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 SAI 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 Funds and Portfolios described in each Fund’s Prospectus, a Fund or Portfolio may employ other investment practices and may be subject to additional risks, which are described below. In reviewing these practices of the Funds, you should assume that the practices of the corresponding Portfolio are the same in all material respects.

ADDITIONAL INVESTMENTS AND RISKS

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

Cash Reserves

Each Index Portfolio and the Tax Free Portfolio 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 S&P or, if unrated, of comparable quality in the opinion of SSgA Funds Management, Inc. (the “Adviser” or “SSgA FM”); (iii) commercial paper; (iv) bank obligations, including negotiable certificates of deposit, time deposits and bankers’ acceptances; and (v) repurchase agreements. At the time an Index Portfolio 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 Portfolio holds the foregoing instruments its ability to track its corresponding Index may be adversely affected. See Appendix A for more information on the ratings of debt instruments.

Credit Default Swaps

The Limited Duration Bond Portfolio may enter into credit default swap transactions. A credit default swap is an agreement between the Portfolio and a counterparty that enables the Portfolio to buy or sell protection against a credit event related to a specified issuer. One party, acting as a “protection buyer,” make periodic payments to the other party, a “protection seller,” in exchange for a promise by the protection seller to make a payment to the protection buyer if a negative credit event (such as a delinquent payment or default) occurs with respect to a referenced bond or group of bonds. Acting as a protection seller allows the Portfolio to create an investment exposure similar to owning a bond. Acting as a protection buyer allows the Portfolio potentially to reduce its credit exposure to a bond it owns or to take a “short” position in a bond it does not own.

As the protection buyer in a credit default swap, the Limited Duration Bond Portfolio may pay a premium (by means of periodic payments) in return for the right to deliver specified bonds or loans (such as those of a U.S. or foreign issuer or a basket of such issuers) to the protection seller and receive the par (or other agreed-upon) value upon default (or similar events) by the reference issuer. If no default occurs, the protection seller would keep the stream of payments and would have no further obligations to the Limited Duration Bond Portfolio. As the protection buyer, the Portfolio bears the risk that the investment might expire worthless and/or that the protection seller may fail to satisfy its payment obligations to the Portfolio in the event of a default (or similar event). In addition, when the Limited Duration Bond Portfolio is a protection buyer, the Portfolio’s investment would only generate income in the event of an actual default (or similar event) by the issuer of the underlying reference obligation.

The Limited Duration Bond Portfolio may also use credit default swaps for investment purposes by selling a credit default swap, in which case, the Limited Duration Bond Portfolio would be required to pay the par (or other agreed-upon) value of a referenced debt obligation to the protection buyer in the event of a default (or similar event) by the third-party reference issuer. In return for its obligation, the Limited Duration Bond Portfolio would receive from the protection buyer a periodic stream of payments over the term of the contract. If no credit event occurs, the Portfolio would keep the stream of payments and would have no payment obligations. As the protection seller in a credit default swap, the Portfolio effectively adds economic leverage to its portfolio because, in addition to its total net assets, the Portfolio is subject to investment exposure on the notional amount of the swap.

7

Table of Contents

The use of credit default swaps, like all swap agreements, is subject to certain risks, such as counterparty risk, leverage risk, hedging risk, correlation risk and liquidity risk. The Fund will enter into a credit default swap only with counterparties that the Adviser determines to meet certain standards of creditworthiness. If a counterparty’s creditworthiness declines, the value of the swap would likely decline because of the heightened risk that the counterparty may be unable to satisfy its payment obligations (particularly if the counterparty was the protection seller under the credit default swap contract). In addition, there is no guarantee that the Portfolio can eliminate its exposure under an outstanding swap agreement by entering into an offsetting swap agreement with the same or another party.

A Limited Duration Bond Portfolio’s exposure under a credit default swap may be considered leverage and as such be subject to the restrictions on leveraged derivatives.

Futures Contracts and Options on Futures

Each Index Portfolio 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.

Futures 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. Futures contracts are traded in the United States only on commodity exchanges or boards of trade — known as “contract markets” — approved for such trading by the Commodity Futures Trading Commission (the “CFTC”), and must be executed through a futures commission merchant or brokerage firm which is a member of the relevant contract market.

Although many futures contracts by their terms call for actual delivery or acceptance of commodities or securities, in most cases the contracts are closed out before the settlement date without the making or taking of delivery, but rather by entering into an offsetting contract (a “closing transaction”). Upon entering into a futures contract, an Index Portfolio is required to deposit an initial margin with the futures broker. The initial margin serves as a “good faith” deposit that an Index Portfolio will honor its futures commitments. Subsequent payments (called “variation margin” or “maintenance margin”) to and from the broker are made on a daily basis as the price of the underlying security or commodity fluctuates, making the long and short positions in the futures contract more or less valuable, a process known as “marking to the market.” Futures contracts also involve brokerage costs. If the Portfolio is unable to enter into a closing transaction, the amount of the Portfolio’s potential loss may be unlimited.

Each Index Portfolio 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.

The Limited Duration Bond Portfolio may enter into futures contracts on securities in which it may invest and may purchase and write call and put options on such contracts.

Registration under the Commodity Exchange Act. The State Street Equity 500 Index Fund has claimed an exclusion from the definition of the term “commodity pool operator” under the Commodity Exchange Act (the “CEA”), and therefore, is not subject to registration or regulation as a pool operator under the CEA.

