State Street Institutional Investment Trust

State Street Hedged International Developed Equity Index Fund

Investment Objective

The State Street Hedged International Developed Equity Index Fund (the “Hedged International Developed Equity Index Fund” or sometimes referred to in context as the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based developed market (ex-U.S. and Canada) large and mid capitalization equity index, hedged to the U.S. dollar, over the long term.

Fees and Expenses of the Fund

The tables below describe the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Fund Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

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

Management Fee1	0.14%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses	0.22%
Total Annual Fund Operating Expenses	0.36%
Less Fee Waivers and/or Expense Reimbursements2	(0.16%)
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.20%

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2025 to waive the portion of the Fund's management fee attributable to the Fund's assets invested in the Portfolio. This arrangement may not be terminated prior to April 30, 2025 except with the approval of the Fund's Board of Trustees.

The Adviser is contractually obligated until April 30, 2025 (i) to waive up to the full amount of the advisory fee payable by the Fund and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees other than the fees of the Portfolio, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.15% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2025 except with approval of the Fund's Board of Trustees.

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell or hold all of your Fund 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. The calculation of costs for the one-year period takes into account the effect of any current contractual fee waivers and/or reimbursements; and the calculation of costs for the remaining periods takes such fee waivers and/or reimbursements into account only for the first year of each such period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 year	3 years	5 years	10 years
$20	$99	$186	$440

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund Shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 8% of the average value of its portfolio.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return of the MSCI EAFE (Europe, Australasia, Far East) 100% Hedged to USD Index (the “Index”) over the long term. As an “index” fund, 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. The return of the Index is affected by the performance of Index constituents and the hedging strategy. In general, the Index would have higher returns than an equivalent unhedged index when the component currencies are weakening relative to the U.S. dollar. Conversely, the Index generally would have lower returns than an equivalent unhedged index when the component currencies are rising relative to the U.S. dollar.

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA Funds Management, Inc. (“SSGA FM” or the “Adviser”), the investment adviser to the Fund, may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, in currency hedging instruments (and related collateral, if any), or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), currency transactions, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

Under normal circumstances, the Fund will invest at least 80% of its net assets (plus borrowings, if any) in equity securities of issuers in developed economies or securities markets. For this purpose, countries with “developed economies or securities markets” refers to countries that are included in the Index, or a global developed markets equity index, and countries with similar characteristics (countries that have sustained economic development, sufficient liquidity for listed companies and accessible markets). The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in equity securities of issuers in developing economies or securities markets may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least 60 days' notice prior to any change in this 80% investment policy.

The Fund currently intends to gain all of its investment exposure to, and track the performance of, the Index constituents by investing in the State Street International Developed Equity Index Portfolio (the “Portfolio”) and employ its currency hedging strategy by directly entering into currency hedging transactions. The Adviser also serves as investment adviser to the Portfolio. When the Fund invests in the Portfolio, the Fund participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” with respect to the Index constituents also generally describe the expected investment activities of the Portfolio.

The Fund intends to hedge its non-U.S. currency exposure to the U.S. dollar, in a manner intended to replicate the currency hedge reflected in the Index. For this purpose, the Fund may enter into foreign currency forward contracts, forward currency futures and options, and currency swaps. The Index hedges each foreign currency in the Index back to the U.S. dollar by selling foreign currency forwards at the one-month forward rate. The size and exchange rate of each currency hedge is reset by the Index one time per month. Even if the Fund's hedging strategy works as intended, changes in currency exchange rates will still affect Fund returns (see “Currency Hedging Risk” below). The Fund's performance, like that of the Index, will depend on both the performance of the stocks comprising the Fund and the performance of the U.S. dollar relative to foreign currencies.

The Index is designed to capture the performance that can be achieved by hedging the currency exposures of its parent index, the MSCI EAFE Index, to the U.S. dollar. The MSCI EAFE Index is a free float-adjusted market capitalization index that is designed to capture large and mid-cap securities in developed market countries, excluding the United States and Canada. As of February 29, 2024, the MSCI EAFE Index comprised 782 securities covering companies across 21 countries and represented 85 % of the free float-adjusted market capitalization of those countries. As of February 29, 2024, a significant portion of the MSCI EAFE Index comprised companies in the financials sector, and companies located in Japan, the United Kingdom and Europe and a significant portion of the Index constituents are denominated in the Yen, the Pound Sterling and the Euro, although this may change from time to time. As of February 29, 2024, the full market capitalization of the companies included in the MSCI EAFE Index ranged from $1.36 billion to $388.34 billion. As of February 29, 2024, countries covered in the MSCI EAFE Index included Australia, Austria, Belgium, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom, although this may change from time to time.

The Index is sponsored by MSCI, Inc. (the “Index Provider”) which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

The Fund is subject to the following principal risks. You could lose money by investing in the Fund. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund's portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund. An investment in the Fund is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund may not achieve its investment objective. Because the Fund expects to achieve investment exposure through the Portfolio, it is subject to substantially all of the risks associated with the Portfolio. The Fund is not intended to be a complete investment program, but rather is intended for investment as part of a diversified investment portfolio. Investors should consult their own advisers as to the role of the Fund in their overall investment programs.

Market Risk: The Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile and prices of investments can change substantially due to various factors including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in the actual or perceived creditworthiness of issuers, and general market liquidity. The Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. Local, regional or global events such as war, military conflicts, acts of terrorism, natural disasters, the spread of infectious illness or other public health issues, or other events could have a significant impact on the Fund and its investments.

Equity Investing Risk: The market prices of equity securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer and also may decline due to general industry or market conditions that are not specifically related to a particular company. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Non-U.S. Securities Risk: Non-U.S. securities (including depositary receipts) are subject to political, regulatory, and economic risks not present in domestic investments. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, legal and financial report standards comparable to those in the United States. Further, such entities and/or their securities may be subject to risks associated with currency controls; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. Foreign governments may impose restrictions on the repatriation of capital to the U.S. In addition, to the extent that the Fund buys securities denominated in a foreign currency, there are special risks such as changes in currency exchange rates and the risk that a foreign government could regulate foreign exchange transactions. In addition, to the extent investments are made in a limited number of countries, events in those countries will have a more significant impact on the Fund. Investments in depositary receipts may be less liquid and more volatile than the underlying shares in their primary trading market.

Geographic Focus Risk: The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

Europe: Developed and emerging market countries in Europe will be significantly affected by the fiscal and monetary controls of the Economic and Monetary Union of the European Union (“EU”). Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of the euro and recessions among European countries may have a significant adverse effect on the economies of other European countries. In addition, one or more countries may abandon the euro and/or withdraw from the EU For example, on January 31, 2020, the United Kingdom formally withdrew from the EU (commonly referred to as “Brexit”) and, after a transition period, left the EU single market and customs union under the terms of a new trade agreement on December 31, 2020. The agreement governs the new relationship between the United Kingdom and EU with respect to trading goods and services, but critical aspects of the relationship remain unresolved and subject to further negotiation and agreement. The full scope and nature of the consequences of the exit are not at this time known and are unlikely to be known for a significant period of time. It is also unknown whether the United Kingdom's exit will increase the likelihood of other countries also departing the EU Any exits from the EU, or the possibility of such exits, may have a significant impact on the United Kingdom, Europe, and global economies, which may result in increased volatility and illiquidity, new legal and regulatory uncertainties and potentially lower economic growth for such economies that could potentially have an adverse effect on the value of the Fund's investments. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

Japan: The growth of Japan's economy has historically lagged that of its Asian neighbors and other major developed economies. The Japanese economy is heavily dependent on international trade and has been adversely affected by trade tariffs, other protectionist measures, competition from emerging economies and the economic conditions of its trading partners. China has become an important trading partner with Japan, yet the countries' political relationship has become strained. Should political tension increase, it could adversely affect the economy, especially the export sector, and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. The Japanese yen has fluctuated widely at times and any increase in its value may cause a decline in exports that could weaken the Japanese economy. Japan has, in the past, intervened in the currency markets to attempt to maintain or reduce the value of the yen. Japanese intervention in the currency markets could cause the value of the yen to fluctuate sharply and unpredictably and could cause losses to investors. Japan has an aging workforce and has experienced a significant population decline in recent years. Japan's labor market appears to be undergoing fundamental structural changes, as a labor market traditionally accustomed to lifetime employment adjusts to meet the need for increased labor mobility, which may adversely affect Japan's economic competitiveness. Natural disasters, such as earthquakes, volcanoes, typhoons or tsunamis, could occur in Japan or surrounding areas and could negatively affect the Japanese economy and, in turn, the Fund.

United Kingdom: The United Kingdom has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the United Kingdom. As a result, the British economy may be impacted by changes to the economic condition of the United States and other European countries. The British economy relies heavily on the export of financial services to the United States and other European countries and, therefore, a prolonged slowdown in the financial services sector may have a negative impact on the British economy. Continued governmental involvement or control in certain sectors may stifle competition in certain sectors or cause adverse effects on economic growth.

Currency Hedging Risk: When a derivative is used as a hedge against a position that the Fund holds, any gain generated by the derivative generally should be substantially offset by losses on the hedged investment, and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between a derivative and its reference asset. For example, because the Fund's currency hedge is reset on a monthly basis, based on the size of the Fund's exposure to a currency at a certain point in time, the size of each currency hedge could be greater or less than the Fund's total exposure in that currency intra-month and currency risk may develop or increase between resets. Furthermore, while the Fund is designed to hedge against currency fluctuations, it is possible that a degree of currency exposure may remain even at the time a hedging transaction is implemented. As a result, changes in currency exchange rates may affect Fund returns even when the hedge works as intended. The effectiveness of the Fund's currency hedging strategy will also generally be affected by both the volatility of the securities included in the Index, and the volatility of the U.S. dollar relative to the currencies to be hedged. Increased volatility may reduce the effectiveness of the Fund's currency hedging strategy and may impact the costs associated with hedging transactions. The effectiveness of the Fund's currency hedging strategy and the costs associated with hedging transactions may also in general be affected by interest rates. Significant differences between U.S. dollar interest rates and foreign currency interest rates may further impact the effectiveness of the Fund's currency hedging strategy. There can be no assurance that the Fund's hedging transactions will be effective. The Fund's currency hedging activities will potentially increase or accelerate distributions to shareholders, increase distributions taxed to individuals as ordinary income, result in the re-characterization of prior ordinary income distributions as return of capital, or generate losses that cannot be used to offset income or capital gain in subsequent years. The Fund will bear the costs associated with any such hedging transaction, regardless of any gain or loss experienced on the hedging transaction.

Currency Risk: Despite the Fund's currency hedging strategy, the value of the Fund's assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. Foreign currency exchange rates may have significant volatility, and changes in the values of foreign currencies against the U.S. dollar may result in substantial declines in the values of the Fund's, or the Portfolio's, assets denominated in foreign currencies. Because the Fund's, or the Portfolio's, net asset values (“NAVs”) are determined in U.S. dollars, the Fund's NAV could decline if the currency of a non-U.S. market in which the Fund invests depreciates against the U.S. dollar and the Fund's attempt to hedge currency exposure is unsuccessful. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency when measured in U.S. dollars, thereby decreasing the Fund's overall NAV. A foreign currency may be affected favorably or unfavorably by currency exchange rates, currency control regulations and restrictions or prohibitions on the repatriation of the foreign currency. Fluctuations in the exchange values of currencies could affect the economy or particular business operations of companies in a geographic region in which the Fund or the Portfolio invests, causing an adverse impact on the Fund's, or the Portfolio's, investments in the affected region and the United States. As a result, investors have the potential for losses regardless of the length of time they intend to hold Fund Shares.

Indexing Strategy/Index Tracking Risk: The Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. As a result, the Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index and, consequently, the performance, volatility, and risk of the Fund. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), the Fund's return may not match the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to

meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

Counterparty Risk: The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into derivatives contracts, repurchase agreements, reverse repurchase agreements, and other transactions. If a counterparty fails to meet its contractual obligations, the Fund may be unable to terminate or realize any gain on the investment or transaction, or to recover collateral posted to the counterparty, resulting in a loss to the Fund. If the Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty.

Depositary Receipts Risk: Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, the Fund will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Derivatives Risk: Derivative transactions can create investment leverage and may have significant volatility. It is possible that a derivative transaction will result in a much greater loss than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that the Fund may not be able to close out a derivative transaction at a favorable time or price. The counterparty to a derivatives contract may be unable or unwilling to make timely settlement payments, return the Fund's margin, or otherwise honor its obligations. A derivatives transaction may not behave in the manner anticipated by the Adviser or may not have the effect on the Fund anticipated by the Adviser.

Financial Sector Risk: Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Large-Capitalization Securities Risk: Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies. Larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies.

Large Shareholder Risk: To the extent a large proportion of the shares of the Portfolio are held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, the Portfolio is subject to the risk that these shareholders will purchase or redeem Portfolio shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. These transactions could adversely affect the ability of the Portfolio to conduct its investment program.

Liquidity Risk: Lack of a ready market, stressed market conditions, or restrictions on resale may limit the ability of the Fund to sell a security at an advantageous time or price or at all. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. Illiquidity of the Fund's holdings may also limit the ability of the Fund to obtain cash to meet redemptions on a timely basis. In addition, the Fund, due to limitations on investments in any illiquid investments and/or the difficulty in purchasing and selling such investments, may be unable to achieve its desired level of exposure to a certain market or sector.

Mid-Capitalization Securities Risk: The securities of mid-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of mid-sized companies may trade less frequently and in smaller volumes than more widely held securities. Some securities of mid-sized issuers may be illiquid or may be restricted as to resale, and their values may be volatile.

Risk of Investment in Other Pools: When the Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected and is exposed indirectly to all of the risks applicable to an investment in such other pool. The investment policies of the other pool may not be the same as those of the Fund; as a result, an investment in the other pool may be subject to additional or different risks than those to which the Fund is typically subject. The Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so.

Underlying Fund Risk: The Fund currently intends to gain all of its investment exposure to, and track the performance of, the index constituents by investing in another pooled investment vehicle (an “underlying fund”). The ability of the Fund to meet its investment objective with respect to the index constituents is directly related to the ability of the underlying fund to meet its investment objective. The Adviser serves as investment adviser to the underlying fund, leading to potential conflicts of interest. The Fund will bear its pro rata portion of the expenses incurred by the underlying fund. Substantial redemptions by other investors in an underlying fund may affect the underlying fund's investment program adversely and limit the ability of the underlying fund to achieve its objective.

Valuation Risk: Some portfolio holdings, potentially a large portion of the Fund's investment portfolio, may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. In addition, there is no assurance that the Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that the Fund would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by the Fund at that time. Investors who purchase or redeem Fund Shares on days when the Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

Performance

The bar chart and table below provide some indication of the risks of investing in the Hedged International Developed Equity Index Fund by illustrating the variability of the Fund's returns from year-to-year and by showing how the Fund's average annual returns for the periods indicated compared with that of (i) a broad measure of market performance and (ii) the Index. The bar chart shows how the Class K shares' returns have varied for each full calendar year shown. Except for differences in returns resulting from differences in fees and expenses, all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities. The Fund's past performance does not necessarily indicate how the Fund will perform in the future. Current performance information for the Fund is available toll free by calling (800) 997-7327 or by visiting our website at www.ssga.com.

