securities.

9

SECTION 2.12 PROXIES. The Custodian shall, with respect to the domestic securities held hereunder, cause to be promptly executed by the registered holder of such securities, if the securities are registered otherwise than in the name of the Portfolio or a nominee of the Portfolio, all proxies, without indication of the manner in which such proxies are to be voted, and shall promptly deliver to the Portfolio such proxies, all proxy soliciting materials and all notices relating to such securities.

SECTION 2.13 COMMUNICATIONS RELATING TO PORTFOLIO SECURITIES. Subject to the provisions of Section 2.3, the Custodian shall transmit promptly to the Fund for each Portfolio all written information (including, without limitation, pendency of calls and maturities of domestic securities and expirations of rights in connection therewith and notices of exercise of call and put options written by the Fund on behalf of the Portfolio and the maturity of futures contracts purchased or sold by the Portfolio) received by the Custodian from issuers of the securities being held for the Portfolio. With respect to tender or exchange offers, the Custodian shall transmit promptly to the Portfolio all written information received by the Custodian from issuers of the securities whose tender or exchange is sought and from the party (or its agents) making the tender or exchange offer. If the Portfolio desires to take action with respect to any tender offer, exchange offer or any other similar transaction, the Portfolio shall notify the Custodian at least three business days prior to the date on which the Custodian is to take such action.

SECTION 3. PROVISIONS RELATING TO RULES 17F-5 AND 17F-7

SECTION 3.1. DEFINITIONS. As used throughout this Agreement, the capitalized terms set forth below shall have the indicated meanings:

"Country Risk" means all factors reasonably related to the systemic risk of holding Foreign Assets in a particular country including, but not limited to, such country's political environment, economic and financial infrastructure (including any Eligible Securities Depository operating in the country), prevailing or developing custody and settlement practices, and laws and regulations applicable to the safekeeping and recovery of Foreign Assets held in custody in that country.

"Eligible Foreign Custodian" has the meaning set forth in section (a)(1) of Rule 17f-5, including a majority-owned or indirect subsidiary of a U.S. Bank (as defined in Rule 17f-5), a bank holding company meeting the requirements of an Eligible Foreign Custodian (as set forth in Rule 17f-5 or by other appropriate action of the SEC, or a foreign branch of a Bank (as defined in Section 2(a)(5) of the 1940 Act) meeting the requirements of a custodian under Section 17(f) of the 1940 Act; the term does not include any Eligible Securities Depository.

"Eligible Securities Depository" has the meaning set forth in section (b)(1) of Rule 17f-7.

10

"Foreign Assets" means any of the Portfolios' investments (including foreign currencies) for which the primary market is outside the United States and such cash and cash equivalents as are reasonably necessary to effect the Portfolios' transactions in such investments.

"Foreign Custody Manager" has the meaning set forth in section (a)(3) of Rule 17f-5.

"Rule 17f-5" means Rule 17f-5 promulgated under the 1940 Act.

"Rule 17f-7" means Rule 17f-7 promulgated under the 1940 Act.

SECTION 3.2. THE CUSTODIAN AS FOREIGN CUSTODY MANAGER.

3.2.1 DELEGATION TO THE CUSTODIAN AS FOREIGN CUSTODY MANAGER. The Fund, by resolution adopted by its Board, hereby delegates to the Custodian, subject to Section (b) of Rule 17f-5, the responsibilities set forth in this
Section 3.2 with respect to Foreign Assets of the Portfolios held outside the United States, and the Custodian hereby accepts such delegation as Foreign Custody Manager with respect to the Portfolios.

3.2.2 COUNTRIES COVERED. The Foreign Custody Manager shall be responsible for performing the delegated responsibilities defined below only with respect to the countries and custody arrangements for each such country listed on Schedule A to this Contract, which list of countries may be amended from time to time by the Fund with the agreement of the Foreign Custody Manager. The Foreign Custody Manager shall list on Schedule A the Eligible Foreign Custodians selected by the Foreign Custody Manager to maintain the assets of the Portfolios, which list of Eligible Foreign Custodians may be amended from time to time in the sole discretion of the Foreign Custody Manager. The Foreign Custody Manager will provide amended versions of Schedule A in accordance with
Section 3.2.5 hereof.

Upon the receipt by the Foreign Custody Manager of Proper Instructions to open an account or to place or maintain Foreign Assets in a country listed on Schedule A, and the fulfillment by the Fund, on behalf of the Portfolios, of the applicable account opening requirements for such country, the Foreign Custody Manager shall be deemed to have been delegated by the Board on behalf of the Portfolios responsibility as Foreign Custody Manager with respect to that country and to have accepted such delegation. Execution of this Agreement by the Fund shall be deemed to be a Proper Instruction to open an account, or to place or maintain Foreign Assets, in each country listed on Schedule A in which the Custodian has previously placed or currently maintains Foreign Assets pursuant to the terms of the Contract. Following the receipt of Proper Instructions directing the Foreign Custody Manager to close the account of a Portfolio with the Eligible Foreign Custodian selected by the Foreign Custody Manager in a designated country, the delegation by the Board on behalf of the Portfolios to the Custodian as Foreign Custody Manager for that country shall be deemed to have been withdrawn and the Custodian shall immediately cease to be the Foreign Custody Manager of the Portfolios with respect to that country.

11

The Foreign Custody Manager may withdraw its acceptance of delegated responsibilities with respect to a designated country upon written notice to the Fund. Thirty days (or such longer period to which the parties agree in writing) after receipt of any such notice by the Fund, the Custodian shall have no further responsibility in its capacity as Foreign Custody Manager to the Fund with respect to the country as to which the Custodian's acceptance of delegation is withdrawn.

3.2.3 SCOPE OF DELEGATED RESPONSIBILITIES:

(a) SELECTION OF ELIGIBLE FOREIGN CUSTODIANS. Subject to the provisions of this Section 3.2, the Foreign Custody Manager may place and maintain the Foreign Assets in the care of the Eligible Foreign Custodian selected by the Foreign Custody Manager in each country listed on Schedule A, as amended from time to time. In performing its delegated responsibilities as Foreign Custody Manager to place or maintain Foreign Assets with an Eligible Foreign Custodian, the Foreign Custody Manager shall determine that the Foreign Assets will be subject to reasonable care, based on the standards applicable to custodians in the country in which the Foreign Assets will be held by that Eligible Foreign Custodian, after considering all factors relevant to the safekeeping of such assets, including, without limitation the factors specified in Rule 17f-5(c)(1).

(b) CONTRACTS WITH ELIGIBLE FOREIGN CUSTODIANS. The Foreign Custody Manager shall determine that the contract governing the foreign custody arrangements with each Eligible Foreign Custodian selected by the Foreign Custody Manager will satisfy the requirements of Rule 17f-5(c)(2).

(c) MONITORING. In each case in which the Foreign Custody Manager maintains Foreign Assets with an Eligible Foreign Custodian selected by the Foreign Custody Manager, the Foreign Custody Manager shall establish a system to monitor (i) the appropriateness of maintaining the Foreign Assets with such Eligible Foreign Custodian and (ii) the contract governing the custody arrangements established by the Foreign Custody Manager with the Eligible Foreign Custodian. In the event the Foreign Custody Manager determines that the custody arrangements with an Eligible Foreign Custodian it has selected are no longer appropriate, the Foreign Custody Manager shall notify the Board in accordance with Section 3.2.5 hereunder.

3.2.4 GUIDELINES FOR THE EXERCISE OF DELEGATED AUTHORITY. For purposes of this Section 3.2, the Board shall be deemed to have considered and determined to accept such Country Risk as is incurred by placing and maintaining the Foreign Assets in each country for which the Custodian is serving as Foreign Custody Manager of the Portfolios.

3.2.5 REPORTING REQUIREMENTS. The Foreign Custody Manager shall report the withdrawal of the Foreign Assets from an Eligible Foreign Custodian and the placement of such Foreign Assets with another Eligible Foreign Custodian by providing to

12

the Board an amended Schedule A at the end of the calendar quarter in which an amendment to such Schedule has occurred. The Foreign Custody Manager shall make written reports notifying the Board of any other material change in the foreign custody arrangements of the Portfolios described in this Section 3.2 after the occurrence of the material change.

3.2.6 STANDARD OF CARE AS FOREIGN CUSTODY MANAGER OF A PORTFOLIO. In performing the responsibilities delegated to it, the Foreign Custody Manager agrees to exercise reasonable care, prudence and diligence such as a person having responsibility for the safekeeping of assets of management investment companies registered under the 1940 Act would exercise.

3.2.7 REPRESENTATIONS WITH RESPECT TO RULE 17F-5. The Foreign Custody Manager represents to the Fund that it is a U.S. Bank as defined in section (a)(7) of Rule 17f-5. The Fund represents to the Custodian that the Board has determined that it is reasonable for the Board to rely on the Custodian to perform the responsibilities delegated pursuant to this Contract to the Custodian as the Foreign Custody Manager of the Portfolios.

3.2.8 EFFECTIVE DATE AND TERMINATION OF THE CUSTODIAN AS FOREIGN CUSTODY MANAGER. The Board's delegation to the Custodian as Foreign Custody Manager of the Portfolios shall be effective as of the date hereof and shall remain in effect until terminated at any time, without penalty, by written notice from the terminating party to the non-terminating party. Termination will become effective thirty (30) days after receipt by the non-terminating party of such notice. The provisions of Section 3.2.2 hereof shall govern the delegation to and termination of the Custodian as Foreign Custody Manager of the Portfolios with respect to designated countries.

SECTION 3.3 ELIGIBLE SECURITIES DEPOSITORIES.

3.3.1 ANALYSIS AND MONITORING. The Custodian shall (a) provide the Fund (or its duly-authorized investment manager or investment advisor) with an analysis of the custody risks associated with maintaining assets with the Eligible Securities Depositories set forth on Schedule B hereto in accordance with section (a)(1)(i)(A) of Rule 17f-7, and (b) monitor such risks on a continuing basis, and promptly notify the Fund (or its duly-authorized investment manager or investment advisor) of any material change in such risks, in accordance with section (a)(1)(i)(B) of Rule 17f-7.

3.3.2 STANDARD OF CARE. The Custodian agrees to exercise reasonable care, prudence and diligence in performing the duties set forth in
Section 3.3.1.

SECTION 4. DUTIES OF THE CUSTODIAN WITH RESPECT TO PROPERTY OF THE PORTFOLIOS HELD OUTSIDE THE UNITED STATES

SECTION 4.1 DEFINITIONS. As used throughout this Agreement, the capitalized terms set forth below shall have the indicated meanings:

13

"Foreign Securities System" means an Eligible Securities Depository listed on Schedule B hereto.

"Foreign Sub-Custodian" means a foreign banking institution serving as an Eligible Foreign Custodian.

SECTION 4.2. HOLDING SECURITIES. The Custodian shall identify on its books as belonging to the Portfolios the foreign securities held by each Foreign Sub-Custodian or Foreign Securities System. The Custodian may hold foreign securities for all of its customers, including the Portfolios, with any Foreign Sub-Custodian in an account that is identified as belonging to the Custodian for the benefit of its customers, provided however, that (i) the records of the Custodian with respect to foreign securities of the Portfolios which are maintained in such account shall identify those securities as belonging to the Portfolios and (ii), to the extent permitted and customary in the market in which the account is maintained, the Custodian shall require that securities so held by the Foreign Sub-Custodian be held separately from any assets of such Foreign Sub-Custodian or of other customers of such Foreign Sub-Custodian.

SECTION 4.3. FOREIGN SECURITIES SYSTEMS. Foreign securities shall be maintained in a Foreign Securities System in a designated country through arrangements implemented by the Custodian or a Foreign Sub-Custodian, as applicable, in such country.

SECTION 4.4. TRANSACTIONS IN FOREIGN CUSTODY ACCOUNT.

4.4.1. DELIVERY OF FOREIGN ASSETS. The Custodian or a Foreign Sub-Custodian shall release and deliver foreign securities of the Portfolios held by the Custodian or such Foreign Sub-Custodian, or in a Foreign Securities System account, only upon receipt of Proper Instructions, which may be continuing instructions when deemed appropriate by the parties, and only in the following cases:

(i) upon the sale of such foreign securities for the Portfolio in accordance with commercially reasonable market practice in the country where such foreign securities are held or traded, including, without limitation: (A) delivery against expectation of receiving later payment; or (B) in the case of a sale effected through a Foreign Securities System, in accordance with the rules governing the operation of the Foreign Securities System;

(ii) in connection with any repurchase agreement related to foreign securities;

(iii) to the depository agent in connection with tender or other similar offers for foreign securities of the Portfolios;

14

(iv) to the issuer thereof or its agent when such foreign securities are called, redeemed, retired or otherwise become payable;

(v) to the issuer thereof, or its agent, for transfer into the name of the Custodian (or the name of the respective Foreign Sub-Custodian or of any nominee of the Custodian or such Foreign Sub-Custodian) or for exchange for a different number of bonds, certificates or other evidence representing the same aggregate face amount or number of units;

(vi) to brokers, clearing banks or other clearing agents for examination or trade execution in accordance with market custom; provided that in any such case the Foreign Sub-Custodian shall have no responsibility or liability for any loss arising from the delivery of such securities prior to receiving payment for such securities except as may arise from the Foreign Sub-Custodian's own negligence or willful misconduct;

(vii) for exchange or conversion pursuant to any plan of merger, consolidation, recapitalization, reorganization or readjustment of the securities of the issuer of such securities, or pursuant to provisions for conversion contained in such securities, or pursuant to any deposit agreement;

(viii) in the case of warrants, rights or similar foreign securities, the surrender thereof in the exercise of such warrants, rights or similar securities or the surrender of interim receipts or temporary securities for definitive securities;

(ix) for delivery as security in connection with any borrowing by the Portfolios requiring a pledge of assets by the Portfolios;

(x) in connection with trading in options and futures contracts, including delivery as original margin and variation margin;

(xi) in connection with the lending of foreign securities; and

(xii) for any other purpose, but only upon receipt of Proper Instructions specifying the foreign securities to be delivered and naming the person or persons to whom delivery of such securities shall be made.