Options on futures contracts . In return for the premium paid, options on futures contracts give the purchaser the right to assume a position in a futures contract at the specified option exercise price at any time during the period of the option. Options on futures are similar to options on securities except that options on futures give the purchaser the right, in return for the premium paid, to assume a position in a futures contract (a long position if the option is a call and a short position if the option is a put) at a specified exercise price at any time during the period of the option. Upon exercise of the option, the delivery of the futures position by the writer of the option to the holder of the option will be accompanied by delivery of the accumulated balance in the writer’s futures margin account which represents

8

Table of Contents

the amount by which the market price of the futures contract, at exercise, exceeds (in the case of a call) or is less than (in the case of a put) the exercise price of the option on the futures. If an option is exercised on the last trading day prior to its expiration date, the settlement will be made entirely in cash. Purchasers of options who fail to exercise their options prior to the exercise date suffer a loss of the premium paid.

As with options on securities, the holder or writer of an option may terminate his position by selling or purchasing an offsetting option. There is no guarantee that such closing transactions can be effected.

The Limited Duration Bond Portfolio will be required to deposit initial margin and maintenance margin with respect to put and call options on futures contracts written by it pursuant to brokers’ requirements similar to those described above in connection with the discussion of futures contracts.

Risks of transactions in futures contracts and related options. Successful use of futures contracts by the Limited Duration Bond Portfolio is subject to the Adviser’s ability to predict movements in various factors affecting financial markets. Compared to the purchase or sale of futures contracts, the purchase of call or put options on futures contracts involves less potential risk to the Portfolio because the maximum amount at risk is the premium paid for the options (plus transaction costs). However, there may be circumstances when the purchase of a call or put option on a futures contract would result in a loss to the Portfolio when the purchase or sale of a futures contract would not, such as when there is no movement in the prices of the hedged investments. The writing of an option on a futures contract involves risks similar to those risks relating to the sale of futures contracts.

The use of options and futures strategies involves the risk of imperfect correlation among movements in the prices of the securities underlying the futures and options purchased and sold by the Limited Duration Bond Portfolio, of the options and futures contracts themselves, and, in the case of hedging transactions, of the securities which are the subject of a hedge. The successful use of these strategies further depends on the ability of the Adviser to forecast interest rates and market movements correctly.

There is no assurance that higher than anticipated trading activity or other unforeseen events might not, at times, render certain market clearing facilities inadequate, and thereby result in the institution by exchanges of special procedures which may interfere with the timely execution of customer orders.

To reduce or eliminate a position held by the Limited Duration Bond Portfolio, the Portfolio may seek to close out such a position. The ability to establish and close out positions will be subject to the development and maintenance of a liquid secondary market. It is not certain that this market will develop or continue to exist for a particular futures contract or option. Reasons for the absence of a liquid secondary market on an exchange include the following: (i) there may be insufficient trading interest in certain contracts or options; (ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of contracts or options, or underlying securities; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the facilities of an exchange or a clearing corporation may not at all times be adequate to handle current trading volume; or (vi) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of contracts or options (or a particular class or series of contracts or options), in which event the secondary market on that exchange for such contracts or options (or in the class or series of contracts or options) would cease to exist, although outstanding contracts or options on the exchange that had been issued by a clearing corporation as a result of trades on that exchange would likely continue to be exercisable in accordance with their terms.

U.S. Treasury security futures contracts and options. Some U.S. Treasury security futures contracts require the seller to deliver, or the purchaser to take delivery of, the type of U.S. Treasury security called for in the contract at a specified date and price; others may be settled in cash. Options on U.S. Treasury security futures contracts give the purchaser the right in return for the premium paid to assume a position in a U.S. Treasury security futures contract at the specified option exercise price at any time during the period of the option.

Successful use of U.S. Treasury security futures contracts by the Limited Duration Bond Portfolio is subject to the Adviser’s ability to predict movements in the direction of interest rates and other factors affecting markets for debt securities. For example, if the Portfolio has sold U.S. Treasury security futures contracts in order to hedge against

9

Table of Contents

the possibility of an increase in interest rates which would adversely affect the values of securities held in its portfolio, and the prices of the Portfolio’s securities increase instead as a result of a decline in interest rates, the Portfolio will lose part or all of the benefit of the increased value of its securities which it has hedged because it will have offsetting losses in its futures positions. In addition, in such situations, if the Portfolio has insufficient cash, it may have to sell securities to meet daily maintenance margin requirements at a time when it may be disadvantageous to do so.

There is also a risk that price movements in U.S. Treasury security futures contracts and related options will not correlate closely with price movements in markets for particular securities. For example, if the Limited Duration Bond Portfolio has hedged against a decline in the values of tax-exempt securities held by it by selling Treasury security futures and the values of Treasury securities subsequently increase while the values of the Portfolio’s tax-exempt securities decrease, the Portfolio would incur losses on both the Treasury security futures contracts written by it and the tax-exempt securities held in its portfolio.

Illiquid Securities

Each Portfolio, except for the Treasury Portfolio, may invest in illiquid securities. Each Index Portfolio, Bond Portfolio and the Tax Free Portfolio will invest no more than 15% 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. Each Money Market Portfolio (and Money Market Fund) is managed in accordance with Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”). As a result, each Money Market Portfolio (and Money Market Fund) has adopted the following liquidity policies (except as noted):

10

Table of Contents

Lending of Portfolio Securities

Each Index Portfolio may 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 an Index Portfolio. An Index Portfolio 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. An Index Portfolio 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, an Index Portfolio 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 Portfolio seeks to enforce its rights thereto, (b) possible sub-normal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights. A Portfolio’s securities lending agent may be an affiliate of the Adviser, and would be compensated by the Portfolio for its services.