Annual Total Return (years ended 12/31)

Highest Quarterly Return: 14.53% (Q2, 2020)
Lowest Quarterly Return: -20.79% (Q1, 2020)

Average Annual Total Returns (for periods ended 12/31/23)

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns depend on an investor's tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”). Except for differences in returns resulting from differences in fees, expenses, and sales charges (as applicable), all share classes would have substantially similar returns because all share classes invest in the same portfolio of securities.

	One Year	Five Years	Since Inception	Inception Date
Class K				5/29/2015
Return Before Taxes	19.73 %	11.71 %	6.96 %
Return After Taxes on Distributions	18.68 %	9.75 %	5.40 %
Return After Taxes on Distributions and Sale of Fund Shares	12.41 %	8.85 %	5.14 %
MSCI EAFE 100% Hedged to USD Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	19.95 %	11.79 %	7.24 %
MSCI ACWI ex USA Index (reflects no deduction for fees, expenses or taxes other than withholding taxes on reinvested dividends)	15.62 %	7.08 %	4.13 %

The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund.

The professionals primarily responsible for the day-to-day management of the Fund are Karl Schneider and David Chin, each of which has served as a portfolio manager of the Fund since inception in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Head of Traditional Beta Strategies for the Global Equity Beta Solutions Group in the Americas. He joined the Adviser in 1997.

David Chin is a Vice President of the Adviser and a Senior Portfolio Manager in the Global Equity Beta Solutions Group. He joined the Adviser in 1999.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
430 W 7th Street Suite 219737
Kansas City, MO 64105-1407

By Intermediary:

If you wish to purchase or redeem Fund Shares through a broker, bank or other financial intermediary (“Financial Intermediary”), please contact that Financial Intermediary directly. Your Financial Intermediary may have different or additional requirements for opening an account and/or for the processing of purchase and redemption orders, or may be closed at times when the Fund is open. Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at [email protected] with questions.

Tax Information

The Fund's distributions are expected to be taxed as ordinary income, qualified dividend income and/or capital gains, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or IRA. Any withdrawals made from such tax-advantaged arrangement may be taxable to you.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase Fund Shares through a broker-dealer or other Financial Intermediary (such as a bank), the Adviser or its affiliates may pay the Financial Intermediary for certain activities related to the Fund, including educational training programs, conferences, the development of technology platforms and reporting systems, or other services related to the sale or promotion of the Fund. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your Financial Intermediary's website for more information.

State Street International Developed Equity Index Fund

Investment Objective

The State Street International Developed Equity Index Fund (the “International Developed Equity Index Fund” or sometimes referred to in context as the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of a broad-based developed market (ex-U.S. and Canada) large and mid-capitalization equity index over the long term.

Fees and Expenses of the Fund

Shareholder Fees (fees paid directly from your investment)

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the sale proceeds or the original offering price)	None

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

Management Fee1	0.11%
Distribution and/or Shareholder Service (12b-1) Fees	0.00%
Other Expenses2	0.75%
Total Annual Fund Operating Expenses	0.86%
Less Fee Waivers and/or Expense Reimbursements3	(0.72)%
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements	0.14%

Other Expenses are based on estimates for the current fiscal year.

The Fund's investment adviser, SSGA Funds Management, Inc. (the “Adviser” or “SSGA FM”), is contractually obligated until April 30, 2025 (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees and expenses, any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.09% of average daily net assets on an annual basis. This waiver and/or reimbursement may not be terminated prior to April 30, 2025 except with approval of the Fund's Board of Trustees.

Example:

1 year	3 years
$14	$202

Portfolio Turnover:

held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund's performance. The Fund's portfolio turnover rate has been omitted because the Fund had not commenced investment operations prior to the end of the most recent fiscal year.

Principal Investment Strategies

The Fund is an “index” fund that seeks to track, before fees and expenses, the total return of the MSCI EAFE (Europe, Australasia, Far East) Index (the “Index”) over the long term. As an “index” fund, 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.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

The Fund currently intends to invest nearly all of its assets in the Portfolio, another open-end investment company managed by the Adviser, with an investment objective and policies substantially identical to those of the Fund. When the Fund invests in this “master-feeder” structure, the Fund's only investments are shares of the Portfolio and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the “Fund” also generally describe the expected investment activities of the Portfolio.

The Index is a free float-adjusted market capitalization index that is designed to capture large and mid-cap securities in developed market countries, excluding the United States and Canada. As of February 29, 2024, the Index comprised 782 securities covering companies across 21 countries and represented 85% of the free float-adjusted market capitalization of those countries. As of February 29, 2024, a significant portion of the Index comprised companies in the financials sector and companies located in Japan, the United Kingdom and Europe and a significant portion of the Index constituents are denominated in the Yen, the Pound Sterling and the Euro, although this may change from time to time. As of February 29, 2024, the full market capitalization of the companies included in the Index ranged from $1.36 billion to

$388.34 billion. As of February 29, 2024, countries covered in the Index included Australia, Austria, Belgium, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom, although this may change from time to time.

The Index is sponsored by MSCI, Inc. (the “Index Provider”), which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Principal Risks

The Fund is subject to the following principal risks. You could lose money by investing in the Fund. Certain risks relating to instruments and strategies used in the management of the Fund are placed first. The significance of any specific risk to an investment in the Fund will vary over time, depending on the composition of the Fund's portfolio, market conditions, and other factors. You should read all of the risk information presented below carefully, because any one or more of these risks may result in losses to the Fund. An investment in the Fund is subject to investment risks, including possible loss of principal, is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. The Fund may not achieve its investment objective. The Fund is not intended to be a complete investment program, but rather is intended for investment as part of a diversified investment portfolio. Investors should consult their own advisers as to the role of the Fund in their overall investment programs.

Currency Risk: The value of the Fund's assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and delays, restrictions or prohibitions on the repatriation of foreign currencies. Foreign currency exchange rates may have significant volatility, and changes in the values of foreign currencies against the U.S. dollar may result in substantial declines in the values of the Fund's assets denominated in foreign currencies.

Index), the Fund's return may not match the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, the Fund may not be fully invested at times, generally as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to replicate the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between the Fund's return and that of the Index.

Master/Feeder Structure Risk: The Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of the Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The Adviser serves as investment adviser to the master fund, leading to potential conflicts of interest. The Fund will bear its pro rata portion of the expenses incurred by the master fund. Substantial redemptions by other investors in a master fund may affect the master fund's investment program adversely and limit the ability of the master fund to achieve its objective.

Performance

Performance information for the Fund has been omitted because the Fund had not commenced investment operations as of the date of this Prospectus. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund's returns based on net assets and comparing the Fund's performance to the Index. The Fund will make updated performance information, including its current net asset value, available at the Fund's website: www.ssga.com.

Investment Adviser

SSGA FM serves as the investment adviser to the Fund and the Portfolio.

The professionals primarily responsible for the day-to-day management of the Portfolio and the Fund are Karl Schneider and David Chin, each of which has served as a portfolio manager of the Fund since organization in 2015.

Karl Schneider, CAIA, is a Managing Director of the Adviser and Head of Traditional Beta Strategies for the Global Equity Beta Solutions Group in the Americas. He joined the Adviser in 1997.

David Chin is a Vice President of the Adviser and a Senior Portfolio Manager in the Global Equity Beta Solutions Group. He joined the Adviser in 1999.

Purchase and Sale of Fund Shares

Purchase Minimums

The Fund's initial and subsequent investment minimums generally are as follows, although the Fund may reduce or waive the minimums in some cases.

Class K
To establish an account	None
To add to an existing account	None

You may purchase or redeem Fund Shares on any day the Fund is open for business.

Written Requests and Wire Transfers. You may purchase or redeem Fund Shares by written request or wire transfer.

Written requests should be sent to:

By Mail:

State Street Funds
P.O. Box 219737
Kansas City, MO 64121-9737

By Overnight/Registered, Express, Certified Mail:

State Street Funds
430 W 7th Street Suite 219737
Kansas City, MO 64105-1407

By Intermediary:

Tax Information

Payments to Broker-Dealers and Other Financial Intermediaries

Additional Information About Investment Objectives, Principal Strategies and Risks

Investment Objective

The State Street Institutional Investment Trust's (the “Trust”) Board of Trustees (the “Board”) may change each Fund's investment strategies and other policies without shareholder approval, except as otherwise indicated. The Board may change each Fund's investment objective without shareholder approval.

State Street Hedged International Developed Equity Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA FM may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Index Futures Contracts and Related Options. The Fund may buy and sell futures contracts 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 closes out 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 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. Funds that enter into contracts with counterparties run the risk that the counterparty will be unwilling or unable to make timely settlement payments or otherwise honor its obligations. This risk is typically less for exchange-traded derivatives, such as those the Fund may invest in.

These costs typically have the effect of reducing the correlation between the return of the Fund and the return of the Index. Because the market for futures contracts and options may be illiquid, the Fund may have to hold a contract or option when the Adviser would otherwise have closed out the position, or it may only be able to close out at a price lower than what the Adviser believes is the fair value of the contract or option, thereby potentially reducing the return of the Fund.

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 depend on the counterparty's ability or willingness to meet its obligations.

base; (iii) the location of the issuer's headquarters; (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues); (v) the issuer's history with respect to these criteria; and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the Index Provider and investors.

State Street International Developed Equity Index Fund

Principal Investment Strategies

In seeking to track the performance of the Index, the Fund expects to employ a sampling strategy, which means that the Fund will not typically purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index or other investments in an effort to create a portfolio of securities with generally the same risk and return characteristics of the Index. The number of holdings in the Fund will be based on a number of factors, including the asset size of the Fund. Based on its analysis of these factors, SSGA FM may, instead, invest the Fund's assets in substantially all of the securities represented in the Index in approximately the same proportions as the Index.

Under normal circumstances, the Fund invests substantially all, but as a matter of policy no less than 80%, of its net assets (plus borrowings, if any) in securities, or American Depositary Receipts (“ADRs”) or Global Depositary Receipts (“GDRs”) based on securities, comprising the Index, or in other funds, including funds sponsored by the Adviser or its affiliates, or in other investments, that the Adviser expects to provide a return highly correlated to the Index or a portion of the Index. The notional value of the Fund's investments in derivatives or other synthetic instruments that provide exposure comparable, in the judgment of the Adviser, to the foregoing types of investments may be counted toward satisfaction of this 80% policy. The Fund will provide shareholders with at least sixty (60) days' notice prior to any change in its policy to invest at least 80% of its assets as described in the foregoing. The Fund may invest in equity securities that are not included in the Index (including common stock, preferred stock, depositary receipts and shares of other investment companies), cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by the Adviser). The Fund may use derivatives, including futures contracts and options, swaps, and contracts for differences, to obtain investment exposures that the Adviser expects to correlate closely with the Index or a portion of the Index.

Additional Index Information. The Index's components are reconstituted on an ongoing, event-driven basis and are rebalanced quarterly. The Index Provider classifies each issuer in one country. The Index Provider generally determines the country classification of an issuer based on the issuer's country of incorporation and the primary listing of its securities. To the extent that an issuer is incorporated in a different country than the country in which its securities are principally traded, the Index Provider considers the following additional set of criteria to determine the issuer's country classification: (i) the secondary listings of the issuer's securities, if any; (ii) the geographic distribution of the issuer's shareholder base; (iii) the location of the issuer's headquarters; (iv) the geographic distribution of the issuer's operations (in terms of assets and revenues); (v) the issuer's history with respect to these criteria; and (vi) the country in which investors consider the issuer to be most appropriately classified based on communications between the Index Provider and investors.

Additional Information About Risks

The Funds are subject to the following principal risks. The risks are described in alphabetical order and not in the order of importance or potential exposure. Each principal risk without a parenthetical indicating a single Fund's name is applicable to each Fund.

Counterparty Risk. A Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into derivatives contracts and other transactions such as repurchase agreements or reverse repurchase agreements. A Fund's ability to profit from these types of investments and transactions will depend on the willingness and ability of its counterparty to perform its obligations. If a counterparty fails to meet its contractual obligations, a Fund may be unable to terminate or realize any gain on the investment or transaction, resulting in a loss to the Fund. A Fund may experience significant delays in obtaining any recovery in an insolvency, bankruptcy, or other reorganization proceeding involving its counterparty (including recovery of any collateral posted by it) and may obtain only a limited recovery or may obtain no recovery in such circumstances. If a Fund holds collateral posted by its counterparty, it may be delayed or prevented from realizing on the collateral in the event of a bankruptcy or insolvency proceeding relating to the counterparty. Under applicable law or contractual provisions, including if a Fund enters into an investment or transaction with a financial institution and such

financial institution (or an affiliate of the financial institution) experiences financial difficulties, then the Fund may in certain situations be prevented or delayed from exercising its rights to terminate the investment or transaction, or to realize on any collateral and may result in the suspension of payment and delivery obligations of the parties under such investment or transactions or in another institution being substituted for that financial institution without the consent of the Fund. Further, a Fund may be subject to “bail-in” risk under applicable law whereby, if required by the financial institution's authority, the financial institution's liabilities could be written down, eliminated or converted into equity or an alternative instrument of ownership. A bail-in of a financial institution may result in a reduction in value of some or all of its securities and, if a Fund holds such securities or has entered into a transaction with such a financial security when a bail-in occurs, such Fund may also be similarly impacted.

Currency Hedging Risk (principal risk for the Hedged International Developed Equity Index Fund). When a derivative is used as a hedge against a position that a Fund holds, any gain generated by the derivative generally should be substantially offset by losses on the hedged investment, and vice versa. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. Hedges are sometimes subject to imperfect matching between a derivative and its reference asset. For example, because the Fund's currency hedge is reset on a monthly basis, based on the size of the Fund's exposure to a currency at a certain point in time, the size of each currency hedge could be greater or less than the Fund's total exposure in that currency intra-month and currency risk may develop or increase between resets. Furthermore, while the Fund is designed to hedge against currency fluctuations, it is possible that a degree of currency exposure may remain even at the time a hedging transaction is implemented. As a result, changes in currency exchange rates may affect Fund returns even when the hedge works as intended. The effectiveness of a Fund's currency hedging strategy will also generally be affected by the volatility of both the securities included in the Index, and the volatility of the U.S. dollar relative to the currencies to be hedged. Increased volatility may reduce the effectiveness of a Fund's currency hedging strategy and may impact the costs associated with hedging transactions. The effectiveness of a Fund's currency hedging strategy and the costs associated with hedging transactions may also in general be affected by interest rates. Significant differences between U.S. dollar interest rates and foreign currency interest rates may further impact the effectiveness of a Fund's currency hedging strategy. There can be no assurance that a Fund's hedging transactions will be effective. A Fund's currency hedging activities will potentially increase or accelerate distributions to shareholders, increase distributions taxed to individuals as ordinary income, result in the re-characterization of prior ordinary income distributions as return of capital, or generate losses that cannot be used to offset income or capital gain in subsequent years. A Fund will bear the costs associated with any such hedging transaction, regardless of any gain or loss experienced on the hedging transaction.