4.4.2. PAYMENT OF PORTFOLIO MONIES. Upon receipt of Proper Instructions, which may be continuing instructions when deemed appropriate by the parties, the Custodian shall pay out, or direct the respective Foreign Sub-Custodian or the respective Foreign Securities System to pay out, monies of a Portfolio in the following cases only:

(i) upon the purchase of foreign securities for the Portfolio, unless otherwise directed by Proper Instructions, by (A) delivering money to the seller thereof or to a dealer therefor (or an agent for such seller or dealer) against

15

expectation of receiving later delivery of such foreign securities; or (B) in the case of a purchase effected through a Foreign Securities System, in accordance with the rules governing the operation of such Foreign Securities System;

(ii) in connection with the conversion, exchange or surrender of foreign securities of the Portfolio;

(iii) for the payment of any expense or liability of the Portfolio, including but not limited to the following payments: interest, taxes, investment advisory fees, transfer agency fees, fees under this Contract, legal fees, accounting fees, and other operating expenses;

(iv) for the purchase or sale of foreign exchange or foreign exchange contracts for the Portfolio, including transactions executed with or through the Custodian or its Foreign Sub-Custodians;

(v) in connection with trading in options and futures contracts, including delivery as original margin and variation margin;

(vi) for payment of part or all of the dividends received in respect of securities sold short;

(vii) in connection with the borrowing or lending of foreign securities; and

(viii) for any other purpose, but only upon receipt of Proper Instructions specifying the amount of such payment and naming the person or persons to whom such payment is to be made.

4.4.3. MARKET CONDITIONS. Notwithstanding any provision of this Contract to the contrary, settlement and payment for Foreign Assets received for the account of the Portfolios and delivery of Foreign Assets maintained for the account of the Portfolios may be effected in accordance with the customary established securities trading or processing practices and procedures in the country or market in which the transaction occurs, including, without limitation, delivering Foreign Assets to the purchaser thereof or to a dealer therefor (or an agent for such purchaser or dealer) with the expectation of receiving later payment for such Foreign Assets from such purchaser or dealer.

The Custodian shall provide to the Board the information with respect to custody and settlement practices in countries in which the Custodian employs a Foreign Sub-Custodian described on Schedule C hereto at the time or times set forth on such Schedule. The Custodian may revise Schedule C from time to time, provided that no such revision shall result in the Board being provided with substantively less information than had been previously provided hereunder.

16

SECTION 4.5. REGISTRATION OF FOREIGN SECURITIES. The foreign securities maintained in the custody of a Foreign Sub-Custodian (other than bearer securities) shall be registered in the name of the applicable Portfolio or in the name of the Custodian or in the name of any Foreign Sub-Custodian or in the name of any nominee of the foregoing, and the Fund on behalf of such Portfolio agrees to hold any such nominee harmless from any liability as a holder of record of such foreign securities. The Custodian or a Foreign Sub-Custodian shall not be obligated to accept securities on behalf of a Portfolio under the terms of this Contract unless the form of such securities and the manner in which they are delivered are in accordance with reasonable market practice.

SECTION 4.6 BANK ACCOUNTS. The Custodian shall identify on its books as belonging to the Fund cash (including cash denominated in foreign currencies) deposited with the Custodian. Where the Custodian is unable to maintain, or market practice does not facilitate the maintenance of, cash on the books of the Custodian, a bank account or bank accounts shall be opened and maintained outside the United States on behalf of a Portfolio with a Foreign Sub-Custodian. All accounts referred to in this Section shall be subject only to draft or order by the Custodian (or, if applicable, such Foreign Sub-Custodian) acting pursuant to the terms of this Agreement to hold cash received by or from or for the account of the Portfolio. Cash maintained on the books of the Custodian (including its branches, subsidiaries and affiliates), regardless of currency denomination, is maintained in bank accounts established under, and subject to the laws of, The Commonwealth of Massachusetts.

SECTION 4.7. COLLECTION OF INCOME. The Custodian shall use reasonable commercial efforts to collect all income and other payments with respect to the Foreign Assets held hereunder to which the Portfolios shall be entitled and shall credit such income, as collected, to the applicable Portfolio. In the event that extraordinary measures are required to collect such income, the Fund and the Custodian shall consult as to such measures and as to the compensation and expenses of the Custodian relating to such measures.

SECTION 4.8 SHAREHOLDER RIGHTS. With respect to the foreign securities held pursuant to this Section 4, the Custodian will use reasonable commercial efforts to facilitate the exercise of voting and other shareholder rights, subject always to the laws, regulations and practical constraints that may exist in the country where such securities are issued. The Fund acknowledges that local conditions, including lack of regulation, onerous procedural obligations, lack of notice and other factors may have the effect of severely limiting the ability of the Fund to exercise shareholder rights.

SECTION 4.9. COMMUNICATIONS RELATING TO FOREIGN SECURITIES. The Custodian shall transmit promptly to the Fund written information with respect to materials received by the Custodian via the Foreign Sub-Custodians from issuers of the foreign securities being held for the account of the Portfolios (including, without limitation, pendency of calls and maturities of foreign securities and expirations of rights in connection therewith). With respect to tender or exchange offers, the Custodian shall transmit promptly to the Fund written information with respect to materials so received by the Custodian from issuers of the foreign securities whose tender or exchange is sought or from the party (or its agents) making the tender or exchange

17

offer. The Custodian shall not be liable for any untimely exercise of any tender, exchange or other right or power in connection with foreign securities or other property of the Portfolios at any time held by it unless (i) the Custodian or the respective Foreign Sub-Custodian is in actual possession of such foreign securities or property and (ii) the Custodian receives Proper Instructions with regard to the exercise of any such right or power, and both
(i) and (ii) occur at least three business days prior to the date on which the Custodian is to take action to exercise such right or power.

SECTION 4.10. LIABILITY OF FOREIGN SUB-CUSTODIANS. Each agreement pursuant to which the Custodian employs a Foreign Sub-Custodian shall, to the extent possible, require the Foreign Sub-Custodian to exercise reasonable care in the performance of its duties, and to indemnify, and hold harmless, the Custodian from and against any loss, damage, cost, expense, liability or claim arising out of or in connection with the Foreign Sub-Custodian's performance of such obligations. At the Fund's election, the Portfolios shall be entitled to be subrogated to the rights of the Custodian with respect to any claims against a Foreign Sub-Custodian as a consequence of any such loss, damage, cost, expense, liability or claim if and to the extent that the Portfolios have not been made whole for any such loss, damage, cost, expense, liability or claim.

SECTION 4.11 TAX LAW. The Custodian shall have no responsibility or liability for any obligations now or hereafter imposed on the Fund, the Portfolios or the Custodian as custodian of the Portfolios by the tax law of the United States or of any state or political subdivision thereof. It shall be the responsibility of the Fund to notify the Custodian of the obligations imposed on the Fund with respect to the Portfolios or the Custodian as custodian of the Portfolios by the tax law of countries other than those mentioned in the above sentence, including responsibility for withholding and other taxes, assessments or other governmental charges, certifications and governmental reporting. The sole responsibility of the Custodian with regard to such tax law shall be to use reasonable efforts to assist the Fund with respect to any claim for exemption or refund under the tax law of countries for which the Fund has provided such information.

SECTION 4.12. LIABILITY OF CUSTODIAN. The Custodian shall be liable for the acts or omissions of a Foreign Sub-Custodian to the same extent as set forth with respect to sub-custodians generally in the Contract and, regardless of whether assets are maintained in the custody of a Foreign Sub-Custodian or a Foreign Securities System, the Custodian shall not be liable for any loss, damage, cost, expense, liability or claim resulting from nationalization, expropriation, currency restrictions, or acts of war or terrorism, or any other loss where the Sub-Custodian has otherwise acted with reasonable care.

SECTION 5. PAYMENTS FOR SALES OR REPURCHASES OR REDEMPTIONS OF SHARES

The Custodian shall receive from the distributor for the Shares or from the Transfer Agent and deposit into the account of the appropriate Portfolio such payments as are received for Shares thereof issued or sold from time to time by the Fund. The Custodian will provide timely

18

notification to the Fund on behalf of each such Portfolio and the Transfer Agent of any receipt by it of payments for Shares of such Portfolio.

From such funds as may be available for the purpose, the Custodian shall, upon receipt of instructions from the Transfer Agent, make funds available for payment to holders of Shares who have delivered to the Transfer Agent a request for redemption or repurchase of their Shares. In connection with the redemption or repurchase of Shares, the Custodian is authorized upon receipt of instructions from the Transfer Agent to wire funds to or through a commercial bank designated by the redeeming shareholders. In connection with the redemption or repurchase of Shares, the Custodian shall honor checks drawn on the Custodian by a holder of Shares, which checks have been furnished by the Fund to the holder of Shares, when presented to the Custodian in accordance with such procedures and controls as are mutually agreed upon from time to time between the Fund and the Custodian.

SECTION 6. PROPER INSTRUCTIONS

Proper Instructions as used throughout this Agreement means a writing signed or initialed by one or more person or persons as the Board shall have from time to time authorized. Each such writing shall set forth the specific transaction or type of transaction involved, including a specific statement of the purpose for which such action is requested. Oral instructions will be considered Proper Instructions if the Custodian reasonably believes them to have been given by a person authorized to give such instructions with respect to the transaction involved. The Fund shall cause all oral instructions to be confirmed in writing. Proper Instructions may include communications effected directly between electro-mechanical or electronic devices provided that the Fund and the Custodian agree to security procedures, including but not limited to, the security procedures selected by the Fund in the Funds Transfer Addendum attached hereto. For purposes of this Section, Proper Instructions shall include instructions received by the Custodian pursuant to any three-party agreement which requires a segregated asset account in accordance with Section 2.9.

SECTION 7. ACTIONS PERMITTED WITHOUT EXPRESS AUTHORITY

The Custodian may in its discretion, without express authority from the Fund on behalf of each applicable Portfolio:

1) make payments to itself or others for minor expenses of handling securities or other similar items relating to its duties under this Agreement, provided that all such payments shall be accounted for to the Fund on behalf of the Portfolio;

2) surrender securities in temporary form for securities in definitive form;

3) endorse for collection, in the name of the Portfolio, checks, drafts and other negotiable instruments; and

19

4) in general, attend to all non-discretionary details in connection with the sale, exchange, substitution, purchase, transfer and other dealings with the securities and property of the Portfolio except as otherwise directed by the Board.

SECTION 8. EVIDENCE OF AUTHORITY

The Custodian shall be protected in acting upon any instructions, notice, request, consent, certificate or other instrument or paper believed by it to be genuine and to have been properly executed by or on behalf of the Fund. The Custodian may receive and accept a copy of a resolution certified by the Secretary or an Assistant Secretary of the Fund ("CERTIFIED RESOLUTION") as conclusive evidence (a) of the authority of any person to act in accordance with such resolution or (b) of any determination or of any action by the Board as described in such resolution, and such resolution may be considered as in full force and effect until receipt by the Custodian of written notice to the contrary.

SECTION 9. DUTIES OF CUSTODIAN WITH RESPECT TO THE BOOKS OF ACCOUNT AND CALCULATION OF NET ASSET VALUE AND NET INCOME

The Custodian shall cooperate with and supply necessary information to the entity or entities appointed by the Board to keep the books of account of each Portfolio and/or compute the net asset value per Share of the outstanding Shares or, if directed in writing to do so by the Fund on behalf of the Portfolio, shall itself keep such books of account and/or compute such net asset value per Share. If so directed, the Custodian shall also calculate daily the net income of the Portfolio as described in the Prospectus and shall advise the Fund and the Transfer Agent daily of the total amounts of such net income and, if instructed in writing by an officer of the Fund to do so, shall advise the Transfer Agent periodically of the division of such net income among its various components. The Fund acknowledges and agrees that, with respect to investments maintained with the Underlying Transfer Agent, the Underlying Transfer Agent is the sole source of information on the number of shares of a fund held by it on behalf of a Portfolio and that the Custodian has the right to rely on holdings information furnished by the Underlying Transfer Agent to the Custodian in performing its duties under this Agreement, including without limitation, the duties set forth in this Section 9 and in Section 10 hereof; provided, however, that the Custodian shall be obligated to reconcile information as to purchases and sales of Underlying Shares contained in trade instructions and confirmations received by the Custodian and to report promptly any discrepancies to the Underlying Transfer Agent. The calculations of the net asset value per Share and the daily income of each Portfolio shall be made at the time or times described from time to time in the Prospectus.

SECTION 10. RECORDS

20

The Custodian shall with respect to each Portfolio create and maintain all records relating to its activities and obligations under this Agreement in such manner as will meet the obligations of the Fund under the 1940 Act, with particular attention to Section 31 thereof and Rules 31a-1 and 31a-2 thereunder. All such records shall be the property of the Fund and shall at all times during the regular business hours of the Custodian be open for inspection by duly authorized officers, employees or agents of the Fund and employees and agents of the SEC. The Custodian shall, at the Fund's request, supply the Fund with a tabulation of securities owned by each Portfolio and held by the Custodian and shall, when requested to do so by the Fund and for such compensation as shall be agreed upon between the Fund and the Custodian, include certificate numbers in such tabulations.

SECTION 11. OPINION OF FUND'S INDEPENDENT ACCOUNTANT

The Custodian shall take all reasonable action, as the Fund on behalf of each applicable Portfolio may from time to time request, to obtain from year to year favorable opinions from the Fund's independent accountants with respect to its activities hereunder in connection with the preparation of the Fund's Form N-1A, and Form N-SAR or other annual reports to the SEC and with respect to any other requirements thereof.

SECTION 12. REPORTS TO FUND BY INDEPENDENT PUBLIC ACCOUNTANTS

The Custodian shall provide the Fund, on behalf of each of the Portfolios at such times as the Fund may reasonably require, with reports by independent public accountants on the accounting system, internal accounting control and procedures for safeguarding securities, futures contracts and options on futures contracts, including securities deposited and/or maintained in a U.S. Securities System or a Foreign Securities System, relating to the services provided by the Custodian under this Agreement; such reports, shall be of sufficient scope and in sufficient detail, as may reasonably be required by the Fund to provide reasonable assurance that any material inadequacies would be disclosed by such examination, and, if there are no such inadequacies, the reports shall so state.

SECTION 13. COMPENSATION OF CUSTODIAN

The Custodian shall be entitled to reasonable compensation for its services and expenses as Custodian, as agreed upon from time to time between the Fund on behalf of each applicable Portfolio and the Custodian.