Options on Securities and Securities Indices

Each Index Portfolio 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 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 Portfolios 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 Shares

Each Portfolio (except the Treasury Portfolio and the Treasury Plus Portfolio) may, to the extent permitted under the 1940 Act and exemptive rules and orders thereunder, invest in shares of other investment companies, which include Funds managed by SSgA FM, which invest exclusively in money market instruments or in investment companies with investment policies and objectives which are substantially similar to the Portfolio’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 Portfolio, except for the Treasury Portfolio, may enter into repurchase agreements with banks and other financial institutions, such as broker-dealers. Under a repurchase agreement, the Portfolio purchases securities from a financial institution that agrees to repurchase the securities at the Portfolio’s original purchase price plus interest within a specified time (normally one business day). The Portfolio 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 Portfolio 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 Portfolio.

Section 4(2) Commercial Paper/Rule 144A Securities

Each Portfolio, other than the Treasury Portfolios, may also invest in commercial paper issued in reliance on the private placement exemption from registration afforded by Section 4(2) of the Securities Act of 1933, as amended (“1933 Act”) (“Section 4(2) paper”) or in securities that that can be offered and sold only to “qualified institutional buyers” under Rule 144A of the 1933 Act (“Rule 144A securities”). The U.S. Government Portfolio may invest in Rule 144A securities, but not Section 4(2) paper.

11

Table of Contents

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 a transaction exempt from the registration requirements of the 1933 Act. Section 4(2) paper normally is resold to other institutional investors like the Portfolios through or with the assistance of the issuer or investment dealers that make a market in Section 4(2) paper. Rule 144A securities generally must be sold only to other institutional investors.

Section 4(2) paper and Rule 144A securities will not be considered illiquid for purposes of each Fund’s and Portfolio’s percentage limitations on illiquid securities when the Adviser (pursuant to guidelines adopted by the Board of Trustees) determines that a liquid trading market exists for the securities in question. There can be no assurance that a liquid trading market will exist at any time for any particular Section 4(2) paper or Rule 144A securities.

U.S. Government Securities

Each Portfolio may purchase U.S. Government securities. With respect to U.S. Government securities, the Treasury Portfolio will invest exclusively in direct obligations of the U.S. Treasury, such as U.S. Treasury bills, notes and bonds maturing within 397 days, and other mutual funds, subject to regulatory limitations, that invest exclusively in such obligations. The Treasury Plus Portfolio will invest only in direct obligations of the U.S. Treasury (U.S. Treasury bills, notes and bonds) and repurchase agreements collateralized by these obligations. The types of U.S. Government obligations in which each other Portfolio may at times invest include: (1) U.S. Treasury obligations 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, 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 U.S. Government securities it is not obligated to support.

The Money Portfolios may purchase U.S. Government obligations on a forward commitment basis.

Treasury Inflation-Protected Securities

The Money Portfolios, except for the Treasury Portfolios, and the Limited Duration Bond Portfolio may invest in Inflation-Protection Securities (“IPSs”), a type of inflation-indexed Treasury security. IPSs typically provide for semiannual payments of interest and a payment of principal at maturity. In general, each payment will be adjusted to take into account any inflation or deflation that occurs between the issue date of the security and the payment date based on the Consumer Price Index for All Urban Consumers (“CPI-U”).

Each semiannual payment of interest will be determined by multiplying a single fixed rate of interest by the inflation-adjusted principal amount of the security for the date of the interest payment. Thus, although the interest rate will be fixed, the amount of each interest payment will vary with changes in the principal of the security as adjusted for inflation and deflation.

IPSs also provide for an additional payment (a “minimum guarantee payment”) at maturity if the security’s inflation-adjusted principal amount for the maturity date is less than the security’s principal amount at issuance. The amount of the additional payment will equal the excess of the security’s principal amount at issuance over the security’s inflation-adjusted principal amount for the maturity date.

12

Table of Contents

When-Issued Securities

Each Portfolio 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 Portfolio until settlement takes place. When entering into a when-issued transaction, the Portfolio will rely on the other party to consummate the transaction; if the other party fails to do so, the Portfolio may be disadvantaged. The Money Portfolios will not invest more than 25% of their respective net assets in when-issued securities.

Securities purchased on a when-issued basis and held by a Portfolio are subject to changes in market value based upon actual or perceived 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 Portfolio 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 Portfolio’s net asset value (“NAV”).

Reverse Repurchase Agreements

The Aggregate Bond Index Portfolio, the Tax Free Portfolio, the Limited Duration Bond Portfolio, the Money Market Portfolio and the U.S. Government Portfolio may enter into reverse repurchase agreements under the circumstances described in “Investment Restrictions.” Under a reverse repurchase agreement, a Portfolio 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 Portfolio retains the right to receive interest and principal payments with respect to the securities while they are in the possession of the securities. Reverse repurchase agreements may create investment leverage and involve the risk that the market value of securities sold by a Portfolio 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 Portfolio’s ability to reacquire the underlying securities.

Total Return Swaps and Interest Rate Swaps

The Aggregate Bond Index Portfolio and the Bond Portfolio 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 Portfolio than if the Portfolio had invested directly in an instrument that yielded that desired return. A Portfolio’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 Portfolio to enter into swap agreements only with counterparties that would be eligible for consideration as repurchase agreement counterparties under the Portfolio’s repurchase agreement guidelines.