Currency Risk. Investments in issuers in different countries are often denominated in currencies other than the U.S. dollar. Changes in the values of those currencies relative to the U.S. dollar may have a positive or negative effect on the values of a Fund's investments denominated in those currencies. The values of other currencies relative to the U.S. dollar may fluctuate in response to, among other factors, interest rate changes, intervention (or failure to intervene) by national governments, central banks, or supranational entities such as the International Monetary Fund, the imposition of currency controls, and other political or regulatory developments. Currency values can decrease significantly both in the short term and over the long term in response to these and other developments. Continuing uncertainty as to the status of the Euro and the Economic and Monetary Union of the European Union (the “EMU”) has created significant volatility in currency and financial markets generally. Any partial or complete dissolution of the EMU, or any continued uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's portfolio investments. With respect to the Hedged International Developed Equity Index Fund, to the extent the Adviser seeks to hedge against adverse changes in the values of currencies on the value of the Fund's assets, such hedging transactions may not have the desired effect or may cause the Fund to lose money.

Depositary Receipts Risk. American Depositary Receipts (“ADRs”) are typically trust receipts issued by a U.S. bank or trust company that evidence an indirect interest in underlying securities issued by a foreign entity. Global Depositary Receipts (“GDRs”), European Depositary Receipts (“EDRs”), and other types of depositary receipts are typically issued by non-U.S. banks or financial institutions to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity. Investments in non-U.S. issuers through ADRs, GDRs, EDRs, and other types of depositary receipts generally involve risks applicable to other types of investments in non-U.S. issuers. Investments in depositary receipts may be less liquid and more volatile than the underlying securities in their primary trading market. If a depositary receipt is denominated in a different currency than its underlying securities, a Fund will be subject to the currency risk of both the investment in the depositary receipt and the underlying security. There may be less publicly available information regarding the issuer of the securities underlying a depositary receipt than if those securities were traded directly in U.S. securities markets. Depositary receipts may or may not be sponsored by the issuers of the underlying securities, and

information regarding issuers of securities underlying unsponsored depositary receipts may be more limited than for sponsored depositary receipts. The values of depositary receipts may decline for a number of reasons relating to the issuers or sponsors of the depositary receipts, including, but not limited to, insolvency of the issuer or sponsor. Holders of depositary receipts may have limited or no rights to take action with respect to the underlying securities or to compel the issuer of the receipts to take action. The prices of depositary receipts may differ from the prices of securities upon which they are based. To the extent the Fund invests in depositary receipts based on securities included in the Index, such differences in prices may increase index tracking risk.

Derivatives Risk. A derivative is a financial contract the value of which depends on, or is derived from, the value of an underlying asset, interest rate, or index. Derivative transactions typically involve leverage and may have significant volatility. It is possible that a derivative transaction will result in a loss greater than the principal amount invested, that changes in the value of a derivative transaction may not correlate perfectly with the underlying asset, and that a Fund may not be able to close out a derivative transaction at a favorable time or price. Risks associated with derivative instruments include potential changes in value in response to interest rate changes or other market developments or as a result of the counterparty's credit quality; the potential for the derivative transaction not to have the effect the Adviser anticipated or a different or less favorable effect than the Adviser anticipated; the failure of the counterparty to the derivative transaction to perform its obligations under the transaction or to settle a trade; possible mispricing or improper valuation of the derivative instrument; imperfect correlation in the value of a derivative with the asset, rate, or index underlying the derivative; the risk that a Fund may be required to post collateral or margin with its counterparty, and will not be able to recover the collateral or margin in the event of the counterparty's insolvency or bankruptcy; the risk that a Fund will experience losses on its derivatives investments and on its other portfolio investments, even when the derivatives investments may be intended in part or entirely to hedge those portfolio investments; the risks specific to the asset underlying the derivative instrument; lack of liquidity for the derivative instrument, including, without limitation, absence of a secondary trading market; the potential for reduced returns to a Fund due to losses on the transaction and an increase in volatility; the potential for the derivative transaction to have the effect of accelerating the recognition of gain; and legal risks arising from the documentation relating to the derivative transaction.

Equity Investing Risk. The market prices of equity securities owned by a Fund may go up or down, sometimes rapidly or unpredictably. The value of a security may decline for a number of reasons that may directly relate to the issuer, such as management performance, financial leverage, non-compliance with regulatory requirements, and reduced demand for the issuer's goods or services. The values of equity securities also may decline due to general industry or market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates, or adverse investor sentiment generally. In addition, equity markets tend to move in cycles, which may cause stock prices to fall over short or extended periods of time.

Financial Sector Risk. Financial services companies are subject to extensive governmental regulation, which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, including U.S. and international credit and interbank money markets generally, thereby affecting a wide range of financial institutions and markets. Certain events in the financial sector may cause an unusually high degree of volatility in the financial markets, both domestic and foreign, and cause certain financial services companies to incur large losses. Securities of financial services companies may experience a dramatic decline in value when such companies experience substantial declines in the valuations of their assets, take action to raise capital (such as the issuance of debt or equity securities), or cease operations. Credit losses resulting from financial difficulties of borrowers and financial losses associated with investment activities can negatively impact the sector. Insurance companies may be subject to severe price competition. Adverse economic, business or political developments could adversely affect financial institutions engaged in mortgage finance or other lending or investing activities directly or indirectly connected to the value of real estate.

Geographic Focus Risk. The performance of a fund that invests significantly in one or more countries or geographic regions will be closely tied to market, currency, economic, political, environmental, or regulatory conditions and developments in the countries or regions in which the fund invests, and may be more volatile than the performance of a fund that does not invest significantly in such countries or regions.

Europe. The Economic and Monetary Union of the EU requires compliance with restrictions on inflation rates, deficits, interest rates, debt levels and fiscal and monetary controls, each of which may significantly affect every country in Europe. Decreasing imports or exports, changes in governmental or EU regulations on trade, changes in the exchange rate of the euro (the common currency of certain EU countries), the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the economies of EU member countries and their trading partners. The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns or rising government debt levels in several European countries, including Greece, Ireland, Italy, Portugal and Spain. These events have adversely affected the exchange rate of the euro and may continue to significantly affect every country in Europe, including countries that do not use the euro.

Responses to the financial problems by European governments, central banks and others, including austerity measures and reforms, may not produce the desired results, may result in social unrest and may limit future growth and economic recovery or have other unintended consequences. Further defaults or restructurings by governments and other entities of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro and/or withdraw from the EU. For example, on January 31, 2020, the United Kingdom (“UK”) formally withdrew from the EU (commonly referred to as “Brexit”) and, after a transition period, left the EU single market and customs union under the terms of a new trade agreement on December 31, 2020. The agreement governs the new relationship between the UK and EU with respect to trading goods and services, but critical aspects of the relationship remain unresolved and subject to further negotiation and agreement. Certain aspects of Brexit have had an adverse impact on the region, leading to increased inflation, labor shortages and business closures, among others. The full scope and nature of the consequences of the exit are not at this time known and are unlikely to be known for a significant period of time. It is also unknown whether the UK's exit will increase the likelihood of other countries also departing the EU. Any exits from the EU, or the possibility of such exits, may have a significant impact on the UK, Europe, and global economies, which may result in increased volatility and illiquidity, new legal and regulatory uncertainties and potentially lower economic growth for such economies that could potentially have an adverse effect on the value of the Fund's investments. In addition, a number of countries in Europe have suffered terrorist attacks and additional attacks may occur in the future. Such attacks may cause uncertainty in financial markets and may adversely affect the performance of the issuers to which the Fund has exposure.

Japan. The growth of Japan's economy has historically lagged that of its Asian neighbors and other major developed economies. The Japanese economy is heavily dependent on international trade and has been adversely affected by trade tariffs, other protectionist measures, competition from emerging economies and the economic conditions of its trading partners. China has become an important trading partner with Japan, yet the countries' political relationship has become strained. Should political tension increase, it could adversely affect the economy, especially the export sector, and destabilize the region as a whole. Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy. The Japanese economy faces several other concerns, including a financial system with large levels of nonperforming loans, over-leveraged corporate balance sheets, extensive cross-ownership by major corporations, a changing corporate governance structure, and large government deficits. These issues may cause a slowdown of the Japanese economy. The Japanese yen has fluctuated widely at times and any increase in its value may cause a decline in exports that could weaken the Japanese economy. Japan has, in the past, intervened in the currency markets to attempt to maintain or reduce the value of the yen. Japanese intervention in the currency markets could cause the value of the yen to fluctuate sharply and unpredictably and could cause losses to investors. Japan has an aging workforce and has experienced a significant population decline in recent years. Japan's labor market appears to be undergoing fundamental structural changes, as a labor market traditionally accustomed to lifetime employment adjusts to meet the need for increased labor mobility, which may adversely affect Japan's economic competitiveness.

United Kingdom. The UK has one of the largest economies in Europe, and the United States and other European countries are substantial trading partners of the UK. As a result, the British economy may be impacted by changes to the economic condition of the United States and other European countries. The British economy relies heavily on the export of financial services to the United States and other European countries and, therefore, a prolonged slowdown in the financial services sector may have a negative impact on the British economy. Continued governmental involvement or control in certain sectors may stifle competition in certain sectors or cause adverse effects on eco

nomic growth. In the past, the UK has been a target of terrorism. Acts of terrorism in the UK or against British interests abroad may cause uncertainty in the British financial markets and adversely affect the performance of the issuers to which a Fund has exposure.

Indexing Strategy/Index Tracking Risk. The Fund is managed with an indexing investment strategy, attempting to track the performance of an unmanaged index of securities. The Fund will seek to replicate Index returns, regardless of the current or projected performance of the Index or of the actual securities comprising the Index. This differs from an actively-managed fund, which typically seeks to outperform a benchmark index. The Fund generally will buy and will not sell a security included in the Index as long as the security is part of the Index regardless of any sudden or material decline in value or foreseeable material decline in value of the security, even though the Adviser may make a different investment decision for other actively managed accounts or portfolios that hold the security. As a result, a Fund's performance may be less favorable than that of a portfolio managed using an active investment strategy. The structure and composition of the Index will affect the performance, volatility, and risk of the Index (in absolute terms and by comparison with other indices) and, consequently, the performance, volatility, and risk of a Fund. Errors in index data, index computations or the construction of the Index in accordance with its methodology may occur from time to time and may not be identified and corrected by the Index Provider for a period of time or at all, which may have an adverse impact on a Fund and its shareholders. While the Adviser seeks to track the performance of the Index (i.e., achieve a high degree of correlation with the Index), a Fund's return may not match the return of the Index for a number of reasons. For example, the return on the sample of securities purchased by a Fund (or the return on securities not included in the Index) to replicate the performance of the Index may not correlate precisely with the return of the Index. The Fund incurs a number of operating expenses not applicable to the Index, and incurs costs in buying and selling securities. In addition, a Fund may not be fully invested at times, either as a result of cash flows into or out of the Fund or reserves of cash held by the Fund to meet redemptions. The Adviser may attempt to track the Index return by investing in fewer than all of the securities in the Index, or in some securities not included in the Index, potentially increasing the risk of divergence between a Fund's return and that of the Index. Changes in the composition of the Index and regulatory requirements also may impact a Fund's ability to match the return of the Index. The Adviser may apply one or more “screens” or investment techniques to refine or limit the number or types of issuers included in the Index in which a Fund may invest. Application of such screens or techniques may result in investment performance below that of the Index and may not produce results expected by the Adviser. Index tracking risk may be heightened during times of increased market volatility or other unusual market conditions.

Large-Capitalization Securities Risk. Securities issued by large-capitalization companies may present risks not present in smaller companies. For example, larger companies may be unable to respond as quickly as smaller and mid-sized companies to competitive challenges or to changes in business, product, financial, or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and mid-sized companies, especially during strong economic periods. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies.

Large Shareholder Risk. To the extent a large proportion of the shares of a Portfolio are highly concentrated or held by a small number of shareholders (or a single shareholder), including funds or accounts over which the Adviser has investment discretion, a Portfolio is subject to the risk that these shareholders will purchase or redeem Portfolio shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. These transactions could adversely affect the ability of a Portfolio to conduct its investment program. For example, they could require a Portfolio to sell portfolio securities or purchase portfolio securities unexpectedly and incur substantial transaction costs and/or accelerate the realization of taxable income and/or gains to shareholders, or a Portfolio may be required to sell its more liquid portfolio investments to meet a large redemption, in which case a Portfolio's remaining assets may be less liquid, more volatile, and more difficult to price. A Portfolio may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns.

Leveraging Risk. Borrowing transactions, reverse repurchase agreements, certain derivatives transactions, securities lending transactions and other investment transactions such as when-issued, delayed-delivery, or forward commitment transactions may create investment leverage. If a Fund engages in transactions that have a leveraging effect on the Fund's investment portfolio, the value of the Fund will be potentially more volatile and all other risks will tend to be compounded. This is because leverage generally creates investment risk with respect to a larger base of assets than a Fund would otherwise have and so magnifies the effect of any increase or decrease in the value of the Fund's underlying

assets. The use of leverage is considered to be a speculative investment practice and may result in losses to a Fund. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The use of leverage may cause a Fund to liquidate positions when it may not be advantageous to do so to satisfy repayment, interest payment, or margin obligations.

Liquidity Risk. Liquidity risk is the risk that a Fund may not be able to dispose of investments readily at a favorable time or prices (or at all) or at prices approximating those at which a Fund currently values them. For example, certain investments may be subject to restrictions on resale, may trade in the over-the-counter market or in limited volume, or may not have an active trading market. Illiquid investments may trade at a discount from comparable, more liquid investments and may be subject to wide fluctuations in market value. It may be difficult for a Fund to value illiquid investments accurately. The market for certain investments may become illiquid under adverse market or economic conditions independent of any specific adverse changes in the conditions of a particular issuer. Disposal of illiquid investments may entail registration expenses and other transaction costs that are higher than those for liquid investments. A Fund may seek to borrow money to meet its obligations (including among other things redemption obligations) if it is unable to dispose of illiquid investments, resulting in borrowing expenses and possible leveraging of the Fund. In some cases, due to unanticipated levels of illiquidity a Fund may choose to meet its redemption obligations wholly or in part by distributions of assets in-kind.

The term “illiquid investments” for this purpose means securities that a Fund reasonably expects cannot be sold or disposed of in current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the securities. If any Fund determines at any time that it owns illiquid investments in excess of 15% of its net assets, it will cease to undertake new commitments to acquire illiquid investments until its holdings are no longer in excess of 15% of its NAV, report the occurrence in compliance with Rule 30b1-10 under the 1940 Act and, depending on circumstances, may take additional steps to reduce its holdings of illiquid investments. The SEC has recently proposed rule amendments that, if adopted as proposed, could result in a larger percentage of the Fund's investments being classified as illiquid investments.