SECTION 14. RESPONSIBILITY OF CUSTODIAN

So long as and to the extent that it is in the exercise of reasonable care, the Custodian shall not be responsible for the title, validity or genuineness of any property or evidence of title thereto

21

received by it or delivered by it pursuant to this Agreement and shall be held harmless in acting upon any notice, request, consent, certificate or other instrument reasonably believed by it to be genuine and to be signed by the proper party or parties, including any futures commission merchant acting pursuant to the terms of a three-party futures or options agreement. The Custodian shall be held to the exercise of reasonable care in carrying out the provisions of this Agreement, but shall be kept indemnified by and shall be without liability to the Fund for any action taken or omitted by it in good faith without negligence, including, without limitation, acting in accordance with any Proper Instruction. It shall be entitled to rely on and may act upon advice of counsel (who may be counsel for the Fund) on all matters, and shall be without liability for any action reasonably taken or omitted pursuant to such advice. The Custodian shall be without liability to the Fund and the Portfolios for any loss, liability, claim or expense resulting from or caused by anything which is part of Country Risk (as defined in Section 3 hereof), including without limitation nationalization, expropriation, currency restrictions, or acts of war, revolution, riots or terrorism.

Except as may arise from the Custodian's own negligence or willful misconduct or the negligence or willful misconduct of a sub-custodian or agent, the Custodian shall be without liability to the Fund for any loss, liability, claim or expense resulting from or caused by; (i) events or circumstances beyond the reasonable control of the Custodian or any sub-custodian or Securities System or any agent or nominee of any of the foregoing, including, without limitation, the interruption, suspension or restriction of trading on or the closure of any securities market, power or other mechanical or technological failures or interruptions, computer viruses or communications disruptions, work stoppages, natural disasters, or other similar events or acts; (ii) errors by the Fund or its duly-authorized investment manager or investment advisor in their instructions to the Custodian provided such instructions have been in accordance with this Agreement; (iii) the insolvency of or acts or omissions by a Securities System; (iv) any delay or failure of any broker, agent or intermediary, central bank or other commercially prevalent payment or clearing system to deliver to the Custodian's sub-custodian or agent securities purchased or in the remittance or payment made in connection with securities sold; (v) any delay or failure of any company, corporation, or other body in charge of registering or transferring securities in the name of the Custodian, the Fund, the Custodian's sub-custodians, nominees or agents or any consequential losses arising out of such delay or failure to transfer such securities including non-receipt of bonus, dividends and rights and other accretions or benefits;
(vi) delays or inability to perform its duties due to any disorder in market infrastructure with respect to any particular security or Securities System; and
(vii) any provision of any present or future law or regulation or order of the United States of America, or any state thereof, or any other country, or political subdivision thereof or of any court of competent jurisdiction.

The Custodian shall be liable for the acts or omissions of a Foreign Sub-Custodian (as defined in Section 4 hereof) to the same extent as set forth with respect to sub-custodians generally in this Agreement.

If the Fund on behalf of a Portfolio requires the Custodian to take any action with respect to securities, which action involves the payment of money or which action may, in the opinion of

22

the Custodian, result in the Custodian or its nominee assigned to the Fund or the Portfolio being liable for the payment of money or incurring liability of some other form, the Fund on behalf of the Portfolio, as a prerequisite to requiring the Custodian to take such action, shall provide indemnity to the Custodian in an amount and form satisfactory to it.

If the Fund requires the Custodian, its affiliates, subsidiaries or agents, to advance cash or securities for any purpose (including but not limited to securities settlements, foreign exchange contracts and assumed settlement) or in the event that the Custodian or its nominee shall incur or be assessed any taxes, charges, expenses, assessments, claims or liabilities in connection with the performance of this Agreement, except such as may arise from its or its nominee's own negligent action, negligent failure to act or willful misconduct, any property at any time held for the account of the applicable Portfolio shall be security therefor and should the Fund fail to repay the Custodian promptly, the Custodian shall be entitled to utilize available cash and to dispose of such Portfolio's assets to the extent necessary to obtain reimbursement.

In no event shall the Custodian be liable for indirect, special or consequential damages.

SECTION 15. EFFECTIVE PERIOD, TERMINATION AND AMENDMENT

This Agreement shall become effective as of its execution, shall continue in full force and effect until terminated as hereinafter provided, may be amended at any time by mutual agreement of the parties hereto and may be terminated by either party by an instrument in writing delivered or mailed, postage prepaid to the other party, such termination to take effect not sooner than sixty (60) days after the date of such delivery or mailing; provided, however, that the Fund shall not amend or terminate this Agreement in contravention of any applicable federal or state regulations, or any provision of the Fund's Declaration of Trust, and further provided, that the Fund on behalf of one or more of the Portfolios may at any time by action of its Board (i) substitute another bank or trust company for the Custodian by giving notice as described above to the Custodian, or (ii) immediately terminate this Agreement in the event of the appointment of a conservator or receiver for the Custodian by the Comptroller of the Currency or upon the happening of a like event at the direction of an appropriate regulatory agency or court of competent jurisdiction.

Upon termination of the Agreement, the Fund on behalf of each applicable Portfolio shall pay to the Custodian such compensation as may be due as of the date of such termination and shall likewise reimburse the Custodian for its costs, expenses and disbursements.

SECTION 16. SUCCESSOR CUSTODIAN

If a successor custodian for one or more Portfolios shall be appointed by the Board, the Custodian shall, upon termination, deliver to such successor custodian at the office of the Custodian, duly endorsed and in the form for transfer, all securities of each applicable Portfolio

23

then held by it hereunder and shall transfer to an account of the successor custodian all of the securities of each such Portfolio held in a Securities System or at an Underlying Transfer Agent.

If no such successor custodian shall be appointed, the Custodian shall, in like manner, upon receipt of a Certified Resolution, deliver at the office of the Custodian and transfer such securities, funds and other properties in accordance with such resolution.

In the event that no written order designating a successor custodian or Certified Resolution shall have been delivered to the Custodian on or before the date when such termination shall become effective, then the Custodian shall have the right to deliver to a bank or trust company, which is a "bank" as defined in the 1940 Act, doing business in Boston, Massachusetts, or New York, New York, of its own selection, having an aggregate capital, surplus, and undivided profits, as shown by its last published report, of not less than $25,000,000, all securities, funds and other properties held by the Custodian on behalf of each applicable Portfolio and all instruments held by the Custodian relative thereto and all other property held by it under this Agreement on behalf of each applicable Portfolio, and to transfer to an account of such successor custodian all of the securities of each such Portfolio held in any Securities System or at an Underlying Transfer Agent. Thereafter, such bank or trust company shall be the successor of the Custodian under this Agreement.

In the event that securities, funds and other properties remain in the possession of the Custodian after the date of termination hereof owing to failure of the Fund to procure the Certified Resolution to appoint a successor custodian, the Custodian shall be entitled to fair compensation for its services during such period as the Custodian retains possession of such securities, funds and other properties and the provisions of this Agreement relating to the duties and obligations of the Custodian shall remain in full force and effect.

SECTION 17. INTERPRETIVE AND ADDITIONAL PROVISIONS

In connection with the operation of this Agreement, the Custodian and the Fund on behalf of each of the Portfolios, may from time to time agree on such provisions interpretive of or in addition to the provisions of this Agreement as may in their joint opinion be consistent with the general tenor of this Agreement. Any such interpretive or additional provisions shall be in a writing signed by both parties and shall be annexed hereto, provided that no such interpretive or additional provisions shall contravene any applicable federal or state regulations or any provision of the Fund's Declaration of Trust. No interpretive or additional provisions made as provided in the preceding sentence shall be deemed to be an amendment of this Agreement.

SECTION 18. ADDITIONAL FUNDS

In the event that the Fund establishes one or more series of Shares in addition to State Street Equity 500 Index Fund, State Street Equity 400 Index Fund, State Street Equity 2000 Index

24

Fund, State Street MSCI EAFE Index Fund and State Street Aggregate Bond Index Fund with respect to which it desires to have the Custodian render services as custodian under the terms hereof, it shall so notify the Custodian in writing, and if the Custodian agrees in writing to provide such services, such series of Shares shall become a Portfolio hereunder.

SECTION 19. MASSACHUSETTS LAW TO APPLY

This Agreement shall be construed and the provisions thereof interpreted under and in accordance with laws of The Commonwealth of Massachusetts.

SECTION 20. PRIOR AGREEMENTS

This Agreement supersedes and terminates, as of the date hereof, all prior Agreements between the Fund on behalf of each of the Portfolios and the Custodian relating to the custody of the Fund's assets.

SECTION 21. NOTICES.

Any notice, instruction or other instrument required to be given hereunder may be delivered in person to the offices of the parties as set forth herein during normal business hours or delivered prepaid registered mail or by telex, cable or telecopy to the parties at the following addresses or such other addresses as may be notified by any party from time to time.

To the Fund:                   State Street Institutional Investment Trust
                               c/o State Street Bank and Trust Company
                               P.O. Box 1713
                               Boston, Massachusetts  02105-1713
                               Attention:  Julie Tedesco
                               Telephone:  617-662-3979
                               Telecopy:  617-662-3805

To the Custodian:                         STATE STREET BANK AND TRUST COMPANY
                                          150 Newport Avenue
                                          Allan Forbes Building AFB3
                                          North Quincy, Massachusetts 02171

                                          Attention: Louis Abruzzi, Jr.
                                          Telephone: 617-985-5491
                                          Telecopy: 617-537-2498

Such notice, instruction or other instrument shall be deemed to have been served in the case of a registered letter at the expiration of five business days after posting, in the case of cable

25

twenty-four hours after dispatch and, in the case of telex, immediately on dispatch and if delivered outside normal business hours it shall be deemed to have been received at the next time after delivery when normal business hours commence and in the case of cable, telex or telecopy on the business day after the receipt thereof. Evidence that the notice was properly addressed, stamped and put into the post shall be conclusive evidence of posting.

SECTION 22. REPRODUCTION OF DOCUMENTS

This Agreement and all schedules, addenda, exhibits, attachments and amendments hereto may be reproduced by any photographic, photostatic, microfilm, micro-card, miniature photographic or other similar process. The parties hereto all/each agree that any such reproduction shall be admissible in evidence as the original itself in any judicial or administrative proceeding, whether or not the original is in existence and whether or not such reproduction was made by a party in the regular course of business, and that any enlargement, facsimile or further reproduction of such reproduction shall likewise be admissible in evidence.

SECTION 23. REMOTE ACCESS SERVICES ADDENDUM

The Custodian and the Fund agree to be bound by the terms of the Remote Access Services Addendum attached hereto.

SECTION 24. SHAREHOLDER COMMUNICATIONS ELECTION

SEC Rule 14b-2 requires banks which hold securities for the account of customers to respond to requests by issuers of securities for the names, addresses and holdings of beneficial owners of securities of that issuer held by the bank unless the beneficial owner has expressly objected to disclosure of this information. In order to comply with the rule, the Custodian needs the Fund to indicate whether it authorizes the Custodian to provide the Fund's name, address, and share position to requesting companies whose securities the Fund owns. If the Fund tells the Custodian "no", the Custodian will not provide this information to requesting companies. If the Fund tells the Custodian "yes" or does not check either "yes" or "no" below, the Custodian is required by the rule to treat the Fund as consenting to disclosure of this information for all securities owned by the Fund or any funds or accounts established by the Fund. For the Fund's protection, the Rule prohibits the requesting company from using the Fund's name and address for any purpose other than corporate communications. Please indicate below whether the Fund consents or objects by checking one of the alternatives below.

YES [ ] The Custodian is authorized to release the Fund's name, address, and share positions.

NO [X] The Custodian is not authorized to release the Fund's name, address, and share positions.

26

IN WITNESS WHEREOF, each of the parties has caused this instrument to be executed in its name and behalf by its duly authorized representative and its seal to be hereunder affixed as of February 14, 2001.

STATE STREET INSTITUTIONAL
INVESTMENT TRUST FUND SIGNATURE ATTESTED TO BY:

By:    /s/Kathleen C. Cuocolo                By:     /s/Julie A. Tedesco
       -------------------------------               ---------------------

Name:  Kathleen C. Cuocolo                   Name:   Julie A. Tedesco
       -------------------------------               ---------------------

Title: President                             Title:  Assistant Secretary
       -------------------------------               ---------------------

STATE STREET BANK AND TRUST COMPANY SIGNATURE ATTESTED TO BY:

By:    /s/Ronald E. Logue                    By:     /s/Nelson H. Graves
       ------------------------------               ----------------------

Name:  Ronald E. Logue                       Name:    Nelson H. Graves
       ------------------------------               ----------------------

Title: Vice Chairman &                       Title:  Vice President and Counsel
       ------------------------------               ---------------------------
       Chief Operating Officer
       ------------------------------


REMOTE ACCESS SERVICES ADDENDUM TO CUSTODIAN AGREEMENT

ADDENDUM to that certain Amended and Restated Custodian Agreement dated as of February 14, 2001 (the "Custodian Agreement") between State Street Institutional Investment Trust (the "Customer") and State Street Bank and Trust Company, including its subsidiaries and affiliates ("State Street").

State Street has developed and utilizes proprietary accounting and other systems in conjunction with the custodian services which State Street provides to the Customer. In this regard, State Street maintains certain information in databases under its control and ownership which it makes available to its customers (the "Remote Access Services").

The Services

State Street agrees to provide the Customer, and its designated investment advisors, consultants or other third parties authorized by State Street ("Authorized Designees") with access to In~Sight(SM) as described in Exhibit A or such other systems as may be offered from time to time (the "System") on a remote basis.

Security Procedures

The Customer agrees to comply, and to cause its Authorized Designees to comply, with remote access operating standards and procedures and with user identification or other password control requirements and other security procedures as may be issued from time to time by State Street for use of the System and access to the Remote Access Services. The Customer agrees to advise State Street immediately in the event that it learns or has reason to believe that any person to whom it has given access to the System or the Remote Access Services has violated or intends to violate the terms of this Addendum and the Customer will cooperate with State Street in seeking injunctive or other equitable relief. The Customer agrees to discontinue use of the System and Remote Access Services, if requested, for any security reasons cited by State Street.