The Aggregate Bond Index Portfolio and Limited Duration Bond Portfolio may enter into interest rate swap transactions with respect to any security they are entitled to hold. Interest rate swaps involve the exchange by a Portfolio with another party of their respective rights to receive interest, e.g., an exchange of floating rate payments for fixed rate payments. A Portfolio 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 Portfolios intend to use these transactions as a hedge and not as a speculative investment. For example, the Portfolios may enter into an interest rate swap in order to protect against declines in the value of fixed income securities held by the Portfolios. In such an instance, the Portfolios may agree with a counterparty to pay a fixed rate (multiplied by a notional amount) and the counterparty to pay a floating rate multiplied by the same notional amount. If interest rates rise, resulting in a diminution in the value of a Portfolio, the Portfolio would receive payments under the swap that would offset, in whole or in part, such diminution in value; if interest rates fall, the Portfolio would likely lose money on the swap transaction.

13

Table of Contents

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

The Aggregate Bond Index Portfolio, the Limited Duration Bond Portfolio, the Money Market Portfolio and the U.S. Government Portfolio 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 Portfolio, the Bond Portfolio, the Tax Free Portfolio and the Money Portfolios may enter into contracts to purchase securities for a fixed price at a future date beyond customary settlement time (“forward commitments”) , consistent with the Fund’s ability to manage its investment portfolio, meet redemption requests, and for each Money Market Fund, maintain a stable net asset value. Forward commitments may be considered securities in themselves, and involve a risk of loss if the value of the security to be purchased declines prior to the settlement date, which risk is in addition to the risk of decline in the value of the Portfolio’s other assets. Where such purchases are made through dealers, the Portfolio relies on the dealer to consummate the sale. The dealer’s failure to do so may result in the loss to the Portfolio of an advantageous yield or price.

Although a Portfolio will generally enter into forward commitments with the intention of acquiring securities for its portfolio or for delivery pursuant to options contracts it has entered into, a Portfolio may dispose of a commitment prior to settlement if the Adviser deems it appropriate to do so. A Portfolio may realize short-term profits or losses upon the sale of forward commitments. When effecting such transactions, cash or other liquid assets (such as liquid high quality debt obligations) held by the Fund of a dollar amount sufficient to make payment for the portfolio securities to be purchased will be segregated on the Fund’s records at the trade date and maintained until the transaction is settled. Such segregated assets will be marked to market on a daily basis, and if the market value of such assets declines, additional cash or assets will be segregated so that the market value of the segregated assets will equal the amount of such the Fund’s obligations. Forward commitments involve a risk of loss if the value of the security to be purchased declines prior to the settlement date, or if the other party fails to complete the transaction.

Investment-Grade Bonds

The Aggregate Bond Index Portfolio and the Money Market Portfolio may invest in corporate notes and bonds that are rated investment-grade by a nationally recognized statistical rating organization (“NRSRO”) (and, in the case of the Money Market Portfolio, rated in one of the two short-term highest rating categories by at least two NRSROs or by one NRSRO if only one NRSRO has rated the security) or, if unrated, are of comparable quality to the rated securities described above, as determined by the Adviser, in accordance with procedures established by the Board of Trustees. Investment-grade securities include securities rated Baa or higher by Moody’s or BBB- or higher by S&P (and securities of comparable quality); securities rated Baa or BBB may have speculative characteristics.

Mortgage-Related Securities

The Aggregate Bond Index Portfolio, the Limited Duration Bond Portfolio, the Money Market Portfolio and the U.S. Government Portfolio may invest in mortgage-related securities. Mortgage-related securities represent an interest in a pool of, or are secured by, mortgage loans. Mortgage-related securities may be issued or guaranteed by (i) US Government agencies or instrumentalities such as the Government National Mortgage Association (“GNMA”) (also known as Ginnie Mae), the Federal National Mortgage Association (“FNMA”) (also known as Fannie Mae) and the Federal Home Loan Mortgage Corporation (“FHLMC”) (also known as Freddie Mac) or (ii) other issuers, including private companies.

14

Table of Contents

Many mortgage-related securities provide regular payments which consist of interest and, in most cases, principal. In contrast, other forms of debt securities normally provide for periodic payment of interest in fixed amounts with principal payments at maturity or specified call dates. In effect, payments on many mortgage-related securities are a “pass-through” of the payments made by the individual borrowers on their mortgage loans, net of any fees paid to the issuer or guarantor of such securities.

Besides the scheduled repayment of principal, repayments of principal may result from the voluntary prepayment, refinancing or foreclosure of the underlying mortgage loans. If property owners make unscheduled prepayments of their mortgage loans, these prepayments will typically result in early payment of the applicable mortgage-related securities. The occurrence of mortgage prepayments is affected by a variety of factors including the level of interest rates, general economic conditions, the location and age of the mortgage, and other social and demographic conditions. During periods of falling interest rates, the rate of mortgage prepayments tends to increase, thereby tending to decrease the life of mortgage-related securities. During periods of rising interest rates, the rate of mortgage prepayments usually decreases, thereby tending to increase the life of mortgage-related securities.

Because of the possibility of prepayments (and due to scheduled repayments of principal), mortgage-related securities are less effective than other types of securities as a means of “locking in” attractive long-term interest rates. Prepayments would have to be reinvested at lower rates. As a result, these securities may have less potential for capital appreciation during periods of declining interest rates than other securities of comparable maturities, although they may have a similar risk of decline in market value during periods of rising interest rates. Prepayments may also significantly shorten the effective maturities of these securities, especially during periods of declining interest rates. Conversely, during periods of rising interest rates, a reduction in prepayments may increase the effective maturities of these securities, subjecting them to a greater risk of decline in market value in response to rising interest rates than traditional debt securities, and, therefore, potentially increasing the volatility of the Funds.