Market Disruption and Geopolitical Risk. A Fund is subject to the risk that geopolitical events will disrupt securities markets and adversely affect global economies and markets. War, terrorism, and related geopolitical events have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on U.S. and world economies and markets generally. Likewise, natural and environmental disasters, pandemics and epidemics, and systemic market dislocations may be highly disruptive to economies and markets. Those events, as well as other changes in foreign and domestic economic and political conditions, also could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, credit ratings, inflation, investor sentiment, and other factors affecting the value of a Fund's investments. Given the increasing interdependence among global economies and markets, conditions in one country, market, or region might adversely affect markets, issuers, and/or foreign exchange rates in other countries, including the U.S. Any partial or complete dissolution of the EMU, or any increased uncertainty as to its status, could have significant adverse effects on currency and financial markets, and on the values of a Fund's investments. On January 31, 2020, the United Kingdom (“UK”) formally withdrew from the European Union (“EU”) (commonly known as “Brexit”). An agreement between the UK and the EU governing their future trade relationship became effective January 1, 2021, but critical aspects of the relationship remain unresolved and subject to further negotiation and agreement. There is still considerable uncertainty relating to the potential consequences associated with the exit, how the negotiations for new trade agreements will be conducted, and whether the UK's exit will increase the likelihood of other countries also departing the EU. Brexit may have a significant impact on the UK, Europe, and global economies, which may result in increased volatility and illiquidity, new legal, political, economic and regulatory uncertainties and potentially lower economic growth for these economies that could potentially have an adverse effect on the value of the Portfolio's investments. Any further exits from the EU, or the possibility of such exits, or the abandonment of the euro, may cause additional market disruption globally and introduce new legal and regulatory uncertainties.

Securities and financial markets may be susceptible to market manipulation or other fraudulent trade practices, which could disrupt the orderly functioning of these markets or adversely affect the values of investments traded in these markets, including investments held by a Fund. To the extent a Fund has focused its investments in the market or index of a particular region, adverse geopolitical and other events could have a disproportionate impact on the Fund.

Market Risk. Market prices of investments held by a Fund will go up or down, sometimes rapidly or unpredictably. A Fund's investments are subject to changes in general economic conditions, general market fluctuations and the risks inherent in investment in securities markets. Investment markets can be volatile, and prices of investments can change substantially

due to various factors, including, but not limited to, economic growth or recession, changes in interest rates, inflation, changes in actual or perceived creditworthiness of issuers and general market liquidity. Even if general economic conditions do not change, the value of an investment in a Fund could decline if the particular industries, sectors or companies in which the Fund invests do not perform well or are adversely affected by events. Further, legal, political, regulatory and tax changes also may cause fluctuations in markets and securities prices. Local, regional or global events such as war, military conflicts, acts of terrorism, natural disasters, public health issues, or other events could have a significant impact on a Fund and its investments. Due to the interconnectedness of economies and financial markets throughout the world, if a Fund invests in securities of issuers located in or with significant exposure to countries experiencing economic and financial difficulties, the value and liquidity of the Fund's investments may be negatively affected. A widespread outbreak of an infectious illness, such as COVID-19, and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity of certain instruments, disruption in the trading of certain instruments, and systemic economic weakness. The foregoing could impact a Fund and its investments and result in disruptions to the services provided to a Fund by its service providers.

Additionally, in the spring of 2023, the shutdown of certain financial institutions raised economic concerns over disruption in the U.S. banking system. There can be no certainty that the actions taken by the U.S. government to strengthen public confidence in the U.S. banking system will be effective in mitigating the effects of financial institution failures on the economy and restoring public confidence in the U.S. banking system.

Market Volatility; Government Intervention Risk. Market dislocations and other external events, such as the failures or near failures of significant financial institutions, dislocations in investment or currency markets, corporate or governmental defaults or credit downgrades, or poor collateral performance, may subject a Fund to significant risk of substantial volatility and loss. Governmental and regulatory authorities have taken, and may in the future take, actions to provide or arrange credit supports to financial institutions whose operations have been compromised by credit market dislocations and to restore liquidity and stability to financial systems in their jurisdictions; the implementation of such governmental interventions and their impact on both the markets generally and a Fund's investment program in particular can be uncertain. Governmental and non-governmental issuers may default on, or be forced to restructure, their debts, and other issuers may face difficulties obtaining credit. Defaults or restructurings by governments or others of their debts could have substantial adverse effects on economies, financial markets, and asset valuations around the world. Federal Reserve or other U.S. or non-U.S. governmental or central bank actions, including interest rate increases or contrary actions by different governments, or investor perception that these efforts are not succeeding, could negatively affect financial markets generally as well as the values and liquidity of certain securities.

Master/Feeder Structure Risk (principal risk for the International Developed Equity Index Fund). The Fund pursues its objective by investing substantially all of its assets in another pooled investment vehicle (a “master fund”). The ability of a Fund to meet its investment objective is directly related to the ability of the master fund to meet its investment objective. The ability of a Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the master fund. The ability of a Fund to meet redemption requests will depend on its ability to redeem its interest in the master fund. The Adviser or an affiliate serves as investment adviser to the master fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the master fund. Investment by a Fund in the master fund may be beneficial in the management of the master fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by a Fund directly in portfolio securities, or may have an incentive to invest in such master fund over a master fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a master fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a master fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so. A Fund will bear its pro rata portion of the expenses incurred by the master fund.

Mid-Capitalization Securities Risk. The securities of mid-capitalization companies may be more volatile and may involve more risk than the securities of larger companies. These companies may have limited product lines, markets or financial resources, may lack the competitive strength of larger companies, and may depend on a few key employees. In addition, these companies may have been recently organized and may have little or no track record of success. The securities of mid-sized companies may trade less frequently and in smaller volumes than more widely held securities. The prices of these securities may fluctuate more sharply than those of other securities, and a Fund may experience some difficulty in establishing or closing out positions in these securities at prevailing market prices. There may be less publicly avail

able information about the issuers of these securities or less market interest in these securities than in the case of larger companies, both of which can cause significant price volatility. Some securities of mid-sized issuers may be illiquid or may be restricted as to resale. Returns on investments in securities of mid-capitalization companies could trail the returns on investments in securities of larger or smaller companies.

Non-U.S. Securities Risk. Investments in securities of non-U.S. issuers (including depositary receipts) entail risks not typically associated with investing in securities of U.S. issuers. Similar risks may apply to securities traded on a U.S. securities exchange that are issued by entities with significant exposure to non-U.S. countries. In certain countries, legal remedies available to investors may be more limited than those available with regard to U.S. investments. Because non-U.S. securities are typically denominated and traded in currencies other than the U.S. dollar, the value of the Fund's assets, to the extent they are non-U.S. dollar denominated, may be affected favorably or unfavorably by currency exchange rates, exchange control regulations, and restrictions or prohibitions on the repatriation of non-U.S. currencies. Income and gains with respect to investments in certain countries may be subject to withholding and other taxes. There may be less information publicly available about a non-U.S. entity than about a U.S. entity, and many non-U.S. entities are not subject to accounting, auditing, and financial reporting standards, regulatory framework and practices comparable to those in the United States. The securities of some non-U.S. entities are less liquid and at times more volatile than securities of comparable U.S. entities, and could become subject to sanctions or embargoes that adversely affect a Fund's investment. Non-U.S. transaction costs, such as brokerage commissions and custody costs may be higher than in the U.S. In addition, there may be a possibility of nationalization or expropriation of assets, imposition of currency exchange controls, confiscatory taxation, and diplomatic developments that could adversely affect the values of a Fund's investments in certain non-U.S. countries. Investments in securities of non-U.S. issuers also are subject to foreign political and economic risk not associated with U.S. investments, meaning that political events (civil unrest, national elections, changes in political conditions and foreign relations, imposition of exchange controls and repatriation restrictions), social and economic events (labor strikes, rising inflation) and natural disasters occurring in a country where a Fund invests could cause the Fund's investments to experience gains or losses.

Risk of Investment in Other Pools. When a Fund invests in another pooled investment vehicle, it is exposed to the risk that the other pool will not perform as expected. A Fund is exposed indirectly to all of the risks applicable to an investment in such other pool. In addition, lack of liquidity in the underlying pool could result in its value being more volatile than the underlying portfolio of securities, and may limit the ability of a Fund to sell or redeem its interest in the pool at a time or at a price it might consider desirable. The investment policies and limitations of the other pool may not be the same as those of the Fund; as a result, the Fund may be subject to additional or different risks, or may achieve a reduced investment return, as a result of its investment in another pool. If a pool is an exchange-traded fund or other product traded on a securities exchange or otherwise actively traded, its shares may trade at a premium or discount to their NAV, an effect that might be more pronounced in less liquid markets. A Fund bears its proportionate share of the fees and expenses of any pool in which it invests. The Adviser or an affiliate may serve as investment adviser to a pool in which the Fund may invest, leading to potential conflicts of interest. For example, the Adviser or its affiliates may receive fees based on the amount of assets invested in the pool. Investment by a Fund in the pool may be beneficial to the Adviser or an affiliate in the management of the pool, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest a Fund's assets in a pool sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in the pool over a pool sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by a Fund in a pool sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a pool sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which a Fund does so.

Settlement Risk. Markets in different countries have different clearance and settlement procedures and in certain markets there have been times when settlements have been unable to keep pace with the volume of transactions. Delays in settlement may increase credit risk to a Fund, limit the ability of a Fund to reinvest the proceeds of a sale of securities, hinder the ability of a Fund to lend its portfolio securities, and potentially subject a Fund to penalties for its failure to deliver to on-purchasers of securities whose delivery to a Fund was delayed. Delays in the settlement of securities purchased by a Fund may limit the ability of a Fund to sell those securities at times and prices it considers desirable, and may subject a Fund to losses and costs due to its own inability to settle with subsequent purchasers of the securities from it. A Fund may be required to borrow monies it had otherwise expected to receive in connection with the settlement of securities sold by it, in order to meet its obligations to others. Limits on the ability of a Fund to purchase or sell securities due to settlement delays could increase any variance between a Fund's performance and that of its benchmark index.

Underlying Fund Risk (principal risk for the Hedged International Developed Equity Index Fund). The Fund currently intends to gain all of its investment exposure to, and track the performance of, the Index constituents by investing in another pooled investment vehicle (an “underlying fund”). The ability of the Fund to meet its investment objective with respect to the Index constituents is directly related to the ability of the underlying fund to meet its investment objective. The ability of the Fund to meet its objective may be adversely affected by the purchase and redemption activities of other investors in the underlying fund. The ability of the Fund to meet redemption requests will depend on its ability to redeem its interest in the underlying fund. The Adviser serves as investment adviser to the underlying fund, leading to potential conflicts of interest. For example, the Adviser or its affiliates will receive fees based on the amount of assets invested in the underlying fund. Investment by the Fund in the underlying fund may be beneficial in the management of the underlying fund, by helping to achieve economies of scale or enhancing cash flows. Due to this and other factors, the Adviser may have an incentive to invest the Fund's assets in a master fund sponsored or managed by the Adviser or its affiliates in lieu of investments by the Fund directly in portfolio securities, or may have an incentive to invest in such underlying fund over a underlying fund sponsored or managed by others. Similarly, the Adviser may have an incentive to delay or decide against the sale of interests held by the Fund in a underlying fund sponsored or managed by the Adviser or its affiliates. It is possible that other clients of the Adviser or its affiliates will purchase or sell interests in a underlying fund sponsored or managed by the Adviser or its affiliates at prices and at times more favorable than those at which the Fund does so. The Fund will bear its pro rata portion of the expenses incurred by the underlying fund.

Valuation Risk. Some portfolio holdings, potentially a large portion of a Fund's investment portfolio, may be valued on the basis of factors other than market quotations. This may occur more often in times of market turmoil or reduced liquidity. There are multiple methods that can be used to value a portfolio holding when market quotations are not readily available. The value established for any portfolio holding at a point in time might differ from what would be produced using a different methodology or if it had been priced using market quotations. Portfolio holdings that are valued using techniques other than market quotations, including “fair valued” securities, may be subject to greater fluctuation in their valuations from one day to the next than if market quotations were used. Technological issues or other service disruption issues involving third-party service providers may cause a Fund to value its investments incorrectly. In addition, there is no assurance that a Fund could sell or close out a portfolio position for the value established for it at any time, and it is possible that a Fund would incur a loss because a portfolio position is sold or closed out at a discount to the valuation established by a Fund at that time. Investors who purchase or redeem Fund Shares on days when the Fund is holding fair-valued investments may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the Fund had not fair-valued the holding(s) or had used a different valuation methodology.

Additional Information About Non-Principal Investment Strategies and Risks

Conflicts of Interest Risk. An investment in a Fund will be subject to a number of actual or potential conflicts of interest. For example, the Adviser or its affiliates may provide services to a Fund, such as securities lending agency services, custodial, administrative, bookkeeping, and accounting services, transfer agency and shareholder servicing, securities brokerage services, and other services for which the Fund would compensate the Adviser and/or such affiliates. The Funds may invest in other pooled investment vehicles sponsored, managed, or otherwise affiliated with the Adviser. There is no assurance that the rates at which a Fund pays fees or expenses to the Adviser or its affiliates, or the terms on which it enters into transactions with the Adviser or its affiliates will be the most favorable available in the market generally or as favorable as the rates the Adviser or its affiliates make available to other clients. Because of its financial interest, the Adviser will have an incentive to enter into transactions or arrangements on behalf of a Fund with itself or its affiliates in circumstances where it might not have done so in the absence of that interest, provided that the Adviser will comply with applicable regulatory requirements.

The Adviser and its affiliates serve as investment adviser to other clients and may make investment decisions that may be different from those that will be made by the Adviser on behalf of the Funds. For example, the Adviser may provide asset allocation advice to some clients that may include a recommendation to invest in or redeem from particular issuers while not providing that same recommendation to all clients invested in the same or similar issuers. The Adviser may (subject to applicable law) be simultaneously seeking to purchase (or sell) investments for a Fund and to sell (or purchase) the same investment for accounts, funds, or structured products for which it serves as asset manager, or for other clients or affiliates. The Adviser and its affiliates may invest for clients in various securities that are senior, pari passu or junior to, or have interests different from or adverse to, the securities that are owned by a Fund. The Adviser or its affili

ates, in connection with its other business activities, may acquire material nonpublic confidential information that may restrict the Adviser from purchasing securities or selling securities for itself or its clients (including the Funds) or otherwise using such information for the benefit of its clients or itself.

The foregoing does not purport to be a comprehensive list or complete explanation of all potential conflicts of interests which may affect a Fund. A Fund may encounter circumstances, or enter into transactions, in which conflicts of interest that are not listed or discussed above may arise.