Fees

Fees and charges for the use of the System and the Remote Access Services and related payment terms shall be as set forth in the custody fee schedule in effect from time to time between the parties (the "Fee Schedule"). The Customer shall be responsible for any tariffs, duties or taxes imposed or levied by any government or governmental agency by reason of the transactions contemplated by this Addendum, including, without limitation, federal, state and local taxes, use, value added and personal property taxes (other than income, franchise or similar taxes which may be imposed or assessed against State Street). Any claimed exemption from such tariffs, duties or taxes shall be supported by proper documentary evidence delivered to State Street.

Proprietary Information/Injunctive Relief

The System and Remote Access Services described herein and the databases, computer programs, screen formats, report formats, interactive design techniques, formulae, processes, systems, software, know- how, algorithms, programs, training aids, printed materials, methods, books, records, files, documentation and other information made available to the Customer by State Street as part of the Remote Access Services and through the use of the System and all copyrights, patents, trade secrets and other proprietary rights of State Street related thereto are the exclusive, valuable and confidential property of State Street and its relevant licensors (the "Proprietary Information"). The Customer agrees on behalf of itself and its Authorized


Designees to keep the Proprietary Information confidential and to limit access to its employees and Authorized Designees (under a similar duty of confidentiality) who require access to the System for the purposes intended. The foregoing shall not apply to Proprietary Information in the public domain or required by law to be made public.

The Customer agrees to use the Remote Access Services only in connection with the proper purposes of this Addendum. The Customer will not, and will cause its employees and Authorized Designees not to, (i) permit any third party to use the System or the Remote Access Services, (ii) sell, rent, license or otherwise use the System or the Remote Access Services in the operation of a service bureau or for any purpose other than as expressly authorized under this Addendum, (iii) use the System or the Remote Access Services for any fund, trust or other investment vehicle without the prior written consent of State Street, or (iv) allow or cause any information transmitted from State Street's databases, including data from third party sources, available through use of the System or the Remote Access Services, to be published, redistributed or retransmitted for other than use for or on behalf of the Customer, as State Street's customer.

The Customer agrees that neither it nor its Authorized Designees will modify the System in any way; enhance or otherwise create derivative works based upon the System; or reverse engineer, decompile or otherwise attempt to secure the source code for all or any part of the System.

The Customer acknowledges that the disclosure of any Proprietary Information, or of any information which at law or equity ought to remain confidential, will immediately give rise to continuing irreparable injury to State Street inadequately compensable in damages at law and that State Street shall be entitled to obtain immediate injunctive relief against the breach or threatened breach of any of the foregoing undertakings, in addition to any other legal remedies which may be available.

Limited Warranties

State Street represents and warrants that it is the owner of and has the right to grant access to the System and to provide the Remote Access Services contemplated herein. Because of the nature of computer information technology and the necessity of relying upon third party sources, and data and pricing information obtained from third parties, the System and Remote Access Services are provided "AS IS", and the Customer and its Authorized Designees shall be solely responsible for the investment decisions, results obtained, regulatory reports and statements produced using the Remote Access Services. State Street and its relevant licensors will not be liable to the Customer or its Authorized Designees for any direct or indirect, special, incidental, punitive or consequential damages arising out of or in any way connected with the System or the Remote Access Services, nor shall either party be responsible for delays or nonperformance under this Addendum arising out of any cause or event beyond such party's control.

State Street will take reasonable steps to ensure that its products (and those of its third-party suppliers) reflect the available state of the art technology to offer products that are Year 2000 compliant, including, but not limited to, century recognition of dates, calculations that correctly compute same century and multi century formulas and date values, and interface values that reflect the date issues arising between now and December 31, 2099, and if any changes are required, State Street will make the changes to its products at no cost to you and in a commercially reasonable time frame and will require third-party suppliers to do likewise. The Customer will do likewise for its systems.

EXCEPT AS EXPRESSLY SET FORTH IN THIS ADDENDUM, STATE STREET, FOR ITSELF AND ITS RELEVANT LICENSORS, EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES CONCERNING THE SYSTEM AND THE SERVICES TO BE RENDERED HEREUNDER, WHETHER EXPRESS OR IMPLIED INCLUDING,


WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTIBILITY OR
FITNESS FOR A PARTICULAR PURPOSE.

Infringement

State Street will defend or, at our option, settle any claim or action brought against the Customer to the extent that it is based upon an assertion that access to the System or use of the Remote Access Services by the Customer under this Addendum constitutes direct infringement of any United States patent or copyright or misappropriation of a trade secret, provided that the Customer notifies State Street promptly in writing of any such claim or proceeding and cooperates with State Street in the defense of such claim or proceeding. Should the System or the Remote Access Services or any part thereof become, or in State Street's opinion be likely to become, the subject of a claim of infringement or the like under the patent or copyright or trade secret laws of the United States, State Street shall have the right, at State Street's sole option, to (i) procure for the Customer the right to continue using the System or the Remote Access Services, (ii) replace or modify the System or the Remote Access Services so that the System or the Remote Access Services becomes noninfringing, or (iii) terminate this Addendum without further obligation.

Termination

Either party to the Custodian Agreement may terminate this Addendum (i) for any reason by giving the other party at least one-hundred and eighty (180) days' prior written notice in the case of notice of termination by State Street to the Customer or thirty (30) days' notice in the case of notice from the Customer to State Street of termination, or (ii) immediately for failure of the other party to comply with any material term and condition of the Addendum by giving the other party written notice of termination. This Addendum shall in any event terminate within ninety (90) days after the termination of the Custodian Agreement. In the event of termination, the Customer will return to State Street all copies of documentation and other confidential information in its possession or in the possession of its Authorized Designees. The foregoing provisions with respect to confidentiality and infringement will survive termination for a period of three (3) years.

Miscellaneous

This Addendum and the exhibit hereto constitute the entire understanding of the parties to the Custodian Agreement with respect to access to the System and the Remote Access Services. This Addendum cannot be modified or altered except in a writing duly executed by each of State Street and the Customer and shall be governed by and construed in accordance with the laws of The Commonwealth of Massachusetts.

By its execution of the Custodian Agreement, the Customer accepts responsibility for its and its Authorized Designees' compliance with the terms of this Addendum.


EXHIBIT A
TO
REMOTE ACCESS SERVICES ADDENDUM TO CUSTODIAN AGREEMENT

IN~SIGHT(SM)
System Product Description

In~Sight(SM) provides information delivery and on-line access to State Street. In~Sight(SM) allows users a single point of entry into the many views of data created by the diverse systems and applications. Reports and data from systems such as Investment Policy Monitor(SM), Multicurrency Horizon(SM), Securities Lending, Performance & Analytics can be accessed through In~Sight(SM). This Internet-enabled application is designed to run from a Web browser and perform across low-speed data line or corporate high-speed backbones. In~Sight(SM) also offers users a flexible toolset, including an ad-hoc query function, a custom graphics package, a report designer, and a scheduling capability. Data and reports offered through In~Sight(SM) will continue to increase in direct proportion with the customer roll out, as it is viewed as the information delivery system will grow with State Street's customers.


Argentina                      Citibank, N.A.


Australia                      Westpac Banking Corporation


Austria                        Erste Bank der Osterreichischen
                               Sparkassen AG


Bahrain                        HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)


Bangladesh                     Standard Chartered Bank


Belgium                        Fortis Bank nv-sa


Bermuda                        The Bank of Bermuda Limited


Bolivia                        Citibank, N. A.


Botswana                       Barclays Bank of Botswana Limited


Brazil                         Citibank, N.A.


Bulgaria                       ING Bank N.V.


Canada                         State Street Trust Company Canada


Chile                          BankBoston, N.A.


People's Republic              The Hongkong and Shanghai
of China                       Banking Corporation Limited,
                               Shanghai and Shenzhen branches


Colombia                       Cititrust Colombia S.A. Sociedad Fiduciaria

Costa Rica                     Banco BCT S.A.


Croatia                        Privredna Banka Zagreb d.d


Cyprus                         The Cyprus Popular Bank Ltd.


Czech Republic                 Ceskoslovenska Obchodni
                               Banka, A.S.


Denmark                        Danske Bank A/S


Ecuador                        Citibank, N.A.


Egypt                          Egyptian British Bank S.A.E.
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)


Estonia                        Hansabank


Finland                        Merita Bank Plc.


France                         BNP Paribas, S.A.


Germany                        Dresdner Bank AG


Ghana                          Barclays Bank of Ghana Limited


Greece                         National Bank of Greece S.A.


Hong Kong                      Standard Chartered Bank


Hungary                        Citibank Rt.


Iceland                        Icebank Ltd.


India                          Deutsche Bank AG

                               The Hongkong and Shanghai
                               Banking Corporation Limited

Indonesia                      Standard Chartered Bank


Ireland                        Bank of Ireland


Israel                         Bank Hapoalim B.M.


Italy                          BNP Paribas, Italian Branch


Ivory Coast                    Societe Generale de Banques
                               en Cote d'Ivoire


Jamaica                        Scotiabank Jamaica Trust and Merchant
                               Bank Ltd.


Japan                          The Fuji Bank, Limited

                               The Sumitomo Bank, Limited


Jordan                         HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)


Kazakhstan                     HSBC Bank Kazakhstan


Kenya                          Barclays Bank of Kenya Limited


Republic of Korea              The Hongkong and Shanghai Banking
                               Corporation Limited


Latvia                         A/s Hansabanka


Lebanon                        HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)


Lithuania                      Vilniaus Bankas AB


Malaysia                       Standard Chartered Bank Malaysia Berhad

Mauritius                      The Hongkong and Shanghai
                               Banking Corporation Limited


Mexico                         Citibank Mexico, S.A.


Morocco                        Banque Commerciale du Maroc


Namibia                        Standard Bank Namibia Limited


Netherlands                    Fortis Bank (Nederland) N.V.


New Zealand                    ANZ Banking Group (New Zealand) Limited


Nigeria                        Stanbic Merchant Bank Nigeria Limited


Norway                         Christiania Bank og Kreditkasse ASA


Oman                           HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)


Pakistan                       Deutsche Bank AG


Palestine                      HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)
Panama                         BankBoston, N.A.


Peru                           Citibank, N.A.


Philippines                    Standard Chartered Bank


Poland                         Bank Handlowy w Warszawie S.A.


Portugal                       Banco Comercial Portugues


Qatar                          HSBC Bank Middle East
                               (as delegate of The Hongkong and
                               Shanghai Banking Corporation Limited)

Romania                        ING Bank N.V.

Russia                         Credit Suisse First Boston AO - Moscow
                               (as delegate of Credit Suisse
                               First Boston - Zurich)


Singapore                      The Development Bank of Singapore Limited


Slovak Republic                Ceskoslovenska Obchodni Banka, A.S.


Slovenia                       Bank Austria Creditanstalt d.d. - Ljubljana


South Africa                   Standard Bank of South Africa Limited


Spain                          Banco Santander Central Hispano S.A.


Sri Lanka                      The Hongkong and Shanghai
                               Banking Corporation Limited


Swaziland                      Standard Bank Swaziland Limited


Sweden                         Skandinaviska Enskilda Banken


Switzerland                    UBS AG


Taiwan - R.O.C.                Central Trust of China


Thailand                       Standard Chartered Bank


Trinidad & Tobago              Republic Bank Limited


Tunisia                        Banque Internationale Arabe de Tunisie


Turkey                         Citibank, N.A.


Ukraine                        ING Bank Ukraine


United Kingdom                 State Street Bank and Trust Company,
                               London Branch

Uruguay                        BankBoston, N.A.


Venezuela                      Citibank, N.A.


Vietnam                        The Hongkong and Shanghai
                               Banking Corporation Limited


Zambia                         Barclays Bank of Zambia Limited


Zimbabwe                       Barclays Bank of Zimbabwe Limited

Argentina                      Caja de Valores S.A.


Australia                      Austraclear Limited

                               Reserve Bank Information and
                               Transfer System


Austria                        Oesterreichische Kontrollbank AG
                               (Wertpapiersammelbank Division)


Belgium                        Caisse Interprofessionnelle de Depots et
                               de Virements de Titres, S.A.

                               Banque Nationale de Belgique


Brazil                         Companhia Brasileira de Liquidacao e Custodia

                               Sistema Especial de Liquidacao e de
                               Custodia (SELIC)

                               Central de Custodia e de Liquidacao Financeira de
                               Titulos Privados (CETIP)


Bulgaria                       Central Depository AD

                               Bulgarian National Bank


Canada                         Canadian Depository for Securities Limited


Chile                          Deposito Central de Valores S.A.


People's Republic              Shanghai Securities Central Clearing &
of China                       Registration Corporation

                               Shenzhen Securities Central Clearing Co., Ltd.


Colombia                       Deposito Centralizado de Valores


Costa Rica                     Central de Valores S.A.

Croatia                        Ministry of Finance

                               National Bank of Croatia

                               Sredisnja Depozitarna Agencija d.d.


Czech Republic                 Stredisko cennych papiru

                               Czech National Bank


Denmark                        Vaerdipapircentralen (Danish Securities Center)


Egypt                          Misr for Clearing, Settlement, and Depository


Estonia                        Eesti Vaartpaberite Keskdepositoorium


Finland                        Finnish Central Securities Depository


France                         Euroclear France


Germany                        Clearstream Banking AG, Frankfurt


Greece                         Bank of Greece,
                               System for Monitoring Transactions in
                               Securities in Book-Entry Form

                               Apothetirion Titlon AE -
                               Central Securities Depository


Hong Kong                      Central Clearing and Settlement System

                               Central Moneymarkets Unit


Hungary                        Kozponti Elszamolohaz es Ertektar
                               (Budapest) Rt. (KELER)

India                          National Securities Depository Limited

                               Central Depository Services India Limited

                               Reserve Bank of India


Indonesia                      Bank Indonesia

                               PT Kustodian Sentral Efek Indonesia


Israel                         Tel Aviv Stock Exchange Clearing
                               House Ltd. (TASE Clearinghouse)


Italy                          Monte Titoli S.p.A.


Ivory Coast                    Depositaire Central - Banque de Reglement


Jamaica                        Jamaica Central Securities Depository


Japan                          Japan Securities Depository Center (JASDEC)
                               Bank of Japan Net System


Kazakhstan                     Central Depository of Securities


Kenya                          Central Bank of Kenya


Republic of Korea              Korea Securities Depository


Latvia                         Latvian Central Depository

Lebanon                        Custodian and Clearing Center of
                               Financial Instruments for Lebanon
                               and the Middle East (Midclear) S.A.L.