Collateralized mortgage obligations (“CMOs”) may be issued by a U.S. Government agency or instrumentality or by a private issuer. CMOs are typically structured with classes or series that have different maturities and are generally retired in sequence. Each class of obligations receives periodic interest payments according to its terms. However, monthly principal payments and any prepayments from the collateral pool are generally paid first to the holders of the most senior class. Thereafter, payments of principal are generally allocated to the next most senior class of obligations until that class of obligations has been fully repaid. Any or all classes of obligations of a CMO may be paid off sooner than expected because of an increase in the payoff speed of the pool. Changes in prepayment rates may have significant effects on the values and the volatility of the various classes and series of a CMO. Payment of interest or principal on some classes or series of a CMO may be subject to contingencies or some classes or series may bear some or all of the risk of default on the underlying mortgages.

Stripped mortgage-related securities are usually structured with two classes that receive different portions of the interest and principal distributions on a pool of mortgage loans. The yield to maturity on an interest only or “IO” class of stripped mortgage-related securities is extremely sensitive not only to changes in prevailing interest rates but also to the rate of principal payments (including prepayments) on the underlying assets. A rapid rate of principal prepayments may have a measurable adverse effect on a Fund’s yield to maturity to the extent it invests in IOs. If the assets underlying the IO experience greater than anticipated prepayments of principal, the Fund may fail to recoup fully, or at all, its initial investment in these securities. Conversely, principal only securities or “POs” tend to increase in value if prepayments are greater than anticipated and decline if prepayments are slower than anticipated. The secondary market for stripped mortgage-related securities may be more volatile and less liquid than that for other mortgage-related securities, potentially limiting a Fund’s ability to buy or sell those securities at any particular time.

Government Mortgage-Related Securities

GNMA is the principal federal government guarantor of mortgage-related securities. GNMA is a wholly owned U.S. Government corporation within the Department of Housing and Urban Development. It guarantees, with the full

15

Table of Contents

faith and credit of the United States, full and timely payment of all monthly principal and interest on its mortgage-related securities. GNMA pass-through securities are considered to have a relatively low risk of default in that (1) the underlying mortgage loan portfolio is comprised entirely of government-backed loans and (2) the timely payment of both principal and interest on the securities is guaranteed by the full faith and credit of the U.S. Government, regardless of whether they have been collected. GNMA pass-through securities are, however, subject to the same interest rate risk as comparable privately issued mortgage-related securities. Therefore, the effective maturity and market value of a fund’s GNMA securities can be expected to fluctuate in response to changes in interest rate levels.

Residential mortgage loans are also pooled by FHLMC, a corporate instrumentality of the U.S. Government. The mortgage loans in FHLMC’s portfolio are not government backed; FHLMC, not the U.S. Government, guarantees the timely payment of interest and ultimate collection of principal on FHLMC securities. FHLMC also issues guaranteed mortgage certificates, on which it guarantees semiannual interest payments and a specified minimum annual payment of principal.

FNMA is a government-sponsored corporation owned entirely by private stockholders. It is subject to general regulation by the Secretary of Housing and Urban Development. FNMA purchases residential mortgages from a list of approved seller/servicers, which include savings and loan associations, savings banks, commercial banks, credit unions and mortgage bankers. Pass-through securities issued by FNMA are guaranteed as to timely payment of principal and interest only by FNMA, not the U.S. Government.

Mortgage-Backed Security Rolls

The Aggregate Bond Index Portfolio may enter into “forward roll” transactions with respect to mortgage-related securities issued by GNMA, FNMA or FHLMC. In a forward roll transaction, a Portfolio will sell a mortgage-related security to a bank 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 typically 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. A Portfolio that engages in a forward roll transaction forgoes principal and interest paid on the securities sold during the roll period, but is compensated by the difference between the current sales price and the lower forward price for the future purchase. In addition, a Portfolio earns interest by investing the transaction proceeds during the roll period. A forward roll transaction may create investment leverage. A Portfolio is subject to the risk that the value of securities to be purchased pursuant to a forward roll transaction will decline over the roll period, and that the Portfolio’s counterparty may be unwilling or unable to perform its obligations to the Portfolio. Upon entering into a mortgage-backed security roll, the participating Portfolio will segregate on its records cash, US Government securities or other high-grade debt securities in an amount sufficient to cover to its obligation under the roll.

Other Asset-Backed Securities

The Aggregate Bond Index Portfolio and the Money Market Portfolio may invest in asset-backed securities that are not mortgage-related. Asset-backed securities other than mortgage-related securities represent undivided fractional interests in pools of instruments, such as consumer loans, and are typically similar in structure to mortgage-related pass-through securities. 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, if any, varies, applying only until exhausted and generally covering only a fraction of the security’s par value.

The value of such asset-backed securities is affected by changes in the market’s perception of the asset backing the security, changes in the creditworthiness of the servicing agent for the instrument pool, the originator of the instruments, or the financial institution providing any credit enhancement and the expenditure of any portion of any credit enhancement. The risks of investing in asset-backed securities are ultimately dependent upon payment of the underlying instruments by the obligors, and a Fund would generally have no recourse against the obligee of the instruments in the event of default by an obligor. The underlying instruments are subject to prepayments which shorten the duration of asset-backed securities and may lower their return, in generally the same manner as described above for prepayments of pools of mortgage loans underlying mortgage-related securities.

16

Table of Contents

Variable and Floating Rate Securities

The Aggregate Bond Index Portfolio, the Bond Portfolio, the Money Market Portfolio, the Tax Free Portfolio and the U.S. Government Portfolio may invest in variable and floating rate securities. Variable rate securities are instruments issued or guaranteed by entities such as (1) U.S. Government, or an agency or instrumentality thereof, (2) corporations, (3) financial institutions, (4) insurance companies or (5) trusts that have a rate of interest subject to adjustment at regular intervals but less frequently than annually. 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 will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate. The Limited Duration Bond Portfolio may also invest in funding agreements, which are privately placed, unregistered obligations negotiated with a purchaser.