Cybersecurity Risk. With the increased use of technologies such as the Internet and the dependence on computer systems to perform business and operational functions, funds (such as the Funds and the Portfolio) and their service providers (including the Adviser) may be prone to operational and information security risks resulting from cyber-attacks and/or technological malfunctions. In addition, the global spread of COVID-19 caused the Fund and its service providers to implement business continuity plans, including widespread use of work-from-home arrangements. Furthermore, geopolitical tensions may have increased the scale and sophistication of deliberate cybersecurity attacks, particularly those from nation-states or from entities with nation-state backing. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website, releasing confidential information without authorization, and causing operational disruption. Successful cyber-attacks against, or security breakdowns of, a Fund, the Adviser or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect a Fund or its shareholders. For instance, cyber-attacks or technical malfunctions may interfere with the processing of shareholder or other transactions, affect a Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject a Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Cyber-attacks or technical malfunctions may render records of Fund assets and transactions, shareholder ownership of Fund Shares, and other data integral to the functioning of a Fund inaccessible or inaccurate or incomplete. A Fund may also incur substantial costs for cybersecurity risk management in order to prevent cyber incidents in the future. A Fund and its shareholders could be negatively impacted as a result. While the Adviser has established business continuity plans and systems designed to minimize the risk of cyber-attacks through the use of technology, processes and controls, there are inherent limitations in such plans and systems, including the possibility that certain risks have not been identified, given the evolving nature of this threat. Each Fund relies on third-party service providers for many of its day-to-day operations, and will be subject to the risk that the protections and protocols implemented by those service providers will be ineffective to protect the Fund from cyber-attack. The Adviser does not control the cybersecurity plans and systems put in place by third-party service providers, and such third-party service providers may have limited indemnification obligations to the Adviser or the Funds. Similar types of cybersecurity risks or technical malfunctions also are present for issuers of securities in which each Fund invests, which could result in material adverse consequences for such issuers, and may cause a Fund's investment in such securities to lose value.

Index Construction Risk. A security included in an Index may not exhibit the characteristic or provide the specific exposure for which it was selected and consequently a Fund's holdings may not exhibit returns consistent with that characteristic or exposure.

Index Licensing Risk. It is possible that the license under which the Adviser or a Fund is permitted to replicate or otherwise use an Index will be terminated or may be disputed, impaired or cease to remain in effect. In such a case, the Adviser may be required to replace the Index with another index which it considers to be appropriate in light of the investment strategy of a Fund. The use of any such substitute index may have an adverse impact on a Fund's performance. In the event that the Adviser is unable to identify a suitable replacement for the Index, it may determine to terminate a Fund.

Money Market Fund Investment Risk. An investment in a money market fund is not a deposit of any bank and is not insured or guaranteed by the FDIC or any other government agency. Certain money market funds seek to preserve the value of their shares at $1.00 per share, although there can be no assurance that they will do so, and it is possible to lose money by investing in such a money market fund. A major or unexpected change in interest rates or a decline in the credit quality of an issuer or entity providing credit support, an inactive trading market for money market instruments, or adverse market, economic, industry, political, regulatory, geopolitical, and other conditions could cause the share price of such a money market fund to fall below $1.00. It is possible that such a money market fund will issue and redeem shares at $1.00 per share at times when the fair value of the money market fund's portfolio per share is more or less than $1.00. The SEC has adopted amendments to money market fund regulation that, among other things, increase the

daily and weekly liquid asset requirements. Such amendments may limit the Funds' investment flexibility and reduce its ability to generate returns. None of State Street Corporation, State Street Bank and Trust Company (“State Street”), State Street Global Advisors (“SSGA”), SSGA FM or their affiliates (“State Street Entities”) guarantee the value of an investment in a money market fund at $1.00 per share. Investors should have no expectation of capital support to a money market fund from State Street Entities. Other money market funds price and transact at a “floating” NAV that will fluctuate along with changes in the market-based value of fund assets. Shares sold utilizing a floating NAV may be worth more or less than their original purchase price. Recent changes in the regulation of money market funds may affect the operations and structures of money market funds. A money market fund may be permitted or required to impose redemption fees during times of market stress.

Securities Lending Risk. Each Fund may lend portfolio securities in an amount not to exceed 40% of the value of its net assets. For these purposes, net assets shall exclude the value of all assets received as collateral for the loan. Such loans may be terminated at any time. Any such loans must be continuously secured by collateral (either cash or other obligations as may be permitted under the Funds' securities lending program) maintained on a current basis in an amount at least equal to the market value of the securities loaned by a Fund, marked to market each trading day. A Fund will receive the amount of all dividends, interest and other distributions on the loaned securities; however, the borrower has the right to vote the loaned securities. A Fund will call loans to vote proxies if a material issue affecting the investment is to be voted upon. Efforts to recall such securities promptly may be unsuccessful, especially for foreign securities or thinly traded securities. Securities lending involves the risk that the Fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. Should the borrower of the securities fail financially, a Fund may experience delays in recovering the securities or exercising its rights in the collateral. Loans are made only to borrowers that are deemed by the securities lending agent to be of good financial standing. In a loan transaction, a Fund will also bear the risk of any decline in value of securities acquired with cash collateral. Each Fund expects to invest cash collateral in a pooled investment vehicle advised by the Adviser (e.g., a mutual fund or exchange-traded fund). With respect to index funds, to the extent the collateral provided or investments made with cash collateral differ from securities included in the relevant Index, such collateral or investments may have a greater risk of loss than the securities included in the Index. In addition, a Fund will be subject to the risk that any income generated by reinvesting cash collateral is lower than any fees the Fund has agreed to pay a borrower.

Portfolio Holdings Disclosure

The Funds' portfolio holdings disclosure policy is described in the Statement of Additional Information (“SAI”).

Management and Organization

Each Fund is a separate, diversified 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.

The International Developed Equity Index Fund invests through a “master-feeder” structure. The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Portfolio, a separate mutual fund, that has substantially similar investment strategies and risks as the Fund. Descriptions of the investment activities of the Fund also generally describe the expected investment activities of the Portfolio. The Hedged International Developed Equity Index Fund gains all of its investment exposure to the Index constituents by investing in the Portfolio, a separate mutual fund that, aside from the currency hedging activities performed by the Fund, has substantially similar investment strategies and risks as the Fund. Descriptions of the investment activities of the Fund also generally describe the expected investment activities of the Portfolio. Either Fund can withdraw its investment in the Portfolio if, at any time, the Fund's Board of Trustees determines that it would be in the best interests of the Fund's shareholders, or if the investment objectives or strategies of the Portfolio changed so that they were inconsistent with the objectives or strategies of the Fund. If a Fund withdraws its investment from the Portfolio, the Fund may invest all of its assets in another mutual fund that has substantially similar investment strategies to those of the Fund, the Adviser may directly manage the Fund's assets, or the Board may take such other action it deems appropriate and in the best interests of shareholders of the Fund, which may include liquidation of the Fund.

Investment Adviser

SSGA FM serves as the investment adviser to each Fund and, subject to the oversight of the Board, is responsible for the investment management of each Fund. The Adviser provides an investment management program for each Fund and manages the investment of each Fund's assets. In addition, the Adviser provides administrative, compliance and general management services to each Fund. The Adviser is a wholly-owned subsidiary of State Street Global Advisors, Inc., which itself is a wholly-owned subsidiary of State Street Corporation. The Adviser is registered with the U.S. Securities and Exchange Commission (“SEC”) under the Investment Advisers Act of 1940, as amended. The Adviser and certain other affiliates of State Street Corporation make up SSGA. SSGA is one of the world's largest institutional money managers and the investment management arm of State Street Corporation. As of December 31, 2023, the Adviser managed approximately $955.79 billion in assets and SSGA managed approximately $4.13 trillion in assets. The Adviser's principal business address is One Iron Street, Boston, Massachusetts 02210.

Each Fund has entered into an investment advisory agreement with the Adviser, pursuant to which the Adviser will manage the Fund's assets for compensation paid at the annual rate, set forth below, of the Fund's average daily net assets.

State Street Hedged International Developed Equity Index Fund	0.14%
State Street International Developed Equity Index Fund	0.11%

The amount each Fund pays under its Investment Advisory Agreement is reduced by the amount of the advisory fee it bears indirectly through its investment in the Portfolio. For the services provided under its Investment Advisory Agreement, the Portfolio pays the Adviser a management fee at an annual rate of 0.11% of the Portfolio's average daily net assets.

Total Annual Fund Operating Expense Waiver. For the Hedged International Developed Equity Index Fund, SSGA FM, as the investment adviser to the Fund, is contractually obligated, through April 30, 2025, (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees other than the fees of the Portfolio, and any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.15% of average daily net assets on an annual basis. Additionally, for the International Developed Equity Index Fund, SSGA FM, as the investment adviser to the Fund, is contractually obligated, through April 30, 2025, (i) to waive up to the full amount of the advisory fee payable by the Fund, and/or (ii) to reimburse the Fund for expenses to the extent that Total Annual Fund Operating Expenses (exclusive of non-recurring account fees, interest, taxes, extraordinary expenses, acquired fund fees, and any class-specific expenses, such as distribution, shareholder servicing, sub-transfer agency and administration fees) exceed 0.09% of average daily net assets on an annual basis. These waiver and/or reimbursement arrangements may not be terminated prior to April 30, 2025 except with approval of the Funds' Board of Trustees.

A discussion regarding the Board's consideration of the Funds' Investment Advisory Agreement is provided in the Fund's Semi-Annual Report to Shareholders for the period ended June 30, 2023 for the Hedged International Developed Equity Index Fund and, for the International Developed Equity Index Fund, will be included in that Fund's annual report or semi-annual report, as applicable, after that Fund commences operations.

The Adviser manages the Funds using a team of investment professionals. The team approach is used to create an environment that encourages the flow of investment ideas. The portfolio managers within the team work together in a cohesive manner to develop and enhance techniques that drive the investment process for the respective investment strategy. This approach requires portfolio managers to share a variety of responsibilities, including investment strategy and analysis, while retaining responsibility for the implementation of the strategy within any particular portfolio. The approach also enables the team to draw upon the resources of other groups within SSGA. Each portfolio management team is overseen by the SSGA Investment Committee.

Key professionals involved in the day-to-day portfolio management of the Funds include the following:

David Chin is a Vice President of SSGA and the Adviser and a Senior Portfolio Manager in the Global Equity Beta Solutions Group. He is responsible for managing a full range of equity index and tax-efficient products. Prior to joining SSGA in 1999, Mr. Chin worked at Frank Russell Company, OneSource Information Systems, and PanAgora Asset Management. Mr. Chin has been working in the investment management field since 1992. Mr. Chin holds a Bachelor of Science in Management Information Systems from the University of Massachusetts/Boston and a Master of Business Administration from the University of Arizona.

Karl Schneider, CAIA, is a Managing Director of SSGA and the Adviser and Head of Traditional Beta Strategies for the Global Equity Beta Solutions (GEBS) Group in the Americas. He also serves as a Senior Portfolio Manager for a number of the group's index equity portfolios. Previously within the GEBS Group, he was the Deputy Head of the Americas, and prior to that served as a portfolio manager and product specialist for U.S. equity strategies and synthetic beta strategies, including commodities, buy/write, and hedge fund replication. He is a voting member of the firm's North America Product Committee and is also a member of the S&P Dow Jones U.S. Equities Index Advisory Panel. Prior to joining the GEBS Group, Mr. Schneider worked as a portfolio manager in SSGA's Currency Management Group, managing both active currency selection and traditional passive hedging overlay portfolios. He joined SSGA in 1997. Mr. Schneider holds a Bachelor of Science in Finance and Investments from Babson College and a Master of Science in Finance from the Carroll School of Management at Boston College. He has earned the Chartered Alternative Investment Analyst (CAIA) designation and is a member of the CAIA Association.

Additional information about the portfolio managers' compensation, other accounts managed by the portfolio managers, and the portfolio managers' ownership of the Funds is available in the SAI.

Other Fund Services

The Administrator, Sub-Administrator and Custodian

The Adviser serves as administrator of each Fund. The amount of the fee paid to the Adviser for administrative services may vary by share class. Each Fund currently pays the Adviser an administrative fee at the annual rate of 0.05% with respect to each of its share classes. State Street, a subsidiary of State Street Corporation, serves as sub-administrator for the Funds for a fee that is paid by the Adviser. State Street also serves as custodian of the Funds for a separate fee that is paid by the Funds. SSGA FM serves as administrator of the Portfolio and State Street serves as sub-administrator and custodian of the Portfolio.

The Transfer Agent and Dividend Disbursing Agent

SS&C GIDS, Inc. is the Funds' transfer agent and dividend disbursing agent (the “Transfer Agent”).

The Distributor

State Street Global Advisors Funds Distributors, LLC serves as the Funds' distributor (“SSGA FD”) pursuant to the Distribution Agreement between SSGA FD and the Trust.

Additional Information

The Trustees of the Trust oversee generally the operations of the Funds and the Trust. The Trust enters into contractual arrangements with various parties, including, among others, the Funds' investment adviser, custodian, transfer agent, and accountants, who provide services to the Funds. Shareholders are not parties to any such contractual arrangements or intended beneficiaries of those contractual arrangements, and those contractual arrangements are not intended to create in any shareholder any right to enforce them directly against the service providers or to seek any remedy under them directly against the service providers.

This Prospectus provides information concerning the Trust and the Funds that you should consider in determining whether to purchase shares of the Funds. Neither this Prospectus, nor the related SAI, is intended, or should be read, to be or to give rise to an agreement or contract between the Trust or the Funds and any investor, or to give rise to any rights in any shareholder or other person other than any rights under federal or state law that may not be waived.

Shareholder Information

Determination of Net Asset Value

Each Fund determines its NAV per share once each business day as of the scheduled close of regular trading on the New York Stock Exchange (the “NYSE”). Pricing does not occur on NYSE holidays. A business day is one on which the NYSE is open for regular trading. The Federal Reserve is closed on certain holidays on which the NYSE is open. These holidays are Columbus Day and Veterans Day. On these holidays, you will not be able to purchase shares by wiring Federal Funds because Federal Funds wiring does not occur on days when the Federal Reserve is closed. In unusual circumstances, such as an emergency or an unscheduled close or halt of trading on the NYSE, the time at which share prices are determined may be changed. The NAV per share is based on the market value of the investments held in a Fund. The NAV of each class of a Fund's Shares is calculated by dividing the value of the assets of the Fund attributable to that class less the liabilities of the Fund attributable to that class by the number of shares in the class outstanding.As noted in this Prospectus, each Fund may invest in securities listed on foreign exchanges, or otherwise traded in a foreign market, and those securities may trade on weekends or other days when each Fund does not price its shares. Consequently, the NAV of each Fund's Shares may change on days when shareholders are not able to purchase or redeem the Fund's Shares. Purchase and redemption orders for Fund Shares are processed, respectively, at the NAV next determined after the Fund accepts a purchase order or receives a redemption request in good form. Each Fund values each security or other investment pursuant to guidelines adopted by the Board. The Board has appointed the Adviser as the valuation designee to fair value securities or other investments pursuant to procedures approved by the Funds' Board, under certain limited circumstances. For example, fair value pricing may be used when market quotations are not readily available or reliable, such as when (i) trading for a security is restricted; or (ii) a significant event, as determined by the Adviser, that may affect the value of one or more securities or other investments held by a Fund occurs after the close of a related exchange but before the determination of a Fund's NAV. Attempts to determine the fair value of securities or other investments introduce an element of subjectivity to the pricing of securities or other investments. As a result, the price of a security or other investment determined through fair valuation techniques may differ from the price quoted or published by other sources and may not accurately reflect the price a Fund would have received had it sold the investment. To the extent that a Fund invests in the shares of other registered open-end investment companies that are not traded on an exchange (mutual funds), such shares are valued at their published NAVs per share as reported by the funds. The prospectuses of these funds explain the circumstances under which the funds will use fair value pricing and the effects of using fair value pricing.