                               Banque du Liban


Lithuania                      Central Securities Depository of Lithuania


Malaysia                       Malaysian Central Depository Sdn. Bhd.

                               Bank Negara Malaysia,
                               Scripless Securities Trading and Safekeeping


Mauritius                      Central Depository and Settlement Co. Ltd.

                               Bank of Mauritius


Mexico                         S.D. INDEVAL
                               (Instituto para el Deposito de Valores)


Morocco                        Maroclear


Netherlands                    Nederlands Centraal Instituut voor
                               Giraal Effectenverkeer B.V. (NECIGEF)


New Zealand                    New Zealand Central Securities
                               Depository Limited


Nigeria                        Central Securities Clearing System Limited


Norway                         Verdipapirsentralen (Norwegian Central
                               Securities Depository)


Oman                           Muscat Depository & Securities
                               Registration Company, SAOC



Pakistan                       Central Depository Company of Pakistan Limited

                               State Bank of Pakistan


Palestine                      Clearing Depository and Settlement, a department
                               of the Palestine Stock Exchange

Peru                           Caja de Valores y Liquidaciones, Institucion de
                               Compensacion y Liquidacion de Valores S.A


Philippines                    Philippine Central Depository, Inc.

                               Registry of Scripless Securities
                               (ROSS) of the Bureau of Treasury


Poland                         National Depository of Securities
                               (Krajowy Depozyt Papierow Wartosciowych SA)

                               Central Treasury Bills Registrar


Portugal                       Central de Valores Mobiliarios


Qatar                          Central Clearing and Registration (CCR), a
                               department of the Doha Securities Market


Romania                        National Securities Clearing, Settlement and
                               Depository Company

                               Bucharest Stock Exchange Registry Division

                               National Bank of Romania


Singapore                      Central Depository (Pte) Limited

                               Monetary Authority of Singapore


Slovak Republic                Stredisko cennych papierov

                               National Bank of Slovakia


Slovenia                       Klirinsko Depotna Druzba d.d.


South Africa                   Central Depository Limited

                               Share Transactions Totally Electronic
                               (STRATE) Ltd.


Spain                          Servicio de Compensacion y

                               Liquidacion de Valores, S.A.

                               Banco de Espana, Central de Anotaciones en Cuenta


Sri Lanka                      Central Depository System (Pvt) Limited


Sweden                         Vardepapperscentralen  VPC AB
                               (Swedish Central Securities Depository)


Switzerland                    SegaIntersettle AG (SIS)


Taiwan - R.O.C.                Taiwan Securities Central Depository Co., Ltd.


Thailand                       Thailand Securities Depository Company Limited


Tunisia                        Societe Tunisienne Interprofessionelle pour la
                               Compensation et de Depots des Valeurs Mobilieres


Turkey                         Takas ve Saklama Bankasi A.S. (TAKASBANK)

                               Central Bank of Turkey


Ukraine                        National Bank of Ukraine

United Kingdom                 Central Gilts Office and
                               Central Moneymarkets Office


Venezuela                      Banco Central de Venezuela


Zambia                         LuSE Central Shares Depository Limited

Bank of Zambia

TRANSNATIONAL

Euroclear

Clearstream Banking AG


The Guide to Custody in World Markets     An overview of safekeeping and
(annually)                                settlement practices and procedures in
                                          each market in which State Street Bank
                                          and Trust Company offers custodial
                                          services.

Global Custody Network Review             Information relating to the operating
(annually)                                history and structure of depositories
                                          and subcustodians located in the
                                          markets in which State Street Bank and
                                          Trust Company offers custodial
                                          services, including transnational
                                          depositories.

Global Legal Survey                       With respect to each market in which
(annually)                                State Street Bank and Trust Company
                                          offers custodial services, opinions
                                          relating to whether local law
                                          restricts (i) access of a fund's
                                          independent public accountants to
                                          books and records of a Foreign
                                          Sub-Custodian or Foreign Securities
                                          System, (ii) the Fund's ability to
                                          recover in the event of bankruptcy or
                                          insolvency of a Foreign Sub-Custodian
                                          or Foreign Securities System, (iii)
                                          the Fund's ability to recover in the
                                          event of a loss by a Foreign
                                          Sub-Custodian or Foreign Securities
                                          System, and (iv) the ability of a
                                          foreign investor to convert cash and
                                          cash equivalents to U.S. dollars.

Subcustodian Agreements                   Copies of the subcustodian contracts
                                          State Street Bank and Trust Company
                                          has entered into with each
                                          subcustodian in the markets in which
                                          State Street Bank and Trust Company
                                          offers subcustody services to its US
                                          mutual fund clients.

Network Bulletins (weekly):               Developments of interest to investors
                                          in the markets in which State Street
                                          Bank and Trust Company offers
                                          custodial services.

Foreign Custody Advisories (as            With respect to markets in which State
necessary):                               Street Bank and Trust Company offers
                                          custodial services which exhibit
                                          special custody risks, developments
                                          which may impact State Street's
                                          ability to deliver expected levels of
                                          service.


EXHIBIT C

As consideration for State Street Bank and Trust Company's services as administrator, custodian and transfer agent to each of the following Funds and such other services as the parties may from time to time agree and for State Street's assumption of ordinary operating expenses of the Funds, State Street shall receive from each Fund an annual administrative fee, accrued daily at the rate of 1/365th of the applicable fee rate of the following annual percentages of the Fund's average daily net assets during the month:

                                                            Annual percentage of
           Fund                                           average daily net assets
           ----                                           ------------------------
STATE STREET EQUITY 500 INDEX FUND                            .05%
           -  CLASS A SHARES
STATE STREET EQUITY 500 INDEX FUND                            .05%
           -  CLASS B SHARES
STATE STREET EQUITY 400 INDEX FUND                            .10%
STATE STREET EQUITY 2000 INDEX FUND                           .10%
STATE STREET MSCI(R) EAFE(R) INDEX FUND                       .10%
STATE STREET AGGREGATE BOND INDEX FUND                        .10%
STATE STREET MONEY MARKET FUND                                .05%
STATE STREET U.S. GOVERNMENT MONEY
MARKET FUND                                                   .05%


Exhibit 99.(h)(1)

TRANSFER AGENCY AND SERVICE AGREEMENT

AGREEMENT made as of the 28th day of February, 2000, by and between STATE STREET INSTITUTIONAL INVESTMENT TRUST, a Massachusetts business trust, having its principal office and place of business at 225 Franklin Street, Boston, Massachusetts 02110 (the "Trust"), and STATE STREET BANK AND TRUST COMPANY, a Massachusetts trust company having its principal office and place of business at 225 Franklin Street, Boston, Massachusetts 02110 (the "Bank").

WHEREAS, the Trust is registered as an open-end management investment company under the Investment Company Act of 1940, as amended (the "1940 Act"); and

WHEREAS, the Trust is authorized to issue shares in separate series, with each such series representing shares in a separate portfolio of securities and other assets;

WHEREAS, the Trust intends to initially offer shares in five (5) series, State Street Equity 500 Index Fund, State Street Equity 2000 Index Fund, State Street Equity 400 Index Fund, State Street MSCI(R) EAFE(R) Index Fund and State Street Aggregate Bond Index Fund (each herein referred to as a "Fund", and collectively as the "Funds");

WHEREAS, the parties hereto are contemporaneously entering into an Administration Agreement, dated the date hereof (the "Administration Agreement"), pursuant to which the Trust will delegate to the Bank certain responsibilities;

WHEREAS, the Trust on behalf of the Funds desires to appoint the Bank as its transfer agent, dividend disbursing agent, and agent in connection with certain other activities, and the Bank desires to accept such appointment;

NOW, THEREFORE, in consideration of the mutual covenants herein contained, the parties hereto agree as follows:

l. Terms of Appointment; Duties of the Bank

1.1 Subject to the terms and conditions set forth in this Agreement, the Trust, on behalf of the Funds, hereby employs and appoints the Bank to act as, and the Bank agrees to act as its transfer agent for the authorized and issued shares of beneficial interest, $ 0.001 par value of each Fund listed on Annex A hereto ("Shares"), and as the Trust's dividend disbursing agent.

1.2 The Bank agrees that it will perform the following services:


(a) In accordance with procedures established from time to time by agreement between the Trust on behalf of each of the Funds, as applicable, and the Bank, the Bank shall:

(i) Receive for acceptance, orders for the purchase of Shares, and promptly deliver payment and appropriate documentation thereof to the Custodian of the Trust (the "Custodian");

(ii) Pursuant to purchase orders, issue the appropriate number of Shares and hold such Shares in the appropriate Shareholder account;

(iii) Receive for acceptance redemption requests and redemption directions and deliver the appropriate documentation thereof to the Custodian;

(iv) At the appropriate time as and when it receives monies paid to it by the Custodian with respect to any redemption, pay over or cause to be paid over in the appropriate manner such monies as instructed by the redeeming Shareholders;

(v) Effect transfers of Shares by the registered owners thereof upon receipt of appropriate instructions;

(vi) Prepare and transmit payments for dividends and distributions declared by the Trust on behalf of the applicable Fund;

(vii) Maintain records of account for and advise the Trust and its Shareholders as to the foregoing; and

(viii) Record the issuance of Shares of the Trust and maintain pursuant to SEC Rule 17Ad-10(e) a record of the total number of Shares of the Trust which are authorized, based upon data provided to it by the Trust, and issued and outstanding. The Bank shall also provide the Trust on a regular basis with the total number of Shares which are authorized and issued and outstanding and shall have no obligation, when recording the issuance of Shares, to monitor the issuance of such Shares or to take cognizance of any laws relating to the issue or sale of such Shares, which functions shall be the sole responsibility of the Trust.

(b) In addition to and neither in lieu nor in contravention of the services set forth in the above paragraph (a), the Bank shall: (i) perform the customary services of a transfer agent and dividend disbursing agent including but not limited to: maintaining all Shareholder accounts, preparing Shareholder meeting lists, mailing proxy materials, Shareholder reports and prospectuses to current Shareholders, withholding taxes on U.S. resident and non-resident alien accounts, preparing and filing U.S. Treasury Department Forms 1099 and other appropriate forms required

2

with respect to dividends and distributions by federal authorities for all Shareholders, preparing and mailing confirmation forms and statements of account to Shareholders for all purchases and redemptions of Shares and other confirmable transactions in Shareholder accounts, preparing and mailing activity statements for Shareholders, and providing Shareholder account information.

(c) In addition, the Trust shall (i) identify to the Bank in writing those transactions and assets to be treated as exempt from blue sky reporting for each State and (ii) verify the establishment of transactions for each State on the system prior to activation and thereafter monitor the daily activity for each State. The responsibility of the Bank for the Trust's blue sky State registration status is solely limited to the initial establishment of transactions subject to blue sky compliance by the Trust and the reporting of such transactions to the Trust as provided above.

(d) The Bank shall provide additional services on behalf of the Trust (i.e., escheatment services) which may be agreed upon in writing between the Trust and the Bank.

2. Fees and Expenses

2.1 For the performance by the Bank pursuant to this Agreement, the Bank shall receive such fees as may be agreed to by the parties from time to time.

2.2 The Trust agrees on behalf of each of the Funds to pay all fees and reimbursable expenses within five days following the receipt of the respective billing notice. Postage for mailing of dividends, proxies, Trust reports and other mailings to all Shareholder accounts shall be advanced to the Bank by the Trust at least seven (7) days prior to the mailing date of such materials.

3. Representations and Warranties of the Bank

The Bank represents and warrants to the Trust that:

3.1 It is a trust company duly organized and existing under the laws of The Commonwealth of Massachusetts.

3.2 It is duly qualified to carry on its business in The Commonwealth of Massachusetts.

3.3 It is empowered under applicable laws and by its Charter and By-Laws to act as transfer agent and dividend disbursing agent and to enter into and perform this Agreement.

3.4 All requisite corporate proceedings have been taken to authorize it to enter into and perform this Agreement.

3.5 It has and will continue to have access to the necessary facilities, equipment and personnel to perform its duties and obligations under this Agreement.

3

4. Representations and Warranties of the Trust

The Trust represents and warrants to the Bank that:

4.1 It is a trust duly organized and existing and in good standing under the laws of The Commonwealth of Massachusetts.

4.2 It is empowered under applicable laws and by its Declaration of Trust and By-Laws to enter into and perform this Agreement.

4.3 All corporate proceedings required by said Declaration of Trust and By-Laws have been taken to authorize it to enter into and perform this Agreement.

4.4 It is an open-end management investment company registered under the Investment Company Act of 1940, as amended.

4.5 A registration statement under the Investment Company Act of 1940, as amended, on behalf of each of the Funds has been filed with the Securities and Exchange Commission.

5. Data Access and Proprietary Information

5.1 The Trust acknowledges that the data bases, computer programs, screen formats, report formats, interactive design techniques, and documentation manuals furnished to the Trust by the Bank as part of the Trust's ability to access certain Trust-related data ("Customer Data") maintained by the Bank on data bases under the control and ownership of the Bank or other third party ("Data Access Services") constitute copyrighted, trade secret, or other proprietary information (collectively, "Proprietary Information") of substantial value to the Bank or other third party. In no event shall Proprietary Information be deemed Customer Data. The Trust agrees to treat all Proprietary Information as proprietary to the Bank and further agrees that it shall not divulge any Proprietary Information to any person or organization except as may be provided hereunder. Without limiting the foregoing, the Trust agrees for itself and its employees and agents:

(a) to access Customer Data solely from locations as may be designated in writing by the Bank and solely in accordance with the Bank's applicable user documentation;

(b) to refrain from copying or duplicating in any way the Proprietary Information;

(c) to refrain from obtaining unauthorized access to any portion of the Proprietary Information, and if such access is inadvertently obtained, to inform in a timely manner of such fact and dispose of such information in accordance with the Bank's instructions;

4

(d) to refrain from causing or allowing the data acquired hereunder from being retransmitted to any other computer facility or other location, except with the prior written consent of the Bank;

(e) that the Trust shall have access only to those authorized transactions agreed upon by the parties;

(f) to honor all reasonable written requests made by the Bank to protect at the Bank's expense the rights of the Bank in Proprietary Information at common law, under federal copyright law and under other federal or state law.