Variable Amount Master Demand Notes

The Money Market Portfolio, the U.S. Government Portfolio and the Bond Portfolio may invest in variable amount master demand notes which are unsecured obligations that are redeemable upon demand and are typically unrated. These instruments are issued pursuant to written agreements between their issuers and holders. The agreements permit the holders to increase (subject to an agreed maximum) and the holders and issuers to decrease the principal amount of the notes, and specify that the rate of interest payable on the principal fluctuates according to an agreed formula. Generally, changes in interest rates will have a smaller effect on the market value of these securities than on the market value of comparable fixed income obligations. Thus, investing in these securities generally allows less opportunity for capital appreciation and depreciation than investing in comparable fixed income securities. There may be no active secondary market with respect to a particular variable rate instrument.

Zero Coupon Securities

The Aggregate Bond Index Portfolio, the Bond Portfolio, the Money Market Portfolio and the U.S. Government Portfolio 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 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. The Portfolios will not receive cash payments on a current basis from the issuer in respect of accrued original issue discount (“OID”), but investors will be required to accrue OID for U.S. federal income tax purposes. To generate sufficient cash for a Fund to make the requisite distributions to maintain its qualification for treatment as a “regulated investment company” (“RIC”) under the Internal Revenue Code of 1986, as amended (the “Code”), a Fund may be required to redeem a portion of its interest in a Portfolio in order to obtain sufficient cash to satisfy the 90% distribution requirement with respect to the OID accrued on zero coupon bonds. The Portfolio in turn may sell investments in order to meet such redemption requests, including at a time when it may not be advantageous to do so.

The Money Portfolio, the U.S. Government Portfolio and the Bond Portfolio may invest no more than 25% of their 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.

17

Table of Contents

Municipal and Municipal-Related Securities

Municipal securities may bear fixed, floating or variable rates of interest or may be zero coupon securities. Municipal securities are generally of two types: general obligations and revenue obligations. General obligations are backed by the full faith and credit of the issuer. These securities include tax anticipation notes, bond anticipation notes, general obligation bonds and commercial paper. Revenue obligations are backed by the revenues generated from a specific project or facility and include industrial development bonds and private activity bonds. Tax anticipation notes are issued to finance working capital needs of municipalities and are generally issued in anticipation of future tax revenues. Bond anticipation notes are issued in expectation of the issuer obtaining longer-term financing.

The Tax Free Portfolio and the Bond Portfolio may invest in municipal and municipal-related securities. Municipal obligations are affected by economic, business or political developments. These securities may be subject to provisions of litigation, bankruptcy and other laws affecting the rights and remedies of creditors, or may become subject to future laws extending the time for payment of principal and/or interest, or limiting the rights of municipalities to levy taxes. The Portfolios may be more adversely impacted by changes in tax rates and policies than other funds. Because interest income from municipal securities is normally not subject to regular federal income taxation, the attractiveness of municipal securities in relation to other investment alternatives is affected by changes in federal income tax rates applicable to, or the continuing federal income tax-exempt status of, such interest income. Any proposed or actual changes in such rates or exempt status, therefore, can significantly affect the demand for and supply, liquidity and marketability of municipal securities. This could in turn affect a Portfolio’s ability to acquire and dispose of municipal securities at desirable yield and price levels. Concentration of a Portfolio’s investments in these municipal obligations will subject the Portfolio, to a greater extent than if such investment was not so concentrated, to the risks of adverse economic, business or political developments affecting the particular state, industry or other area of concentration. Issuers, including governmental issuers, of municipal securities may be unable to pay their obligations as they become due. Recent declines in tax revenues, and increases in liabilities, such as pension and health care liabilities, may increase the actual or perceived risk of default on such securities.

Auction Rate Securities.

Auction rate municipal securities permit the holder to sell the securities in an auction at par value at specified intervals. The dividend or interest is typically reset by “Dutch” auction in which bids are made by broker-dealers and other institutions for a certain amount of securities at a specified minimum yield. The rate set by the auction is the lowest interest or dividend rate that covers all securities offered for sale. While this process is designed to permit auction rate securities to be traded at par value, there is the risk that an auction will fail due to insufficient demand for the securities. A Portfolio will take the time remaining until the next scheduled auction date into account for purposes of determining the securities’ duration. The Tax Free Portfolio does not invest in auction rate securities.

Industrial Development and Private Activity Bonds.

Industrial development bonds are issued to finance a wide variety of capital projects including: electric, gas, water and sewer systems; ports and airport facilities; colleges and universities; and hospitals. The principal security for these bonds is generally the net revenues derived from a particular facility, group of facilities, or in some cases, the proceeds of a special excise tax or other specific revenue sources. Although the principal security behind these bonds may vary, many provide additional security in the form of a debt service reserve fund whose money may be used to make principal and interest payments on the issuer’s obligations. Some authorities provide further security in the form of a state’s ability without obligation to make up deficiencies in the debt service reserve fund.

Private activity bonds are considered municipal securities if the interest paid thereon is exempt from federal income tax and are issued by or on behalf of public authorities to raise money to finance various privately operated facilities for business and manufacturing, housing, sports, and pollution control. These bonds are also used to finance public facilities such as airports, mass transit systems, ports and parking. The payment of the principal and interest on such bonds is dependent solely on the ability of the facility’s user to meet its financial obligations and the value of any real or personal property pledged as security for such payment. As noted in each Portfolio’s Prospectus and discussed below under “Taxation of the Funds,” interest income on these bonds may be an item of tax preference subject to federal alternative minimum tax for individuals and corporations.