Investing in State Street Institutional Investment Trust Shares

Mutual funds advised by SSGA FM (the “State Street Funds”) and their service providers have a legal obligation to collect from you certain personal information about you at the time you open an account in order to verify your identity and the source of your payment. If you do not provide this information, you may not be able to open an account with the State Street Funds. If the State Street Funds believe that they have uncovered unlawful activity, the State Street Funds and their service providers may close your account and take any action they deem reasonable or required by law. The State Street Funds reserve the right to reject any purchase order.

This section of the Prospectus explains the basics of doing business with the State Street Funds. Carefully read each topic. The policies set forth below regarding the purchase, redemption and exchange of State Street Fund shares are in addition to the “Purchase and Sale of Fund Shares” section contained in the “Fund Summary” portion of this Prospectus. The State Street Funds reserve the right to change the following policies, without notice to shareholders; except that

any modification or termination of the exchange privileges described in this Prospectus will be preceded by 60 days' advance notice to shareholders. Please call or check online for current information. Requests for transactions in the State Street Funds will be processed when they are received in “good order.” “Good order” means that the request is in an accurate and complete form, and all applicable documents have been received in such accurate and complete form (including, typically, a signed application and medallion-guaranteed documents), and, for a purchase request, the check or wired funds have cleared.

Purchasing Shares

The Funds offer one class of shares through this Prospectus: Class K shares, available to you subject to the eligibility requirements set forth below. All classes of the Funds share the same investment objective and investments, but the different share classes have different expense structures and eligibility requirements. You should choose the class with the expense structure that best meets your needs for which you are eligible. In choosing a share class, you should consider the amount you plan to invest. Your investment professional can help you choose the share class that best suits your investment needs.

The chart below summarizes the features of the share class. This chart is only a general summary, and you should read the description of each Fund's expenses in their respective Fund Summaries in this Prospectus.

Any applicable minimum purchase amount may be waived for specific investors or types of investors, including, without limitation, retirement plans, employees of State Street Corporation and its affiliates and their family. In the case of shareholders purchasing shares through a Financial Intermediary, the minimum purchase amount may be applied at the level of the Financial Intermediary.

	Class K
Availability	Limited to certain investors, including certain qualified recordkeepers, financial institutions and employer- sponsored retirement plans.
Minimum Initial Investment	There is no minimum investment for Class K shares.
Maximum Investment	None.
Initial (Front-End) Sales Charge	None. Entire purchase price is invested in shares of a Fund.
Deferred (CDSC) Sales Charge	None.
Distribution and Service (Rule 12b-1) Fees	None.

Class K

Class K shares are not subject to any sales charge. Only certain investors are eligible to buy Class K shares. Your Financial Intermediary can help you determine whether you are eligible to purchase Class K shares.

Class K shares are available to the following categories of investors:

Banks, broker-dealers and other financial institutions (including registered investment advisers and financial planners) purchasing Fund Shares on behalf of their clients in:

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Discretionary and non-discretionary advisory programs;

•

Fund "supermarkets";

•

Asset allocation programs;

•

Other programs in which the client pays an asset-based fee for advice or for executing transactions in Fund Shares or for otherwise participating in the program; or

•

Certain other investment programs that do not charge an asset-based fee;

Qualified recordkeepers with an applicable agreement maintained with SSGA FD;

Endowments and foundations, and defined contribution, defined benefit, and other employer-sponsored employee benefit plans, whether or not qualified under the Code;

Certain other registered open-end investment companies whose shares are distributed by SSGA FD;

Current or retired Directors or Trustees of the State Street Funds, officers and employees of SSGA, and any of its subsidiaries, such persons' spouses, and children under the age of 21, and trust accounts for which any of such person is a beneficiary;

Qualified state tuition plans described in Section 529 of the Code and donor-advised charitable gift funds (subject to all applicable terms and conditions);

Health Savings Accounts under Section 223 of the Code if such accounts are maintained by the Fund at an omnibus level;

Collective investment trusts.

There is no minimum investment for Class K shares.

How to Initiate a Purchase Request

Investing in the State Street Funds Through a Financial Intermediary

If you currently do not have an account with State Street Funds, you may establish a new account and purchase shares through a Financial Intermediary, such as a bank, broker, or investment adviser. Please consult your Financial Intermediary to determine which, if any, shares are available through that firm and to learn about other rules that may apply. You may also submit a New Account Application. To open certain types of accounts, such as IRAs, you will be required to submit an account-specific application. If you intend to add certain investor services offered by the State Street Funds, such as Automatic Investment and Withdrawals Plans, you also will be required to submit a Service Option Form. See Service Options. If you are opening an account through a Financial Intermediary, such as a bank or broker, the Financial Intermediary should have the documents that you will need.

Account Applications and Other Documents. You may find many of the forms necessary to open an account online or by calling or writing to the State Street Funds. See Contacting the State Street Funds.

Opening Accounts and Purchasing By Telephone. You may call the State Street Funds to request that the account-opening forms be sent to you or for assistance in completing the necessary paperwork. Once an account has been established, you may also call the State Street Funds to request a purchase of shares. See Contacting the State Street Funds.

Opening Accounts and Purchasing By Mail. You may send the State Street Funds your account registration form and check to open a new account. To add to an existing account, you may send your check with a written request. You also may send a written request to the State Street Funds to make an exchange. For the State Street Funds' addresses, see Contacting the State Street Funds.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

How to Pay for a Purchase

By Wire. Please call the State Street Funds for instructions and policies on purchasing shares by wire. See Contacting the State Street Funds. All wires should be in U.S. dollars and immediately available funds.

By Check. You may send a check to make initial or additional purchases to your fund account. Make your check payable to “State Street Funds” and include the appropriate fund name and account number (e.g., “State Street Hedged International Developed Equity Index Fund—a/c #xxx”) in the memo section of the check.

By Exchange. You may purchase shares of a State Street Fund, provided the Funds' minimum investment is met, using the proceeds from the simultaneous redemption of shares of another State Street Fund of the same class. You may initiate an exchange by telephone, or by mail. See Exchanging Shares below.

In-Kind Purchase of State Street Fund Shares. The State Street Funds, in their sole discretion, may permit you to purchase shares of a State Street Fund (“State Street Fund Shares”) through the exchange of other securities that you own. The market value of any securities exchanged, plus any cash, must be at least $25 million. Please consult your tax adviser regarding in-kind transactions. Please contact the State Street Funds for more information, including additional restrictions. See Contacting the State Street Funds.

Trade Dates-Purchases

The trade date for any purchase request received in good order will depend on the day and time the State Street Funds receive your request, the manner in which you are paying, and the type of fund you are purchasing. Each State Street Fund's NAV is calculated only on business days, that is, those days that the NYSE is open for regular trading. Purchase orders are processed at the NAV next determined after the Fund accepts a purchase order.

For Purchases by Check, Exchange or Wire into all Funds: If the purchase request is received in good order by the State Street Funds on a business day before the close of regular trading on the NYSE (ordinarily 4 p.m., Eastern time), the trade date will be the same day. If the purchase request is received in good order on a business day after the close of regular trading on the NYSE, or on a non-business day, the trade date will be the next business day.

If your purchase request is not in good order, it may be rejected.

For further information about purchase transactions, consult our website at www.ssga.com or see Contacting the State Street Funds.

Other Purchase Policies You Should Know

Check Purchases. All checks used to purchase State Street Fund Shares must be drawn on a U.S. bank and in U.S. dollars. The State Street Funds will not accept any third-party check used for an initial purchase of Fund Shares, or any check drawn on a credit card account for any purpose.

New Accounts. We are required by law to obtain from you certain personal information that we will use to verify your identity. If you do not provide the information, we may not be able to open your account. If we are unable to verify your identity, the State Street Funds reserve the right, without notice, to close your account or take such other steps as we deem reasonable.

Refused or Rejected Purchase Requests. The State Street Funds reserve the right to stop selling Fund Shares or to reject any purchase request at any time and without notice, including purchases requested by exchange from another State Street Fund. This right also includes the right to reject any purchase request because of a history of frequent trading by the investor or because the purchase may negatively affect a Fund's operation or performance.

Purchases Through Pension Plans. If you are purchasing State Street Fund Shares through a pension or other participation plan, you should contact your plan administrator for further information on purchases.

Redeeming Shares

By Telephone. You may call the State Street Funds to request a redemption of shares. See Contacting the State Street Funds.

By Mail. You may send a written request to the State Street Funds to redeem from a Fund account or to make an exchange. See Contacting the State Street Funds.

If you wish to redeem Fund Shares through a Financial Intermediary, please contact that Financial Intermediary directly. Your Financial Intermediary may have different or additional requirements for the processing of redemption orders, or may be closed at times when the Fund is open. Financial Intermediaries may contact SS&C GIDS, Inc. at (877) 332-6207 or via email at [email protected] with questions.

Please be sure to check Exchanging Shares and Frequent-Trading Limits below.

Trade Date-Redemptions

The trade date for any redemption request received in good order will depend on the day and time the State Street Funds receive your request in good order and the manner in which you are redeeming.

Your redemption will be executed using the NAV as calculated on the trade date. NAVs are calculated only on days that the NYSE is open for regular trading (a business day). If the redemption request is received in good order by the State Street Funds on a business day before the close of regular trading on the NYSE (ordinarily 4 p.m., Eastern time), the request will be processed the same day using that day's NAV. If the redemption request is received in good order on a business day after the close of regular trading on the NYSE, or on a non-business day, the request will be processed the next business day.

How to Receive Redemption Proceeds

Regardless of the method the Funds use to make a redemption payment, the Funds typically expect to pay out redemption proceeds on the next business day after a redemption request is received in good order. If you purchased State Street Fund Shares by check or an automatic investment program and you elect to redeem shares within 15 days of the purchase, you may experience delays in receiving redemption proceeds. In this case, the State Street Funds generally will postpone sending redemption proceeds until it can verify that the check or automatic investment program investment has been collected, but in no event will this delay exceed 15 days. There will be no such delay for redemptions following purchases paid by federal funds wire or by bank cashier's check, certified check or treasurer's check. The State Street Funds reserve the right to pay for redeemed shares within seven days after receiving a redemption order if, in the judgment of the Adviser, an earlier payment could adversely affect a Fund. The State Street Funds reserve the right to suspend the right of shareholder redemption or postpone the date of payment for more than seven days to the extent permitted by the 1940 Act.

The Transfer Agent may temporarily delay for more than seven days the disbursement of redemption proceeds from the Fund account of a “Specified Adult” (as defined in Financial Industry Regulatory Authority, Inc. (“FINRA”) Rule 2165) based on a reasonable belief that financial exploitation of the Specified Adult has occurred, is occurring, has been attempted, or will be attempted, subject to certain conditions.

Under normal circumstances, each Fund expects to meet redemption requests by using cash or cash equivalents in its portfolio and/or selling portfolio assets to generate cash. The Funds also may pay redemption proceeds using cash obtained through borrowing arrangements (including under the Funds' line of credit, which is shared across all registered funds advised by SSGA FM (other than money market funds)) that may be available from time to time.

The right of any investor to receive payment with respect to any redemption may be suspended or the payment of the redemption proceeds postponed beyond 7 days in accordance with Section 22(e) of the 1940 Act and the rules thereunder, including during any period in which the NYSE is closed (other than weekends or holidays) or trading on the NYSE is restricted or if an emergency exists as a result of which disposal by a Fund of securities owned by it is not reasonably practicable or it is not reasonably practicable for a Fund fairly to determine the value of its net assets. In addition, the SEC may by order permit suspension of redemptions for the protection of shareholders of a Fund.

A Fund may pay all or a portion of your redemption proceeds by giving you securities (for example, if the Fund reasonably believes that a cash redemption may have a substantial impact on the Fund and its remaining shareholders). A redemption is generally a taxable event for shareholders, regardless of whether the redemption is satisfied in cash or in kind. You may pay transaction costs (including through the realization of taxable gain) to dispose of the securities, and you may receive less for them than the price at which they were valued for purposes of the redemption. In addition, you will be subject to the market risks associated with such securities until such time as you choose to dispose of the security.

During periods of deteriorating or stressed market conditions, when an increased portion of a Fund's portfolio may be comprised of less liquid investments, or during extraordinary or emergency circumstances, a Fund may be more likely to pay redemption proceeds with cash obtained through short-term borrowing arrangements (if available) or by giving you securities.

By Electronic Bank Transfer. You may have the proceeds of a fund redemption sent directly to a designated bank account. To establish the electronic bank transfer option on an account, you must designate a bank account by completing a special form or filling out the appropriate section of your account registration form. After the option is set up on your account, you can redeem shares by electronic bank transfer on a regular schedule (Automatic Withdrawal Plan) or from time to time. Your redemption request can be initiated by telephone, or by mail.

By Wire. When redeeming shares of a State Street Fund, you may instruct the State Street Funds to wire your redemption proceeds ($1,000 minimum) to a previously designated bank account. Shares will be redeemed from the account on the day that the redemption instructions are received in good order. The wire redemption option is not automatic; you must designate a bank account by completing a special form or filling out the appropriate section of your account registration form. The State Street Funds typically do not charge you a fee for wiring redemption proceeds, although it reserves the right to do so. Your bank may charge a fee for receiving a wire. You are encouraged to check with your bank before initiating any transaction.

By Exchange. You may have the proceeds of a State Street Fund redemption invested directly into shares of another State Street Fund of the same class. You may initiate an exchange by telephone, or by mail.

By Check. You may have the proceeds of a State Street Funds redemption paid by check and sent to the address shown on the State Street Funds registration record, provided that the address on the registration record has not changed within thirty (30) days of the redemption request. The State Street Funds will mail you a redemption check, generally payable to all registered account owners.

Other Redemption Policies that You Should Know

Address Changes. If your address of record has been changed within thirty (30) days of the redemption request, the request must be in writing and bear a medallion guarantee.

Significant/Unusual Economic or Market Activity. During periods of significant or unusual economic or market activity, you may encounter delays attempting to give instructions by phone.

Minimum Account Size. If, due to your redemptions or exchanges, your account balance for a Fund falls below a minimum amount set by the Fund (presently, the minimum initial investment of your selected share class), the Fund may choose to redeem the shares in the account and mail you the proceeds. You will receive 60 days' notice that your account will be closed unless an investment is made to increase the account balance to the required minimum. Failure to bring your account balance to the required minimum within the prescribed period may result in the Fund closing your account at the NAV next determined on the day the account is closed, and mailing the proceeds to you at the address shown on the Fund's records.

Exchanging Shares

An exchange occurs when you use the proceeds from the redemption of shares of one State Street Fund to simultaneously purchase shares of a different State Street Fund. Exchanges may be made within the same class (i.e. Class K shares for Class K shares). Class N shares are also exchangeable for other share classes of State Street Funds and would be subject to the conditions for investing in the other class of shares described in the applicable prospectus. The account holding the original shares must be registered in the same name as the account holding the new shares received in the exchange. You may make exchange requests by telephone, or by mail. See Purchasing Shares and Redeeming Shares above.