Each party shall take reasonable efforts to advise its employees of their obligations pursuant to this Section 5. The obligations of this Section shall survive any earlier termination of this Agreement.

5.2 If the Trust notifies the Bank that any of the Data Access Services do not operate in material compliance with the most recently issued user documentation for such services, the Bank shall endeavor in a timely manner to correct such failure. Organizations from which the Bank may obtain certain data included in the Data Access Services are solely responsible for the contents of such data and the Trust agrees to make no claim against the Bank arising out of the contents of such third-party data, including, but not limited to, the accuracy thereof. DATA ACCESS SERVICES AND ALL COMPUTER PROGRAMS AND SOFTWARE SPECIFICATIONS USED IN CONNECTION THEREWITH ARE PROVIDED ON AN AS IS, AS AVAILABLE BASIS. THE BANK EXPRESSLY DISCLAIMS ALL WARRANTIES EXCEPT THOSE EXPRESSLY STATED HEREIN INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

5.3 If the transactions available to the Trust include the ability to originate electronic instructions to the Bank in order to (i) effect the transfer or movement of cash or Shares or (ii) transmit Shareholder information or other information, then in such event the Bank shall be entitled to rely on the validity and authenticity of such instruction without undertaking any further inquiry as long as such instruction is undertaken in conformity with security procedures established by the Bank from time to time.

6. Indemnification

6.1 The Bank shall not be responsible for, and the Trust shall on behalf of the applicable Fund indemnify and hold the Bank harmless from and against, any and all losses, damages, costs, charges, counsel fees, payments, expenses and liability arising out of or attributable to:

(a) All actions of the Bank or its agents or subcontractors required to be taken pursuant to this Agreement, provided that such actions are taken in good faith and without negligence or willful misconduct.

5

(b) The Trust's negligence, willful misconduct or lack of good faith which arise out of the breach of any representation or warranty of the Trust hereunder.

(c) The reliance on or use by the Bank or its agents or subcontractors of information, records, documents or services which (i) are received by the Bank or its agents or subcontractors, and (ii) have been prepared, maintained or performed by the Trust or any other person or firm on behalf of the Trust including but not limited to any previous transfer agent or registrar.

(d) The reliance on, or the carrying out by the Bank or its agents or subcontractors of any instructions or requests of the Trust on behalf of the applicable Fund.

(e) The offer or sale of Shares in violation of any requirement under the federal securities laws or regulations or the securities laws or regulations of any state that such Shares be registered in such state or in violation of any stop order or other determination or ruling by any federal agency or any state with respect to the offer or sale of such Shares in such state.

6.2 At any time the Bank may apply to any officer of the Trust for instructions, and may consult with legal counsel with respect to any matter arising in connection with the services to be performed by the Bank under this Agreement, and the Bank and its agents or subcontractors shall not be liable and shall be indemnified by the Trust on behalf of the applicable Fund for any action taken or omitted by it in reliance upon such instructions or upon the opinion of such counsel. The Bank, its agents and subcontractors shall be protected and indemnified in acting upon any paper or document, reasonably believed to be genuine and to have been signed by the proper person or persons, or upon any instruction, information, data, records or documents provided the Bank or its agents or subcontractors by machine readable input, telex, CRT data entry or other similar means authorized by the Trust, and shall not be held to have notice of any change of authority of any person, until receipt of written notice thereof from the Trust.

6.3 In order that the indemnification provisions contained in this Section 6 shall apply, upon the assertion of a claim for which the Trust may be required to indemnify the Bank, the Bank shall promptly notify the Trust of such assertion, and shall keep the Trust advised with respect to all developments concerning such claim. The Trust shall have the option to participate with the Bank in the defense of such claim or to defend against said claim in its own name or in the name of the Bank. The Bank shall in no case confess any claim or make any compromise in any case in which the Trust may be required to indemnify the Bank except with the Trust's prior written consent.

7. Standard of Care

The Bank shall at all times act in good faith and agrees to use its best efforts within reasonable limits to insure the accuracy of all services performed under this Agreement, but assumes no responsibility and shall not be liable for loss or damage due to errors

6

unless said errors are caused by its negligence, bad faith, or willful misconduct or that of its employees.

8. Covenants of the Trust and the Bank

8.1 The Trust shall on behalf of each of the Funds promptly furnish to the Bank the following:

(a) A certified copy of the resolution of the Board of Trustees of the Trust authorizing the appointment of the Bank and the execution and delivery of this Agreement.

(b) A copy of the Declaration of Trust and By-Laws of the Trust and all amendments thereto.

8.2 The Bank shall keep records relating to the services to be performed hereunder, in the form and manner as it may deem advisable. To the extent required by Section 31 of the Investment Company Act of 1940, as amended, and the Rules thereunder, the Bank agrees that all such records prepared or maintained by the Bank relating to the services to be performed by the Bank hereunder are the property of the Trust and will be preserved, maintained and made available in accordance with such Section and Rules, and will be surrendered promptly to the Trust on and in accordance with its request.

8.3 The Bank and the Trust agree that all books, records, information and data pertaining to the business of the other party which are exchanged or received pursuant to the negotiation or the carrying out of this Agreement shall remain confidential, and shall not be voluntarily disclosed to any other person, except as may be required by law.

8.4 In case of any requests or demands for the inspection of the Shareholder records of the Trust, the Bank will endeavor to notify the Trust and to secure instructions from an authorized officer of the Trust as to such inspection. The Bank reserves the right, however, to exhibit the Shareholder records to any person whenever it is advised by its counsel that it may be held liable for the failure to exhibit the Shareholder records to such person.

9. Termination of Agreement

9.1 This Agreement may be terminated by either party upon thirty (30) days written notice to the other.

9.2 Should the Trust terminate the Administration Agreement, the Bank shall have the right to terminate this Agreement. Such termination shall become effective concurrently with the effective termination of the Administration Agreement.

9.3 Should the Trust exercise its right to terminate, all out-of-pocket expenses associated with the movement of records and material will be borne by the Trust on behalf of the applicable Fund(s). Additionally, the Bank reserves the right to charge for any other

7

      reasonable expenses associated with such termination and/or a charge
      equivalent to the average of three (3) months' fees.

10.   Additional Series

      In the event that the Trust establishes one or more series in addition to
      the Funds with respect to which it desires to have the Bank render
      services as transfer agent under the terms hereof, it shall so notify the
      Bank in writing, and if the Bank agrees in writing to provide such
      services, such series shall become a Fund hereunder.

11.   Assignment

11.1  Except as provided in Section 11.3 below, neither this Agreement nor any
      rights or obligations hereunder may be assigned by either party without
      the written consent of the other party.

11.2  This Agreement shall inure to the benefit of and be binding upon the
      parties and their respective permitted successors and assigns.

11.3  The Bank may, without further consent on the part of the Trust,
      subcontract for the performance, in whole or in part, of this Agreement
      with (i) Boston Financial Data Services, Inc., a Massachusetts corporation
      ("BFDS") which is duly registered as a transfer agent pursuant to Section
      17A(c)(2) of the Securities Exchange Act of 1934, as amended ("Section
      17A(c)(2)"), (ii) a BFDS subsidiary duly registered as a transfer agent
      pursuant to Section 17A(c)(2), (iii) a BFDS affiliate or (iv) Boston
      EquiServe Trust Company, N.A.; provided, however, that the Bank shall be
      as fully responsible to the Trust for the acts and omissions of any
      subcontractor as it is for its own acts and omissions.

12.   Amendment

      This Agreement may be amended or modified by a written agreement executed
      by both parties and authorized or approved by a resolution of the Board of
      Trustees of the Trust.

13.   Massachusetts Law to Apply

      This Agreement shall be construed and the provisions thereof interpreted
      under and in accordance with the laws of The Commonwealth of
      Massachusetts.

14.   Force Majeure

      In the event either party is unable to perform its obligations under the
      terms of this Agreement because of acts of God, strikes, equipment or
      transmission failure or damage reasonably beyond its control, or other
      causes reasonably beyond its control, such party

8

shall not be liable for damages to the other for any damages resulting from such failure to perform or otherwise from such causes.

15. Special, Indirect and Consequential Damages

Neither party to this Agreement shall be liable to the other party for any special, indirect, incidental, or consequential damages of any kind whatsoever (including, without limitation, attorneys' fees) under any provision of this Agreement or for any such damages arising out of any act or failure to act hereunder. In any event, the Bank's liability under this Agreement shall be limited to two times its total annual compensation earned and fees paid hereunder during the preceding twelve months for any liability or loss suffered by the Trust.

16. Merger of Agreement

This Agreement constitutes the entire agreement between the parties hereto and supersedes any prior agreement with respect to the subject matter hereof whether oral or written.

17. Limitations of Liability of the Trustees and Shareholders

A copy of the Declaration of Trust of the Trust is on file with the Secretary of The Commonwealth of Massachusetts, and notice is hereby given that this instrument is executed on behalf of the Trustees of the Trust as Trustees and not individually and that the obligations of this instrument are not binding upon any of the Trustees or Shareholders individually but are binding only upon the assets and property of the Trust.

18. Counterparts

This Agreement may be executed by the parties hereto on any number of counterparts, and all of said counterparts taken together shall be deemed to constitute one and the same instrument.

19. Reproduction of Documents

This Agreement and all schedules, exhibits, attachments and amendments hereto may be reproduced by any photographic, photostatic, microfilm, micro-card, miniature photographic or other similar process. The parties hereto all/each agree that any such reproduction shall be admissible in evidence as the original itself in any judicial or administrative proceeding, whether or not the original is in existence and whether or not such reproduction was made by a party in the regular course of business, and that any enlargement, facsimile or further reproduction of such reproduction shall likewise be admissible in evidence.

9

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed in their names and on their behalf by and through their duly authorized officers, as of the day and year first above written.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

                             BY: /s/Kathleen C. Cuocolo
                                 ----------------------


ATTEST:

STATE STREET BANK AND TRUST COMPANY

                             BY: /s/ Michelle Loranger
                                 ---------------------
                                 Michelle Loranger
                                 Executive Vice President


ATTEST:  /s/Kelly Powers
         ---------------
           Kelly Powers

10

ANNEX A

State Street Equity 500 Index Fund
State Street Equity 2000 Index Fund
State Street Equity 400 Index Fund
State Street MSCI(R) EAFE(R) Index Fund
State Street Aggregate Bond Index Fund

Dated:

11

EXHIBIT C

As consideration for State Street Bank and Trust Company's services as administrator, custodian and transfer agent to each of the following Funds and such other services as the parties may from time to time agree and for State Street's assumption of ordinary operating expenses of the Funds, State Street shall receive from each Fund an annual administrative fee, accrued daily at the rate of 1/365th of the applicable fee rate of the following annual percentages of the Fund's average daily net assets during the month:

                                                        Annual percentage of
                  Fund                                  average daily net assets
                  ----                                  ------------------------
STATE STREET EQUITY 500 INDEX FUND                      .05%
      -  CLASS A SHARES
STATE STREET EQUITY 500 INDEX FUND                      .05%
      -  CLASS B SHARES
STATE STREET EQUITY 400 INDEX FUND                      .10%
STATE STREET EQUITY 2000 INDEX FUND                     .10%
STATE STREET MSCI(R) EAFE(R) INDEX FUND                 .10%
STATE STREET AGGREGATE BOND INDEX FUND                  .10%
STATE STREET MONEY MARKET FUND                          .05%
STATE STREET U.S. GOVERNMENT MONEY
MARKET FUND                                             .05%

12

Exhibit 99.(h)(2)

ADMINISTRATION AGREEMENT

Agreement dated as of February 28, 2000 by and between State Street Bank and Trust Company, a Massachusetts trust company (the "Administrator"), and State Street Institutional Investment Trust (the "Trust").

WHEREAS, the Trust is registered as an open-end, management investment company under the Investment Company Act of 1940, as amended (the "1940 Act"); and

WHEREAS, the Trust desires to retain the Administrator to furnish certain administrative services to the Trust, and the Administrator is willing to furnish such services, on the terms and conditions hereinafter set forth.

NOW, THEREFORE, in consideration of the premises and mutual covenants herein contained, the parties hereto agree as follows:

1. APPOINTMENT OF ADMINISTRATOR

The Trust hereby appoints the Administrator to act as administrator with respect to the Trust for purposes of providing certain administrative services for the period and on the terms set forth in this Agreement. The Administrator accepts such appointment and agrees to render the services stated herein.

The Trust will initially consist of the Funds listed in Schedule A to this Agreement. In the event that the Trust establishes one or more additional Funds with respect to which it wishes to retain the Administrator to act as administrator hereunder, the Trust shall notify the Administrator in writing. Upon written acceptance by the Administrator, such Fund shall become subject to the provisions of this Agreement to the same extent as the existing Funds, except to the extent that such provisions (including those relating to the compensation and expenses payable by the Trust and its Funds) may be modified with respect to each additional Fund in writing by the Trust and the Administrator at the time of the addition of the Fund.

2. DELIVERY OF DOCUMENTS

The Trust will promptly deliver to the Administrator copies of each of the following documents and all future amendments and supplements, if any:

a. The Trust's Declaration of Trust;

b. The Trust's currently effective registration statement under the 1940 Act and the Trust's Prospectus(es) and Statement(s) of Additional Information

- 1 -

relating to all Funds and all amendments and supplements thereto as in effect from time to time;

c. Certified copies of the resolutions of the Board of Trustees of the Trust (the "Board") authorizing (1) the Trust to enter into this Agreement and (2) certain individuals on behalf of the Trust to (a) give instructions to the Administrator pursuant to this Agreement and (b) sign checks and pay expenses;

d. A copy of the investment advisory agreement between the Trust and its investment adviser;

e. A copy of the distribution agreement between the Trust and its distributor; and

f. Such other certificates, documents or opinions which the Administrator may, in its reasonable discretion, deem necessary or appropriate in the proper performance of its duties.

3. REPRESENTATIONS AND WARRANTIES OF THE ADMINISTRATOR

The Administrator represents and warrants to the Trust that:

a. It is a Massachusetts trust company, duly organized and existing under the laws of The Commonwealth of Massachusetts;

b. It has the corporate power and authority to carry on its business in The Commonwealth of Massachusetts;

c. All requisite corporate proceedings have been taken to authorize it to enter into and perform this Agreement;

d. No legal or administrative proceedings have been instituted or threatened which would materially impair the Administrator's ability to perform its duties and obligations under this Agreement; and

e. Its entrance into this Agreement shall not cause a material breach or be in material conflict with any other agreement or obligation of the Administrator or any law or regulation applicable to it.