18

Table of Contents

Insured Municipal Securities.

Insured municipal securities are those for which scheduled payments of interest and principal are guaranteed by a private (non-governmental) insurance company. The insurance entitles a fund to receive only the face or par value of the securities held by the fund, but the ability to be paid is limited to the claims paying ability of the insurer. The insurance does not guarantee the market value of the municipal securities or the net asset value of a fund’s shares. Insurers are selected based upon the diversification of its portfolio and the strength of the management team which contributes to the claims paying ability of the entity. However, the Adviser selects securities based upon the underlying credit with bond insurance viewed as an enhancement only. The Adviser’s objective is to have an enhancement that provides additional liquidity to insulate against volatility in changing markets.

Municipal Leases.

The Tax Free Portfolio may purchase participation interests in municipal obligations, including municipal lease/purchase agreements. Municipal leases are an undivided interest in a portion of an obligation in the form of a lease or installment purchase issued by a state or local government to acquire equipment or facilities. These instruments may have fixed, floating or variable rates of interest, with remaining maturities of 13 months or less. Certain participation interests may permit a Portfolio to demand payment on not more than seven days’ notice, for all or any part of the fund’s interest, plus accrued interest.

Municipal leases frequently have special risks not normally associated with general obligation or revenue bonds. Some leases or contracts include “non-appropriation” clauses, which provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for such purpose by the appropriate legislative body on a yearly or other periodic basis. To reduce these risks, the Portfolios will only purchase municipal leases subject to a non-appropriation clause when the payment of principal and accrued interest is backed by a letter of credit or guarantee of a bank.

Whether a municipal lease agreement will be considered illiquid for the purpose of a Portfolio’s restriction on investments in illiquid securities will be determined in accordance with procedures established by the Board of Trustees.

Pre-Refunded Municipal Securities.

The interest and principal payments on pre-refunded municipal securities are typically paid from the cash flow generated from an escrow fund consisting of U.S. Government securities. These payments have been “pre-refunded” using the escrow fund.

Tender Option Bonds.

A tender option is a municipal obligation (generally held pursuant to a custodial arrangement) having a relatively long maturity and bearing interest at a fixed rate substantially higher than prevailing short-term tax exempt rates, that has been coupled with the agreement of a third party, such as a bank, broker-dealer or other financial institution, pursuant to which such institution grants the security holders the option, at periodic intervals, to tender their securities to the institution and receive the face value thereof. As consideration for providing the option, the financial institution receives periodic fees equal to the difference between the municipal obligation’s fixed coupon rate and the rate, as determined by a remarketing or similar agent at or near the commencement of such period, that would cause the securities, coupled with the tender option, to trade at par on the date of such determination. Thus, after payment of this fee, the security holder effectively holds a demand obligation that bears interest at the prevailing short-term tax exempt rate. Subject to applicable regulatory requirements, a Portfolio may buy tender option bonds if the agreement gives the Portfolio the right to tender the bond to its sponsor no less frequently than once every 397 days. The Adviser will consider on an ongoing basis the creditworthiness of the issuer of the underlying obligation, any custodian and the third party provider of the tender option. In certain instances and for certain tender option bonds, the option may be terminable in the event of a default in payment of principal or interest on the underlying municipal obligation and for other reasons.

19

Table of Contents

Asset Segregation and Coverage

A Fund may be required to earmark or otherwise segregate liquid assets in respect of its obligations under derivatives transactions that involve contractual obligations to pay in the future, or a Fund may engage in other measures to “cover” its obligations with respect to such transactions. The amounts that are earmarked or otherwise segregated may be based on the notional value of the derivative or on the daily mark-to-market obligation under the derivatives contract and may be reduced by amounts on deposit with the applicable broker or counterparty to the derivatives transaction. In certain circumstances, a Fund may enter into an offsetting position rather than earmarking or segregating liquid assets. A Fund may modify its asset segregation and coverage policies from time to time. Although earmarking or segregating may in certain cases have the effect of limiting a Fund’s ability to engage in derivatives transactions, the extent of any such limitation will depend on a variety of factors, including the method by which the Fund determines the nature and amount of assets to be earmarked or segregated.

Tax Exempt Commercial Paper

The Tax Free Portfolio and the Bond Portfolio may invest in tax exempt commercial paper. Tax exempt commercial paper is a short-term obligation with a stated maturity of 365 days or less. It is typically issued to finance seasonal working capital needs or as short-term financing in anticipation of longer term financing. Each instrument may be backed only by the credit of the issuer or may be backed by some form of credit enhancement, typically in the form of a guarantee by a commercial bank. Commercial paper backed by guarantees of foreign banks may involve additional risk due to the difficulty of obtaining and enforcing judgments against such banks and the generally less restrictive regulations to which such banks are subject. The Portfolios will only invest in commercial paper rated at the time of purchase not less than Prime-1 by Moody’s Investors Service, Inc., A-1 by Standard & Poor’s Rating Group or
F-1 by Fitch Ratings. See Appendix A for more information on the ratings of debt instruments.

Fundamental Investment Restrictions

The Portfolios in which the Funds invest each have substantially the same investment restrictions as their corresponding Funds. 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 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.

20

Table of Contents

For the State Street Equity 500 Index Fund, State Street Equity 400 Index Fund, State Street Equity 2000 Index Fund, State Street Aggregate Bond Index Fund, State Street Institutional Limited Duration Bond Fund (“Non-Money Market Funds”):

For the State Street Institutional Liquid Reserves Fund, State Street Institutional U.S. Government Money Market Fund, State Street Institutional Treasury Money Market Fund, State Street Institutional Treasury Plus Money Market Fund and State Street Institutional Tax Free Money Market Fund (collectively, the “Money Market Funds”):

With respect to the Money Market Funds’ investment policy on concentration (#6 above), a Fund may concentrate in bankers’ acceptances, certificates of deposit and similar instruments when, in the opinion of the Adviser, the yield, marketability and availability of investments meeting the Fund’s quality standards in the banking industry justify any additional risks associated with the concentration of the Fund’s assets in such industry.