Exchanges are subject to the terms applicable to the purchases of the Fund into which you are exchanging. Exchange privileges may not be available for all State Street Funds and may be suspended or rejected. Exchanging shares of a State Street Fund for shares of another fund is a taxable event and may result in capital gain or loss. See Tax Considerations below.

If the NYSE is open for regular trading (generally until 4 p.m. Eastern time, on a business day) at the time an exchange request is received in good order, the trade date generally will be the same day. Please note that the State Street Funds reserve the right to revise or terminate the exchange privilege, limit the amount of any exchange, or reject an exchange, at any time, for any reason; provided, that shareholders will be provided 60 days' advance notice of any modification or termination of the exchange privilege.

Frequent-Trading Limits

Frequent, short-term trading, abusive trading practices and market timing (together, “Excessive Trading”), often in response to short-term fluctuations in the market, are not knowingly permitted by the State Street Funds. The State Street Funds do not accommodate frequent purchases and redemptions of Fund Shares by Fund shareholders. Excessive Trading into and out of a State Street Fund may harm a Fund's performance by disrupting portfolio management strategies and by increasing expenses. These expenses are borne by all Fund shareholders, including long-term investors who do not generate such costs.

Excessive Trading activity is generally evaluated based on roundtrip transactions in an account. A “roundtrip” transaction is defined generally as a purchase or exchange into a Fund followed, or preceded, by a redemption or exchange out of the same Fund within 30 days. A State Street Fund may, in its discretion, determine to apply a time period other than 30 days in connection with identifying roundtrip transactions. Shareholders with one or more roundtrip transactions may, in the discretion of a State Street Fund, be blocked from making additional purchases or exchanges in any State Street

Fund for a period of time. A State Street Fund has discretion to determine that action is not necessary if it determines that a pattern of trading is not abusive or harmful to the affected Fund in a material way. Fund size and/or transaction size may be considered in evaluating any roundtrip transaction.

The Board of Trustees of the State Street Funds has adopted a “Market Timing/Excessive Trading Policy” (the “Policy”) to discourage Excessive Trading. Under the Policy, the State Street Funds reserve the right to reject any exchanges or purchase orders by any shareholder engaging in Excessive Trading activities.

As a means to protect each State Street Fund and its shareholders from Excessive Trading:

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The State Street Funds' transfer agent compiles, monitors and reports account-level information on omnibus and underlying shareholder/participant activity. Depending on the account type, monitoring will be performed on a daily, monthly, quarterly and/or annual basis;

•

The State Street Funds' distributor has obtained information from each Financial Intermediary holding shares in an omnibus account with the State Street Funds regarding whether the Financial Intermediary has adopted and maintains procedures that are reasonably designed to protect the Funds against harmful short-term trading; and

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With respect to State Street Funds that invest in securities that trade on foreign markets, pursuant to the State Street Funds' fair valuation procedures, pricing adjustments may be made based on information received from a third-party, multi-factor fair valuation pricing service.

The State Street Funds' distributor has detailed procedures that document the transparency oversight and monitoring processes performed by the State Street Funds' transfer agent.

While the State Street Funds attempt to discourage Excessive Trading, there can be no guarantee that it will be able to identify investors who are engaging in Excessive Trading or limit their trading practices. Additionally, frequent trades of small amounts may not be detected. The State Street Funds recognize that it may not always be able to detect or prevent Excessive Trading or other activity that may disadvantage the Funds or their shareholders.

A State Street Fund shareholder's right to purchase shares through an automatic investment plan or redeem shares in full (or in part through a systematic withdrawal plan) are unaffected by Excessive Trading restrictions.

Service Options

Dividend and Capital Gain Distribution Option

You may set up your State Street Fund account to reinvest any dividend or capital gains distribution that you receive as a Fund shareholder into the same or a different State Street Fund, or have any dividend or capital gain distribution paid by check, by wire or by check to a special payee. No interest will accrue on the amounts represented by the uncashed distribution checks. If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current NAV of the Fund.

Please refer to Dividends, Distributions and Tax Considerations below for additional information.

Automatic Withdrawal Plan

If your account balance is over $10,000, you may request periodic (monthly, quarterly, semi-annually, or annually) automatic cash withdrawals of $100 or more which can be mailed to you or any person you designate, or sent through ACH to your bank (at your selection). Proceeds from such withdrawals will be transmitted to the bank account you designate two business days after the trade is placed or executed automatically. No interest will accrue on the amounts represented by the uncashed redemption check(s). Ask your financial adviser or Financial Intermediary for details.

Telephone Redemptions and Exchanges

You may set up your State Street Fund account so that if you request over the telephone to redeem State Street Fund Shares, the redemption proceeds will automatically be wired to a designated bank account. You also may set up your account to permit the State Street Funds to act on your telephonic instructions to exchange State Street Funds shares or to establish a systematic exchange plan. You may choose the date, the frequency (monthly, quarterly or annually) of systematic exchanges of your shares in one State Street Fund to another State Street Fund of the same share class.

Automatic Investment Plan

Once the initial investment has been accepted, you may make subsequent investments of $100 or more monthly, quarterly or annually by direct deposit by debiting your bank checking or savings account. Once this option has been established, you may call the State Street Funds to make additional automatic purchases, to change the amount of the existing automatic purchase, or to stop it. Each State Street Fund reserves the right to cancel your automatic investment plan if any correspondence sent by the Fund is returned by the postal or other delivery service as “undeliverable.”

Additional Shareholder Information

Account Transfers

To effect a change in account registration (for example, to add a new joint owner), a shareholder of a State Street Fund may request to open a new account in the same State Street Fund (referred to as a “transfer”). To effect a transfer, the State Street Funds require a completed and signed new account application, including all necessary additional documents required by the form, and a letter of instruction. The letter of instruction must include the name of the State Street Fund and the original account number, and must be signed by all registered owners of the original account and include a medallion guarantee.

Responsibility for Fraud

The State Street Funds will not be responsible for any account losses because of fraud if we reasonably believe that the person transacting business on an account is authorized to do so. Please take precautions to protect yourself from fraud. Keep your account information private, and immediately review any account statements that we provide to you. It is important that you contact the State Street Funds immediately about any transactions or changes to your account that you believe to be unauthorized.

Right to Change Policies

In addition to the rights expressly stated elsewhere in this Prospectus, the State Street Funds reserve the right, in the future, to:

Alter, add, or discontinue any conditions of purchase (including eligibility requirements), redemption, exchange, service, or privilege at any time;

Accept initial purchases by telephone;

Freeze any account and/or suspend account services if the State Street Funds has received reasonable notice of a dispute regarding the assets in an account, including notice of a dispute between the registered or beneficial account owners, or if we reasonably believe a fraudulent transaction may occur or has occurred;

Temporarily freeze any account and/or suspend account services upon initial notification to the State Street Funds of the death of the shareholder until the State Street Funds receive required documentation in good order;

Alter, impose, discontinue, or waive any redemption fee, account service fee, or other fees charged to a group of shareholders; and

Redeem an account or suspend account privileges, without the owner's permission to do so, in cases of threatening conduct or activity the State Street Funds believe to be suspicious, fraudulent, or illegal.

Changes may affect any or all investors. These actions will be taken when, at the sole discretion of the SSGA FM management, we reasonably believe they are deemed to be in the best interest of the State Street Fund.

Unclaimed Property

Many states have unclaimed property rules that provide for transfer to the state (also known as “escheatment”) of unclaimed property under various circumstances. These circumstances include inactivity (e.g., no owner-initiated contact for a certain period), returned mail (e.g., when mail sent to a shareholder is returned by the post office as undeliverable), or a combination of both inactivity and returned mail. If the Funds' transfer agent identifies property as unclaimed, it will attempt to contact the shareholder, but if that attempt is unsuccessful, the account may be considered abandoned and escheated to the state after the passage of a certain period of time (as required by applicable state law).

It is your responsibility to ensure that you maintain a correct address for your account, and maintain contact in ways such as by contacting the Funds' transfer agent by mail or telephone or accessing your account through the Funds' website, and promptly cashing all checks for dividends, capital gains and redemptions. State requirements for maintaining contact with an account can vary and are subject to change. If you invest in a Fund through a financial intermediary, we

encourage you to contact the financial intermediary regarding applicable state unclaimed property laws. The Funds, the transfer agent and the distributor will not be liable to shareholders or their representatives for good faith compliance with state unclaimed property laws. Please check your state's unclaimed or abandoned property website for specific information.

If you are a resident of the state of Texas, you may designate a representative to receive escheatment notifications by completing and submitting a designation form, which you can find on the website of the Texas Comptroller. Designating such a representative may be beneficial, since Texas law provides that the escheatment period will cease if the representative, after receiving an escheatment notification regarding your account, communicates knowledge of your location and confirms that you have not abandoned your account. You can mail a completed designation form to a Fund (if you hold shares directly with a Fund) or to your financial intermediary (if you do not hold shares directly with a Fund).

Dividends, Distributions and Tax Considerations

Dividends of investment income and capital gain distributions of the Funds will be declared and paid at least annually. Any investment income and capital gains that have not been distributed by December of each calendar year are generally distributed at such time. When a Fund distributes investment income or capital gains, the NAV per share is reduced by the amount of the distribution.

Distribution Options. You can choose from four different distribution options as indicated on the application:

•

Reinvestment Option—Dividends and capital gain distributions will be automatically reinvested in additional shares of a Fund. If you do not indicate a choice on the application, this option will be automatically assigned.

•

Income-Earned Option—Capital gain distributions will be automatically reinvested, but a check, direct deposit or wire will be sent for each dividend distribution.

•

Cash Option—A check, wire or direct deposit will be sent for each dividend and capital gain distribution.

•

Direct Dividends Option—Dividends and capital gain distributions will be automatically invested in another identically registered State Street Fund of the same share class.

If you have elected to receive distributions by check, and the postal or other delivery service is unable to deliver the checks because of an incorrect mailing address, or if a distribution check remains uncashed for six months, the uncashed distribution and all future distributions will be reinvested at the then-current net asset value of the Fund.

Dividend Policy Upon Purchase. A shareholder will receive a dividend or capital gain distribution only if the shareholder purchased Fund Shares by the close of the record date of such dividend or capital gain distribution.

Delivery of Documents to Accounts Sharing an Address

To reduce expenses, we may mail only one copy of the Funds' Prospectus and each annual and semi-annual report to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents, please call us at (800) 647-7327, or contact your financial institution. We will begin sending you individual copies thirty (30) days after receiving your request.

Tax Considerations

The following discussion is a summary of some important U.S. federal income tax considerations generally applicable to an investment in a Fund. Your investment in a Fund may have other tax implications. Please consult your tax advisor about federal, state, local, foreign or other tax laws applicable to you. Investors, including non-U.S. investors, may wish to consult the SAI tax section for additional disclosure.

Each Fund has elected to be treated as a regulated investment company and intends each year to qualify and to be eligible to be treated as such. A regulated investment company generally is not subject to tax at the corporate level on income and gains that are timely distributed to shareholders. In order to qualify and be eligible for treatment as a regulated investment company, a Fund must, among other things, satisfy diversification, 90% gross income and distribution requirements. A Fund's failure to qualify as a regulated investment company would result in corporate level taxation, and consequently, a reduction in income available for distribution to shareholders.

Each Fund invests substantially all of its assets in the Portfolio, which is treated as a partnership for U.S. federal income tax purposes, and the Hedged International Developed Equity Index Fund will use the balance of its assets to enter into foreign currency forward contracts, foreign currency futures and options, and currency swaps or purchase currency structured notes, in order to hedge the non-U.S. currency exposure created by the Portfolio's investment in foreign equities to the U.S. dollar. Because each Fund invests substantially all of its assets in the Portfolio, the nature and character of each Fund's income, gains, losses and deductions generally will be determined at the Portfolio level, and each Fund will be allocated its share of the Portfolio's income, gains, losses and deductions. As applicable, references in this discussion to income, gains and losses of a Fund will include references to income, gains and losses recognized and deductions accruing at the Portfolio level and allocated to or otherwise taken into account by the Fund, and references to assets of a Fund will include references to the Fund's allocable share of the assets of the Portfolio.

For U.S. federal income tax purposes, distributions of investment income generally are taxable to you as ordinary income. Taxes on distributions of capital gains generally are determined by how long the Fund or Portfolio owned (or is deemed to have owned) the investments that generated them, rather than how long you have owned your Fund Shares. Distributions of net capital gains (that is, the excess of net long-term capital gains over net short-term capital losses) from the sale of investments that a Fund or the Portfolio owned (or is deemed to have owned) for more than one year that are properly reported by a Fund as capital gain dividends generally will be treated as long-term capital gain includible in your net capital gain and taxed to individuals at reduced rates. Distributions of gains from investments that a Fund or Portfolio owned (or is deemed to have owned) for one year or less generally will be taxable to you as ordinary income. Distributions of investment income properly reported by a Fund as derived from “qualified dividend income,” which will not include income from the Fund's or the Portfolio's portfolio securities on loan, are taxed to individuals at the rates applicable to net capital gain, provided holding period and other requirements are met by both the shareholder and the Fund or the Portfolio, as applicable. Distributions are taxable to you even if they are paid from income or gains earned by a Fund, including through the Portfolio, before your investment (and thus were included in the price you paid for your shares). Distributions may also be subject to state and local taxes and are taxable whether you receive them in cash or reinvest them in additional shares. Distributions in excess of a Fund's current and accumulated earnings and profits are treated as a return of capital to the extent of your basis in the applicable Fund's shares, and, in general, as capital gain thereafter.

Any gain resulting from the redemption or other taxable disposition of Fund Shares generally will also be taxable to you as either short-term or long-term capital gain, depending upon how long you held such Fund Shares.

An additional 3.8% Medicare contribution tax is imposed on the “net investment income” of individuals, estates and trusts to the extent their income exceeds certain threshold amounts. Net investment income generally includes for this purpose dividends paid by a Fund, including any capital gain dividends, and net gains recognized on the redemption (or other taxable disposition) of Fund Shares.

A Fund's and the Portfolio's income from or proceeds of dispositions of its investments in non-U.S. assets may be subject to non-U.S. withholding or other taxes, which will reduce the yield on those investments. In certain instances, a Fund may be entitled to elect to pass through to its shareholders a credit (or deduction, for a shareholder that itemizes deductions and so chooses) for foreign taxes (if any) borne with respect to foreign securities income earned by the Fund or the Portfolio. If the Fund so elects, shareholders will include in gross income from foreign sources their pro rata shares of such taxes, if any, treated as paid by the Fund. There can be no assurance that a Fund will make such election, even if it is eligible to do so. If a Fund does not qualify for or does not make such election, shareholders will not be entitled separately to claim a credit or deduction with respect to foreign taxes incurred by the Fund; in that case the foreign tax will nonetheless reduce the Fund's taxable income. Shareholders that are not subject to U.S. federal income tax, and those who invest in a Fund through tax-advantaged accounts (including those who invest through IRAs or other tax-advantaged retirement plans), generally will receive no benefit from any tax credit or deduction passed through by the Fund. Under certain circumstances, if a Fund receives a refund of foreign taxes paid in respect of a prior year, the value of Fund Shares could be affected or any foreign tax credits or deductions passed through to shareholders in respect of the Fund's foreign taxes for the current year could be reduced.