4. REPRESENTATIONS AND WARRANTIES OF THE TRUST

The Trust represents and warrants to the Administrator that:

a. It is a business trust, duly organized, existing and in good standing under the laws of The Commonwealth of Massachusetts;

- 2 -

b. It has the corporate power and authority under applicable laws and by its Declaration of Trust and by-laws to enter into and perform this Agreement;

c. All requisite proceedings have been taken to authorize it to enter into and perform this Agreement;

d. It is an investment company properly registered under the 1940 Act;

e. A registration statement under the 1940 Act has been filed and will be effective and remain effective during the term of this Agreement. The Trust also warrants to the Administrator that as of the effective date of this Agreement, all necessary filings under the securities laws of the states in which the Trust offers or sells its shares have been made;

f. No legal or administrative proceedings have been instituted or threatened which would materially impair the Trust's ability to perform its duties and obligations under this Agreement;

g. Its entrance into this Agreement will not cause a material breach or be in material conflict with any other agreement or obligation of the Trust or any law or regulation applicable to it; and

h. As of the close of business on the date of this Agreement, the Trust is authorized to issue shares of beneficial interest, and it will initially offer shares, in the authorized amounts as set forth in Schedule A to this Agreement.

5. ADMINISTRATION SERVICES

The Administrator shall provide the following services, in each case, subject to the control, supervision and direction of the Trust and the review and comment by the Trust's auditors and legal counsel and in accordance with procedures which may be established from time to time between the Trust and the Administrator:

a. Oversee the determination and publication of the Trust's net asset value in accordance with the Trust's policy as adopted from time to time by the Board;

b. Oversee the maintenance by the Trust's custodian of certain books and records of the Trust as required under Rule 31a-1(b) of the 1940 Act;

c. Prepare the Trust's federal, state and local income tax returns for review by the Trust's independent accountants and filing by the Trust's treasurer;

- 3 -

d. Review calculation, submit for approval by officers of the Trust and arrange for payment of the Trust's expenses;

e. Prepare for review and approval by officers of the Trust financial information for the Trust's semi-annual and annual reports, proxy statements and other communications required or otherwise to be sent to Trust interest holders, and arrange for the printing and dissemination of such reports and communications to record and beneficial shareholders through The Depository Trust Company;

f. Prepare for review by an officer of the Trust the Trust's periodic financial reports required to be filed with the Securities and Exchange Commission ("SEC") on Form N-SAR and financial information required by Form N-1A and such other reports, forms or filings as may be mutually agreed upon;

g. Prepare reports relating to the business and affairs of the Trust as may be mutually agreed upon and not otherwise prepared by the Trust's investment adviser, custodian, legal counsel or independent accountants;

h. Prepare recommendations as to each Fund's income and capital gains available for distribution; calculate such distributions for each Fund in accordance with applicable regulations and the distribution policies set forth in the Trust's registration statement, and assist Trust management in making final determination of distribution amounts;

i. Make such reports and recommendations to the Board concerning the performance of the independent accountants as the Board may reasonably request;

j. Make such reports and recommendations to the Board concerning the performance and fees of the Trust's custodian and transfer and dividend disbursing agent ("Transfer Agent") as the Board may reasonably request or deems appropriate;

k. Oversee and review calculations of fees paid to the Trust's investment adviser, custodian and Transfer Agent;

l. Consult with the Trust's officers, independent accountants, legal counsel, custodian and Transfer Agent in establishing the accounting policies of the Trust;

m. Respond to, or refer to the Trust's officers or the Distributor or the Transfer Agent, shareholder inquiries relating to the Trust;

- 4 -

n. Provide periodic testing of portfolios to assist the Trust's investment adviser in complying with Internal Revenue Code mandatory qualification requirements, the requirements of the 1940 Act and Trust prospectus limitations as may be mutually agreed upon;

o. Review and provide assistance on shareholder communications;

p. Maintain general corporate calendar;

q. Maintain copies of the Trust's Declaration of Trust and by-laws;

r. File annual and semi-annual interest holder reports with the appropriate regulatory agencies; review text of "President's letters" to interest holders and "Management's Discussion of Trust Performance" (which shall also be subject to review by the Trust's legal counsel);

s. Organize, attend and prepare minutes of shareholder meetings;

t. Provide consultation on regulatory matters relating to portfolio management, Trust operations and any potential changes in the Trust's investment policies, operations or structure; act as liaison to legal counsel to the Trust and, where applicable, to legal counsel to the Trust's independent Board members;

u. Maintain continuing awareness of significant emerging regulatory and legislative developments which may affect the Trust, update the Board and the investment adviser on those developments and provide related planning assistance where requested or appropriate;

v. Develop or assist in developing guidelines and procedures to improve overall compliance by the Trust and its various agents;

w. Counsel and assist the Trust in the handling of routine regulatory examinations and work closely with the Trust's legal counsel in response to any non-routine regulatory matters;

Subject to review and comment by the Trust's legal counsel:

x. Prepare and file with the SEC amendments to the Trust's registration statement, including updating the Prospectus and Statement of Additional Information, where applicable;

y. Prepare and file with the SEC proxy statements; provide consultation on proxy solicitation matters;

- 5 -

z. Prepare agenda and background materials for Board meetings, make presentations where appropriate, prepare minutes and address follow-up on matters raised at Board meetings;

aa. Prepare and file with the SEC Rule 24f-2 notices; and

bb. Perform Blue Sky services pursuant to the specific instructions of the Trust and as detailed in Schedule B to this Agreement.

The Administrator shall provide the office facilities and the personnel required by it to perform the services contemplated herein.

6. FEES; EXPENSES; EXPENSE REIMBURSEMENT

The Administrator shall receive from the Trust such compensation for the Administrator's services provided pursuant to this Agreement as may be agreed to from time to time in a written fee schedule approved by the parties and described in the then current Prospectus and initially as set forth on Schedule C to this Agreement. The fees are accrued daily and billed monthly and shall be due and payable upon receipt of the invoice. Upon the termination of this Agreement before the end of any month, the fee for the part of the month before such termination shall be prorated according to the proportion which such part bears to the full monthly period and shall be payable upon the date of termination of this Agreement. In addition, the Trust shall reimburse the Administrator for its out-of-pocket costs incurred in connection with this Agreement.

The Administrator shall bear all ordinary operating expenses of each Fund, including ordinary legal and audit expenses. However, should a Fund cease to invest substantially all of its assets in the corresponding Portfolio of the State Street Master Funds then such Fund of the Trust shall bear all expenses that are incurred in its operation. Such expenses will include, but are not limited to: organizational expenses; cost of services of independent accountants and outside legal and tax counsel (including such counsel's review of the Trust's registration statement, proxy materials, federal and state tax qualification as a regulated investment company and other reports and materials prepared by the Administrator under this Agreement); cost of any services contracted for by the Trust directly from parties other than the Administrator; cost of trading operations and brokerage fees, commissions and transfer taxes in connection with the purchase and sale of securities for the Trust; investment advisory fees; taxes, insurance premiums and other fees and expenses applicable to its operation; costs incidental to any meetings of shareholders including, but not limited to, legal and accounting fees, proxy filing fees and the costs of preparation, printing and mailing of any proxy materials; costs incidental to Board meetings, including fees and expenses of Board members; the salary and expenses of any officer, director\trustee or employee of the Trust; costs incidental to the preparation, printing and distribution of the Trust's registration statements and any amendments thereto and shareholder reports; cost of typesetting and printing of prospectuses; cost of preparation and filing of the Trust's tax returns, Form N-1A and Form N-SAR, and all notices, registrations and amendments associated with applicable

- 6 -

federal and state tax and securities laws; all applicable registration fees and filing fees required under federal and state securities laws; fidelity bond and directors' and officers' liability insurance; and cost of independent pricing services used in computing the Trust's net asset value. The Trust agrees promptly to reimburse the Administrator for any extraordinary expenses that the Administrator may incur on the Trust's behalf at the Trust's request or with the Trust's consent.

The Administrator is authorized to and may employ or associate with such person or persons as the Administrator may deem desirable to assist it in performing its duties under this Agreement; provided, however, that the compensation of such person or persons shall be paid by the Administrator and that the Administrator shall be as fully responsible to the Trust for the acts and omissions of any such person or persons as it is for its own acts and omissions.

7. INSTRUCTIONS AND ADVICE

At any time, the Administrator may apply to any officer of the Trust for instructions and may consult with its own legal counsel or outside counsel for the Trust or the independent accountants for the Trust at the expense of the Trust, with respect to any matter arising in connection with the services to be performed by the Administrator under this Agreement. The Administrator shall not be liable, and shall be indemnified by the Trust, for any action taken or omitted by it in good faith in reliance upon any such instructions or advice or upon any paper or document believed by it to be genuine and to have been signed by the proper person or persons. The Administrator shall not be held to have notice of any change of authority of any person until receipt of written notice thereof from the Trust. Nothing in this paragraph shall be construed as imposing upon the Administrator any obligation to seek such instructions or advice, or to act in accordance with such advice when received.

8. LIMITATION OF LIABILITY AND INDEMNIFICATION

The Administrator shall be responsible for the performance of only such duties as are set forth in this Agreement and, except as otherwise provided under Section 6, shall have no responsibility for the actions or activities of any other party, including other service providers. The Administrator shall have no liability for any error of judgment or mistake of law or for any loss or damage resulting from the performance or nonperformance of its duties hereunder unless solely caused by or resulting from the gross negligence or willful misconduct of the Administrator, its officers or employees. The Administrator shall not be liable for any special, indirect, incidental, or consequential damages of any kind whatsoever (including, without limitation, attorneys' fees) under any provision of this Agreement or for any such damages arising out of any act or failure to act hereunder. In any event, the Administrator's liability under this Agreement shall be limited to two times its total annual compensation earned and fees paid hereunder during the preceding twelve months for any liability or loss suffered by the Trust including, but not limited to, any liability relating to qualification of the Trust as a regulated investment

- 7 -

company or any liability relating to the Trust's compliance with any federal or state tax or securities statute, regulation or ruling.

The Administrator shall not be responsible or liable for any failure or delay in performance of its obligations under this Agreement arising out of or caused, directly or indirectly, by circumstances beyond its control, including without limitation, work stoppage, power or other mechanical failure, computer virus, natural disaster, governmental action or communication disruption.

The Trust shall indemnify and hold the Administrator harmless from all loss, cost, damage and expense, including reasonable fees and expenses for counsel, incurred by the Administrator resulting from any claim, demand, action or suit in connection with the Administrator's acceptance of this Agreement, any action or omission by it in the performance of its duties hereunder, or as a result of acting upon any instructions reasonably believed by it to have been duly authorized by the Trust, provided that this indemnification shall not apply to actions or omissions of the Administrator, its officers or employees in cases of its or their own gross negligence or willful misconduct.

The indemnification contained herein shall survive the termination of this Agreement.

9. CONFIDENTIALITY

The Administrator agrees that, except as otherwise required by law or in connection with any required disclosure to a banking or other regulatory authority, it will keep confidential all records and information in its possession relating to the Trust or its shareholders or shareholder accounts and will not disclose the same to any person except at the request or with the written consent of the Trust.

10. COMPLIANCE WITH GOVERNMENTAL RULES AND REGULATIONS; RECORDS

The Trust assumes full responsibility for complying with all securities, tax, commodities and other laws, rules and regulations applicable to it.

In compliance with the requirements of Rule 31a-3 under the 1940 Act, the Administrator agrees that all records which it maintains for the Trust shall at all times remain the property of the Trust, shall be readily accessible during normal business hours, and shall be promptly surrendered upon the termination of the Agreement or otherwise on written request. The Administrator further agrees that all records which it maintains for the Trust pursuant to Rule 31a-1 under the 1940 Act will be preserved for the periods prescribed by Rule 31a-2 under the 1940 Act unless any such records are earlier surrendered as provided above. Records shall be surrendered in usable machine-readable form.

- 8 -

11. SERVICES NOT EXCLUSIVE

The services of the Administrator to the Trust are not to be deemed exclusive, and the Administrator shall be free to render similar services to others. The Administrator shall be deemed to be an independent contractor and shall, unless otherwise expressly provided herein or authorized by the Trust from time to time, have no authority to act or represent the Trust in any way or otherwise be deemed an agent of the Trust.

12. TERM, TERMINATION AND AMENDMENT

This Agreement shall become effective on the date of its execution and shall remain in full force and effect from the effective date for an initial term of two years from the effective date and shall automatically continue in full force and effect after such initial term unless either party terminates this Agreement by written notice to the other party at least sixty (60) days prior to the expiration of the initial term. Either party may terminate this Agreement at any time after the initial term upon at least sixty (60) days' prior written notice to the other party. Termination of this Agreement with respect to any given Fund shall in no way affect the continued validity of this Agreement with respect to any other Fund. Upon termination of this Agreement, the Trust shall pay to the Administrator such compensation and any reimbursable expenses as may be due under the terms hereof as of the date of such termination, including reasonable out-of-pocket expenses associated with such termination. This Agreement may be modified or amended from time to time by mutual written agreement of the parties hereto.

13. NOTICES

Any notice or other communication authorized or required by this Agreement to be given to either party shall be in writing and deemed to have been given when delivered in person or by confirmed facsimile, or posted by certified mail, return receipt requested, to the following address (or such other address as a party may specify by written notice to the other): if to the Trust: P.O. Box 1713, Boston, MA 02105-1713, Attn: Julie Tedesco, fax: 617-662-3805; if to the Administrator: State Street Bank and Trust Company, 2 Avenue De Lafayette, Boston, Massachusetts 02111, Attn: Fund Administration Legal Department, fax:
617-537-2578.

14. NON-ASSIGNABILITY

This Agreement shall not be assigned by either party hereto without the prior consent in writing of the other party, except that the Administrator may assign this Agreement to a successor of all or a substantial portion of its business, or to a party controlling, controlled by or under common control with the Administrator.

- 9 -

15. SUCCESSORS

This Agreement shall be binding on and shall inure to the benefit of the Trust and the Administrator and their respective successors and permitted assigns.