For each Fund, all percentage limitations (except the limitation to borrowings) 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 expressly identified as fundamental, or to the extent designated as such in the Prospectus with respect to a Fund, the other investment policies described in this SAI or in the Prospectus are not fundamental and may be changed by approval of the Trustees without shareholder approval.

The interest holders of each master portfolio have approved the same fundamental investment restrictions as the corresponding Fund.

Non-Fundamental Investment Restrictions

In addition, it is contrary to the Non-Money Market Funds’ present policies, 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, 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.

21

Table of Contents

Disclosure of Portfolio Holdings

Introduction

The policies set forth below to be followed by the State Street Bank and Trust Company (“State Street”) and SSgA Funds Management, Inc. (“SSgA FM” and, collectively, the “Service Providers”) for the disclosure of information about the portfolio holdings of the SSgA Funds, State Street Master Funds, and State Street Institutional Investment Trust (each, a “Trust”). These disclosure policies are intended to ensure compliance by the Service Providers and the Trust with applicable regulations of the federal securities laws, including the Investment Company Act of 1940, as amended (“1940 Act”) and the Investment Advisers Act of 1940, as amended. The Board of Trustees of the Trust must approve all material amendments to the policy.

General Policy

It is the policy of the Service Providers to protect the confidentiality of client holdings and prevent the selective disclosure of non-public information concerning the Trust.

Exception

No information concerning the portfolio holdings of the Trust may be disclosed to any party (including shareholders) except as provided below.

Publicly Available Information. Any party may disclose portfolio holdings information after the holdings are publicly available.

Disclosure of the complete holdings of each series of the Trust (each, a “Fund”) is required to be made quarterly within 60 days of the end of the Fund’s fiscal quarter in the Annual Report and Semi-Annual Report to Fund shareholders and in the quarterly holdings report on Form N-Q (filed after the first and third fiscal quarters). These reports are available, free of charge, on the EDGAR database on the SEC’s website at www.sec.gov . Each Fund will also make complete portfolio holdings available generally no later than 60 calendar days after the end of such Fund’s fiscal quarter or subsequent to periodic portfolio holdings disclosure in the Fund’s filings with the SEC or on their website. Each money market fund generally will post on its website (or, in the case of a master fund, on the corresponding feeder fund’s website) a full list of its portfolio holdings each Friday reflecting the portfolio holdings of the fund on the immediately preceding Wednesday. Each money market fund will also post a full list of its portfolio holdings on its website (or, in the case of a master fund, on the corresponding feeder fund’s website) no later than the fifth business day of each month reflecting its portfolio holdings as of the last business day of the previous month. Such monthly posting shall contain such information as required by Rule 2a-7(c)(12) under the 1940 Act and remain posted on the website for not less than six months.

Press Interviews Brokers and Other Discussions

Portfolio managers and other senior officers or spokespersons of the Service Providers or the Trust may disclose or confirm the ownership of any individual portfolio holding position to reporters, brokers, shareholders, consultants or other interested persons only if such information has been previously publicly disclosed in accordance with these disclosure policies. For example, a portfolio manager discussing the Trust may indicate that he owns XYZ Company for the Trust only if the Trust’s ownership of such company has previously been publicly disclosed.

Trading Desk Reports

State Street Global Advisors’ trading desk may periodically distribute lists of investments held by its clients (including the Trust) for the general analytical research purposes. In no case may such lists identify individual clients or individual client position sizes. Furthermore, in the case of equity securities, such lists shall not show aggregate client position sizes.

22

Table of Contents

Miscellaneous

Confidentiality Agreement . No non-public disclosure of the Trust’s portfolio holdings will be made to any party unless such party has signed a written Confidentiality Agreement. For purposes of the disclosure policies, any Confidentiality Agreement must be in a form and substance acceptable to, and approved by, the Trust’s officers.

Evaluation Service Providers. There are numerous mutual fund evaluation services (Morningstar and Lipper) and due diligence departments of broker-dealers and wirehouses that regularly analyze the portfolio holdings of mutual funds in order to monitor and report on various attributes. These services and departments then distribute the results of their analysis to the public, paid subscribers and/or in-house brokers. In order to facilitate the review of the Trust by these services and departments, the Trust may distribute (or authorize the Service Providers and the Trust’s custodian or fund accountants to distribute) month-end portfolio holdings to such services and departments only if such entity has executed a confidentiality agreement.

Additional Restrictions . Notwithstanding anything herein to the contrary, the Trust’s Board of Trustees, State Street and SSgA FM may, on a case-by-case basis, impose additional restrictions on the dissemination of portfolio information beyond those found in these disclosure policies.

Waivers of Restrictions. These disclosure policies may not be waived, or exceptions made, without the consent of the Trust’s officers. All waivers and exceptions involving the Trust will be disclosed to the Board of Trustees of the Trust no later than its next regularly scheduled quarterly meeting.

Disclosures Required by Law . Nothing contained herein is intended to prevent the disclosure of portfolio holdings information as may be required by applicable law. For example, SSgA FM, State Street, the Trust or any of its affiliates or service providers may file any report required by applicable law (such as Schedules 13D, 13G and 13F or Form N-MFP), respond to requests from regulators and comply with valid subpoenas.