16. ENTIRE AGREEMENT

This Agreement contains the entire understanding between the parties hereto with respect to the subject matter hereof and supersedes all previous representations, warranties or commitments regarding the services to be performed hereunder whether oral or in writing.

17. WAIVER

The failure of a party to insist upon strict adherence to any term of this Agreement on any occasion shall not be considered a waiver nor shall it deprive such party of the right thereafter to insist upon strict adherence to that term or any term of this Agreement. Any waiver must be in writing signed by the waiving party.

18. SEVERABILITY

If any provision of this Agreement is invalid or unenforceable, the balance of the Agreement shall remain in effect, and if any provision is inapplicable to any person or circumstance it shall nevertheless remain applicable to all other persons and circumstances.

19. GOVERNING LAW

This Agreement shall be construed and the provisions thereof interpreted under and in accordance with the laws of The Commonwealth of Massachusetts.

20. REPRODUCTION OF DOCUMENTS

This Agreement and all schedules, exhibits, attachments and amendments hereto may be reproduced by any photographic, photostatic, microfilm, micro-card, miniature photographic or other similar process. The parties hereto all/each agree that any such reproduction shall be admissible in evidence as the original itself in any judicial or administrative proceeding, whether or not the original is in existence and whether or not such reproduction was made by a party in the regular course of business, and that any enlargement, facsimile or further reproduction of such reproduction shall likewise be admissible in evidence.

- 10 -

21. LIMITATION OF LIABILITY

The Declaration of Trust dated February 16, 2000, establishing the Trust, which is hereby referred to and a copy of which is on file with the Secretary of The Commonwealth of Massachusetts, provides that the name State Street Institutional Investment Trust means the Trustees from time to time serving (as Trustees but not personally) under such Declaration of Trust. It is expressly acknowledged and agreed that the obligations of the Trust hereunder shall not be binding upon any of the shareholders, Trustees, officers, employees or agents of the Trust, personally, but shall bind only the trust property of the Trust, as provided in its Declaration of Trust. The execution and delivery of this Agreement have been authorized by the Trustees of the Trust and signed by an officer of the Trust, acting as such, and neither such authorization by such Trustees nor such execution and delivery by such officer shall be deemed to have been made by any of them individually or to impose any liability on any of them personally, but shall bind only the trust property of the Trust as provided in its Declaration of Trust.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their officers designated below as of the date first written above.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

By:   /s/James B. Little
      ------------------

Name:   James B. Little

Title:  Treasurer

STATE STREET BANK AND TRUST COMPANY

By:  /s/Kathleen C. Cuocolo
     ----------------------

Name:  Kathleen C. Cuocolo

Title: Executive Vice President

- 11 -

ADMINISTRATION AGREEMENT

SCHEDULE A
LISTING OF FUNDS AND AUTHORIZED SHARES

FUND                                        AUTHORIZED SHARES
----                                        -----------------
State Street Equity 500 Index Fund              Unlimited

State Street Equity 2000 Index Fund             Unlimited

State Street Equity 400 Index Fund              Unlimited

State Street MSCI(R) EAFE(R) Index Fund         Unlimited

State Street Aggregate Bond Index Fund          Unlimited

- 12 -

ADMINISTRATION AGREEMENT

SCHEDULE B
NOTICE FILING WITH
STATE SECURITIES ADMINISTRATORS

AT THE SPECIFIC DIRECTION OF THE TRUST, THE ADMINISTRATOR WILL PREPARE REQUIRED DOCUMENTATION AND MAKE NOTICE FILINGS IN ACCORDANCE WITH THE SECURITIES LAWS OF EACH JURISDICTION IN WHICH TRUST SHARES ARE TO BE OFFERED OR SOLD PURSUANT TO INSTRUCTIONS GIVEN TO THE ADMINISTRATOR BY THE TRUST.

THE TRUST SHALL BE SOLELY RESPONSIBLE FOR THE DETERMINATION (I) OF THOSE JURISDICTIONS IN WHICH NOTICE FILINGS ARE TO BE SUBMITTED AND (II) THE NUMBER OF TRUST SHARES TO BE PERMITTED TO BE SOLD IN EACH SUCH JURISDICTION. IN THE EVENT THAT THE ADMINISTRATOR BECOMES AWARE OF (A) THE SALE OF TRUST SHARES IN A JURISDICTION IN WHICH NO NOTICE FILING HAS BEEN MADE OR (B) THE SALE OF TRUST SHARES IN EXCESS OF THE NUMBER OF TRUST SHARES PERMITTED TO BE SOLD IN SUCH JURISDICTION, THE ADMINISTRATOR SHALL REPORT SUCH INFORMATION TO THE TRUST, AND IT SHALL BE THE TRUST'S RESPONSIBILITY TO DETERMINE APPROPRIATE CORRECTIVE ACTION AND INSTRUCT THE ADMINISTRATOR WITH RESPECT THERETO.

The Blue Sky services shall consist of the following:

1. Filing of Trust's Initial Notice Filings, as directed by the Trust;

2. Filing of Trust's renewals and amendments as required;

3. Filing of amendments to the Trust's registration statement where required;

4. Filing Trust sales reports where required;

5. Payment at the expense of the Trust of all Trust Notice Filing fees;

6. Filing the Prospectuses and Statements of Additional Information and any amendments or supplements thereto where required;

7. Filing of annual reports and proxy statements where required; and

8. The performance of such additional services as the Administrator and the Trust may agree upon in writing.

- 13 -

Unless otherwise specified in writing by the Administrator, Blue Sky services by the Administrator shall not include determining the availability of exemptions under a jurisdiction's blue sky law. Any such determination shall be made by the Trust or its legal counsel. In connection with the services described herein, the Trust shall issue in favor of the Administrator a power of attorney to submit Notice Filings on behalf of the Trust, which power of attorney shall be substantially in the form of Exhibit I attached hereto.

- 14 -

EXHIBIT C

As consideration for State Street Bank and Trust Company's services as administrator, custodian and transfer agent to each of the following Funds and such other services as the parties may from time to time agree and for State Street's assumption of ordinary operating expenses of the Funds, State Street shall receive from each Fund an annual administrative fee, accrued daily at the rate of 1/365th of the applicable fee rate of the following annual percentages of the Fund's average daily net assets during the month:

                                                        Annual percentage of
                  Fund                                  average daily net assets
                  ----                                  ------------------------
STATE STREET EQUITY 500 INDEX FUND                      .05%
      -  CLASS A SHARES
STATE STREET EQUITY 500 INDEX FUND                      .05%
      -  CLASS B SHARES
STATE STREET EQUITY 400 INDEX FUND                      .10%
STATE STREET EQUITY 2000 INDEX FUND                     .10%
STATE STREET MSCI(R) EAFE(R) INDEX FUND                 .10%
STATE STREET AGGREGATE BOND INDEX FUND                  .10%
STATE STREET MONEY MARKET FUND                          .05%
STATE STREET U.S. GOVERNMENT MONEY
MARKET FUND                                             .05%

- 15 -

EXHIBIT I

LIMITED POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, as of _____________________, that State Street Institutional Investment Trust with principal offices at 225 Franklin Street, Boston, Massachusetts 02110 (the "Trust") makes, constitutes, and appoints STATE STREET BANK AND TRUST COMPANY (the "Administrator") with principal offices at 225 Franklin Street, Boston, Massachusetts its lawful attorney-in-fact for it to do as if it were itself acting, the following:

1. REGISTRATION OF TRUST SHARES. The power to register shares of each series of the Trust in each jurisdiction in which each series of Trust shares are offered or sold and in connection therewith the power to prepare, execute, and deliver and file any and all Trust applications, including without limitation, applications to register shares, consents, including consents to service of process, reports, including without limitation, all periodic reports, claims for exemption, or other documents and instruments now or hereafter required or appropriate in the judgment of the Administrator in connection with the registration of Trust shares.

2. AUTHORIZED SIGNERS. Pursuant to this Limited Power of Attorney, individuals holding the titles of Officer, Blue Sky Manager, or Senior Blue Sky Administrator at the Administrator shall have authority to act on behalf of the Trust with respect to item 1 above.

The execution of this limited power of attorney shall be deemed coupled with an interest and shall be revocable only upon receipt by the Administrator of such termination of authority. Nothing herein shall be construed to constitute the appointment of the Administrator as or otherwise authorize the Administrator to act as an officer, director or employee of the Trust.

IN WITNESS WHEREOF, the Trust has caused this Agreement to be executed in its name and on its behalf by and through its duly authorized officer, as of the date first written above.

By: ______________________________

Name: ____________________________

Title: ___________________________

- 16 -

Exhibit (j)(4)

CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Financial Highlights" in the Prospectus and "Counsel and Independent Auditors" in the Statement of Additional Information and to the use of our reports dated February 8, 2002, with respect to the financial statements of the State Street Equity 500 Index Fund and State Street Equity 500 Index Portfolio, included in the State Street Equity 500 Index Fund Annual Report dated December 31, 2001 that is incorporated by reference into this Post-Effective Amendment No. 10 to the Registration Statement (Form N-1A, No. 33-30810) of State Street Institutional Investment Trust.

ERNST & YOUNG LLP

Boston, Massachusetts
April 25, 2002


Exhibit 99(m)

RULE 12b-1 PLAN
State Street Institutional Investment Trust

1. The Trust. The State Street Institutional Investment Trust (the "Trust") is an open-end management investment company registered as such under the Investment Company Act of 1940, as amended (the "1940 Act"), and organized as a series trust (each such series is referred to herein as a "Fund").

2. The Plan. The Trust desires to adopt a plan of distribution pursuant to Rule 12b-1 under the 1940 Act with respect to the shares of beneficial interest ("Shares") of each Fund, and the Board of Trustees of the Trust (the "Board of Trustees") has determined that there is a reasonable likelihood that adoption of this Rule 12b-1 Plan (the "Plan") will benefit each State Street Institutional Investment Fund (each a "Designated Fund" and collectively the "Designated Funds") and their holders of Shares. Accordingly, each Designated Fund hereby adopts this Plan in accordance with Rule 12b-1 under the 1940 Act on the following terms and conditions (capitalized terms not otherwise defined herein have the meanings assigned thereto in the Funds' registration statement under the 1940 Act and under the Securities Act of 1933, as amended, as such registration statement is amended by any amendments thereto at the time in effect).

3. The Distributor. The Trust has entered into a written Distribution Agreement with ALPS Mutual Funds Services, Inc. (the "Distributor"), pursuant to which the Distributor will act as the exclusive distributor with respect to the distribution of Shares as described in the Funds' registration statement of each Fund.

4. Payments. Each Designated Fund may pay fees pursuant to this Plan at annual rates as may hereafter be determined by the Board of Trustees, which rates shall not exceed the rates set forth on Exhibit A attached hereto. All agreements related to this Plan shall be in writing and shall provide: (A) that such agreement may be terminated at any time, without payment of any penalty, by vote of a majority of Trustees who are not "interested persons" of the Trust (as defined in the 1940 Act) and who have no direct or indirect financial interest in the operator of this Plan or in any agreement related to this Plan (the "Independent Trustees") or by a vote of a majority of the outstanding voting securities (as defined in the 1940 Act) of the Designated Fund, on not more than 60 days' written notice to any other party to the agreement, and (B) that such agreement shall terminate automatically in the event of its assignment (as defined in the 1940 Act).

5. Effective Date. This Plan shall become effective upon approval by a vote of both a majority of the Board of Trustees and a majority of the Independent Trustees, cast in person at a meeting called for the purpose of voting on this Plan.

6. Term. This Plan shall, unless terminated as hereinafter provided, remain in effect with respect to the Designated Fund for one year from its effective date and shall continue thereafter, provided that its continuance is specifically approved at least annually by a vote of both a majority of the Trustees and a majority of Independent Trustees, cast in person at a meeting called for the purpose of voting on this Plan.


7. Amendment. This Plan may be amended at any time by the Board of Trustees, provided that (a) any amendment to increase materially the rate at which payments may be made by a Designated Fund under this Plan shall be effective only upon approval by a vote of a majority of the outstanding voting securities (as such term is defined in the 1940 Act) of the Designated Fund, and (b) any material amendment of this Plan shall be effective only upon approval by a vote of both a majority of the Board of Trustees and a majority of the Independent Trustees, cast in person at a meeting called for the purpose of voting on such amendment.

8. Termination. This Plan may be terminated at any time, without payment of any penalty, by vote of a majority of the Independent Trustees, or by vote of a majority of the outstanding voting securities (as such term is defined in the 1940 Act) of the Designated Fund. In the event of termination or non-continuance of this Plan, the Trust may reimburse any expense that it incurred prior to such termination or non-continuance, provided that such reimbursement is specifically approved by both a majority of the Board of Trustees and a majority of the Independent Trustees.

9. Reports. While this Plan is in effect, the Distributor shall provide to the Trustees, and the Trustees shall review, at least quarterly, a written report of the amounts expended pursuant to the Plan and the purposes for which such expenditures were made.

10. Records. The Trust shall preserve copies of this Plan, each agreement related hereto and each report referred to in paragraph 9 hereof for a period of at least six years from the date of the Plan, agreement and report, the first two years in an easily accessible place.

11. Independent Trustees. While this Plan is in effect, the selection and nomination of Independent Trustees shall be committed to the discretion of the Trustees who are not "interested persons" of the Trust (as defined in the 1940 Act).

12. Severability. If any provision of the Plan shall be held or made invalid by a court decision, statute, rule or otherwise, the remainder of the Plan shall not be affected thereby.

Plan adopted February 28, 2000

2

EXHIBIT A

The fees payable to the Distributor under this Plan shall not exceed, with respect to a particular Fund and its classes of shares, if applicable, on an annualized basis, the percentage of such class's average daily net assets set forth below next to the class's name.

FUND AND CLASS                                     FEE LIMITATION
--------------                                     --------------
State Street Equity 500 Index Fund
      Class A                                           0.15%
      Class B                                           0.25%
State Street Equity 400 Index Fund                      0.25%
State Street Equity 2000 Index Fund                     0.25%
State Street MSCI(R) EAFE(R) Index Fund                 0.25%
State Street Aggregate Bond Index Fund                  0.25%
State Street Money Market Fund                          0.05%
State Street U.S. Government Money Market               0.05%
Fund

3