Certain of a Fund's or the Portfolio's investment practices, including derivative transactions and investments in debt obligations issued or purchased at a discount, will be subject to special and complex U.S. federal income tax provisions. These special rules may affect the timing, character, and/or amount of the Portfolio's or Fund's income or gains, and, in turn, a Fund's distributions to shareholders, and may require the Fund or the Portfolio to sell its investments at a time when it is not advantageous to do so.

In particular, the Hedged International Developed Equity Index Fund's transactions in respect of foreign currencies will potentially give rise to ordinary income and loss to the extent such income or loss results from fluctuations in the value of the foreign currency concerned. Such activities will potentially increase distributions to shareholders, including at the end of the year, accelerate distributions to shareholders, and increase the distributions taxed to shareholders as ordinary income. Moreover, any net losses arising from such activities will generally reduce and potentially require the recharacterization of prior ordinary income distributions, including in whole or in part as a return of capital. Any net ordinary losses so created cannot be carried forward by the Fund to offset income or gains earned in subsequent taxable years. The Hedged International Developed Equity Index Fund makes an election to treat currency gains and losses derived from certain eligible foreign currency forward contracts as capital gains and losses. It is possible that the Hedged International Developed Equity Index Fund will elect, on a prospective basis, to treat currency gains and losses derived from futures contracts or options as capital gains and losses; not all currency gains and losses derived from foreign currency contracts are eligible for this treatment.

If you are not a U.S. person, dividends paid by a Fund that the Fund properly reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends, each as further defined in the SAI, are not subject to withholding of U.S. federal income tax, provided that certain requirements are met. A Fund is permitted, but is not required, to report any part of its dividends as are eligible for such treatment. A Fund's dividends other than those the Fund so reports as capital gain dividends, short-term capital gain dividends, or interest-related dividends generally will be subject to U.S. withholding tax at a 30% rate (or lower applicable treaty rate). See each Fund's SAI for further information.

The U.S. Treasury and the Internal Revenue Service (the “IRS”) generally require a Fund to obtain information sufficient to identify the status of each shareholder under sections 1471-1474 of the Code, and the U.S. Treasury and IRS guidance issued thereunder (collectively, “FATCA”) or under an applicable intergovernmental agreement between the United States and a foreign government. Please see the SAI for more information on FATCA reporting requirements.

Cost Basis Reporting. U.S. Treasury regulations mandate cost basis reporting to shareholders and the IRS for redemptions of Fund Shares acquired on or after January 1, 2012 (“Post Effective Date Shares”). If you acquire and hold shares directly through the Funds and not through a Financial Intermediary, SS&C GIDS, Inc. will use a default average cost basis methodology for tracking and reporting your cost basis on Post Effective Date Shares, unless you request, in writing, another cost basis reporting methodology.

Financial Intermediary Arrangements

Payments to Financial Intermediaries

In addition to payments under the Plan described above, the Funds may reimburse SSGA FD or its affiliates for payments made to Financial Intermediaries that provide certain administrative, recordkeeping, and account maintenance services. The amount of the reimbursement and the manner in which it is calculated are reviewed by the Trustees periodically.

Financial Intermediaries are firms that sell shares of mutual funds, including the Funds, and/or provide certain administrative and account maintenance services to mutual fund investors. Financial Intermediaries may include, among others, brokers, financial planners or advisers, banks, retirement plan recordkeepers and insurance companies.

In some cases, a Financial Intermediary may hold its clients' Fund Shares in nominee or street name and may utilize omnibus accounts. Shareholder services provided by a Financial Intermediary may (though they will not necessarily) include, among other things: establishing and maintaining shareholder account registrations; receiving and processing purchase and redemption orders, including aggregated orders and delivering orders to the Fund's transfer agent; processing and mailing trade confirmations, periodic statements, prospectuses, annual reports, semiannual reports, shareholder notices, and other SEC-required communications; capturing and processing tax data; issuing and mailing dividend checks to shareholders who have selected cash distributions; preparing record date shareholder lists for proxy solicitations; and collecting and posting distributions to shareholder accounts.

The Financial Intermediary is often compensated by SSGA FD or its affiliates for the services it performs and in such cases is typically paid continually over time, during the period when the Financial Intermediary's clients hold investments in the Funds. The amount of continuing compensation paid by SSGA FD or its affiliates to different Financial Intermedi

aries for distribution and/or shareholder services varies. Any compensation is typically a percentage of the value of the Financial Intermediary's clients' investments in the Funds or a per account fee. The variation in compensation may, but will not necessarily, reflect enhanced or additional services provided by the Financial Intermediary.

If you invest through a Financial Intermediary and meet the eligibility criteria for more than one share class, you should discuss with your Financial Intermediary which share class is appropriate for you. Your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend one share class over another, when you are eligible to invest in more than one share class. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by the Funds or its affiliates with respect to the different share classes offered by the Funds.

SSGA FD and its affiliates (including SSGA FM), at their own expense and out of their own assets, may also provide other compensation to Financial Intermediaries in connection with sales of the Funds' shares or the servicing of shareholders or shareholder accounts. Such compensation may include, but is not limited to, financial assistance to Financial Intermediaries in connection with conferences, sales, or training programs for their employees; seminars for the public; advertising or sales campaigns; or other Financial Intermediary-sponsored special events. In some instances, this compensation may be made available only to certain Financial Intermediaries whose representatives have sold or are expected to sell significant amounts of shares. Dealers may not use sales of the Funds' shares to qualify for this compensation to the extent prohibited by the laws or rules of any state or any self-regulatory agency, such as FINRA.

If payments to Financial Intermediaries by the distributor or adviser for a particular mutual fund complex exceed payments by other mutual fund complexes, your financial adviser and the Financial Intermediary employing him or her may have an incentive to recommend that fund complex over others. Please speak with your financial adviser to learn more about the total amounts paid to your financial adviser and his or her firm by SSGA FD and its affiliates and by sponsors of other mutual funds he or she may recommend to you. You should also consult disclosures made by your Financial Intermediary at the time of purchase.

Third-Party Transactions. The State Street Funds have authorized certain Financial Intermediaries to accept purchase, redemption and exchange orders on the State Street Funds' behalf. Orders received for a State Street Fund by a Financial Intermediary that has been authorized to accept orders on the Fund's behalf (or other Financial Intermediaries designated by the Financial Intermediary) will be deemed accepted by the Fund at the time they are received by the Financial Intermediary and will be priced based on the Fund's next NAV determination as long as the Financial Intermediary transmits the order in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will be the sole party to determine if a trade is received in good order. The Financial Intermediary is responsible for transmitting your orders and associated funds in good form and in a timely manner to the applicable State Street Fund(s). The State Street Funds will not be responsible for delays by the Financial Intermediary in transmitting your orders, including timely transfer of payment, to a Fund.

If you are purchasing, selling, exchanging or holding State Street Fund shares through a program of services offered by a Financial Intermediary, you may be required by the Financial Intermediary to pay additional fees. You should contact the Financial Intermediary for information concerning what additional fees, if any, may be charged.

STATE STREET INSTITUTIONAL INVESTMENT TRUST

STATE STREET HEDGED INTERNATIONAL DEVELOPED EQUITY INDEX FUND

FINANCIAL HIGHLIGHTS

Selected data for a share outstanding throughout each period

	Class K
	Year Ended 12/31/23	Year Ended 12/31/22	Year Ended 12/31/21	Year Ended 12/31/20(a)	Year Ended 12/31/19(a)
Net asset value, beginning of period	$94.80	$121.55	$104.85	$104.30	$87.90
Income (loss) from investment operations:
Net investment income (loss) (b)	3.11	3.25	2.93	2.15	3.10
Net realized and unrealized gain (loss)	15.56	(8.89 )	17.33	0.53	18.60
Total from investment operations	18.67	(5.64 )	20.26	2.68	21.70
Distributions to shareholders from:
Net investment income	(4.12 )	(3.21 )	(3.56 )	(2.13 )	(3.20 )
Net realized gains	—	(17.90 )	—	—	(2.10 )
Total distributions	(4.12 )	(21.11 )	(3.56 )	(2.13 )	(5.30 )
Net asset value, end of period	$109.35	$94.80	$121.55	$104.85	$104.30
Total return (c)	19.73 %	(4.78 )%	19.31 %	2.45 %	24.82 %
Ratios and Supplemental Data:
Net assets, end of period (in 000s)	$3,056,806	$3,490,623	$4,512,062	$3,684,209	$3,772,743
Ratios to Average Net Assets:
Total expenses	0.36 %	0.36 %	0.35 %	0.36 %	0.36 %
Net expenses	0.20 %	0.20 %	0.20 %	0.20 %	0.20 %
Net investment income (loss)	2.95 %	2.85 %	2.50 %	2.23 %	3.08 %
Portfolio turnover rate (d)	8 %	18 %	7 %	8 %	3 %

(a)	On April 17, 2020, the State Street Hedged International Developed Equity Index Fund underwent a 1-for-10 reverse share split. The historical per share activity presented here has been retroactively adjusted to reflect this split.
(b)	Net investment income per share is calculated using the average shares method.
(c)	Total return is calculated assuming a purchase of shares at net asset value on the first day and a sale at net asset value on the last day of each period reported. Distributions are assumed, for the purpose of this calculation, to be reinvested at net asset value per share on the respective payment dates of the Fund. Total return for periods of less than one year are not annualized. Results represent past performance and are not indicative of future results.
(d)	Portfolio turnover rate is from the corresponding affiliated Portfolio.

Index/Trademark Licenses/Disclaimers

The Index Providers are not affiliated with the Trust, the Adviser, the Funds' Administrator, Sub-Administrator, Custodian, Transfer Agent, SSGA FD or any of their respective affiliates. The Adviser (“Licensee”) has entered into license agreements with the Index Providers pursuant to which the Adviser pays a fee to use their respective Indices. The Adviser is sub-licensing rights to the Indices to the Funds at no charge.

THE FUNDS ARE NOT SPONSORED, ENDORSED, SOLD OR PROMOTED BY MSCI INC. (“MSCI”), ANY OF ITS AFFILIATES, ANY OF ITS INFORMATION PROVIDERS OR ANY OTHER THIRD PARTY INVOLVED IN, OR RELATED TO, COMPILING, COMPUTING OR CREATING ANY MSCI INDEX (COLLECTIVELY, THE “MSCI PARTIES”).THE MSCI INDICES ARE THE EXCLUSIVE PROPERTY OF MSCI. MSCI AND THE MSCI INDEX NAMES ARE SERVICE MARK(S) OF MSCI OR ITS AFFILIATES AND HAVE BEEN LICENSED FOR USE FOR CERTAIN PURPOSES BY THE LICENSEE. NONE OF THE MSCI PARTIES MAKES ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY REGARDING THE ADVISABILITY OF INVESTING IN FUNDS GENERALLY OR IN THE MSCI FUNDS PARTICULARLY OR THE ABILITY OF ANY MSCI INDEX TO TRACK CORRESPONDING STOCK MARKET PERFORMANCE. MSCI OR ITS AFFILIATES ARE THE LICENSORS OF CERTAIN TRADEMARKS, SERVICE MARKS AND TRADE NAMES AND OF THE MSCI INDICES WHICH ARE DETERMINED, COMPOSED AND CALCULATED BY MSCI WITHOUT REGARD TO THE MSCI FUNDS OR THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY. NONE OF THE MSCI PARTIES HAS ANY OBLIGATION TO TAKE THE NEEDS OF THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY INTO CONSIDERATION IN DETERMINING, COMPOSING OR CALCULATING THE MSCI INDICES. NONE OF THE MSCI PARTIES IS RESPONSIBLE FOR OR HAS PARTICIPATED IN THE DETERMINATION OF THE TIMING OF, PRICES AT, OR QUANTITIES OF THE MSCI FUNDS TO BE ISSUED OR IN THE DETERMINATION OR CALCULATION OF THE EQUATION BY OR THE CONSIDERATION INTO WHICH THE MSCI FUNDS ARE REDEEMABLE. FURTHER, NONE OF THE MSCI PARTIES HAS ANY OBLIGATION OR LIABILITY TO THE ISSUER OR OWNERS OF THE MSCI FUNDS OR ANY OTHER PERSON OR ENTITY IN CONNECTION WITH THE ADMINISTRATION, MARKETING OR OFFERING OF THE MSCI FUNDS.

ALTHOUGH MSCI SHALL OBTAIN INFORMATION FOR INCLUSION IN OR FOR USE IN THE CALCULATION OF THE MSCI INDICES FROM SOURCES THAT MSCI CONSIDERS RELIABLE, NONE OF THE MSCI PARTIES WARRANTS OR GUARANTEES THE ORIGINALITY, ACCURACY AND/OR THE COMPLETENESS OF ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. NONE OF THE MSCI PARTIES MAKES ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE ISSUER OF THE MSCI FUNDS, OWNERS OF THE FUNDS, OR ANY OTHER PERSON OR ENTITY, FROM THE USE OF ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. NONE OF THE MSCI PARTIES SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS OR INTERRUPTIONS OF OR IN CONNECTION WITH ANY MSCI INDEX OR ANY DATA INCLUDED THEREIN. FURTHER, NONE OF THE MSCI PARTIES MAKES ANY EXPRESS OR IMPLIED WARRANTIES OF ANY KIND, AND THE MSCI PARTIES HEREBY EXPRESSLY DISCLAIM ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO EACH MSCI INDEX AND ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL ANY OF THE MSCI PARTIES 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.

NO PURCHASER, SELLER OR HOLDER OF THE MSCI FUNDS, OR ANY OTHER PERSON OR ENTITY, SHOULD USE OR REFER TO ANY MSCI TRADE NAME, TRADEMARK OR SERVICE MARK TO SPONSOR, ENDORSE, MARKET OR PROMOTE THESE FUNDS WITHOUT FIRST CONTACTING MSCI TO DETERMINE WHETHER MSCI'S PERMISSION IS REQUIRED. UNDER NO CIRCUMSTANCES MAY ANY PERSON OR ENTITY CLAIM ANY AFFILIATION WITH MSCI WITHOUT THE PRIOR WRITTEN PERMISSION OF MSCI.

For more information about the Funds:

The Funds' SAI includes additional information about the Funds and is incorporated by reference into this document. Additional information about the Funds' investments is available in the Funds' most recent annual and semi-annual reports to shareholders. In a 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 Funds' SAI is available, without charge, upon request. The Funds' annual and semi-annual reports is available or will be available, without charge, upon request. Shareholders in the Funds may make inquiries to the Funds to receive such information by calling (800) 997-7327 or the customer service center at the telephone number shown in the accompanying contract prospectus, if applicable. Each Fund's Prospectus and SAI are available, and the annual and semi-annual reports to shareholders are available, or will be available, free of charge, on the Funds' website at www.ssga.com.

Reports and other information about the Funds are available free of charge on the EDGAR Database on the SEC'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: [email protected].

SSGA Funds Management, Inc

ONE IRON STREET

BOSTON, MASSACHUSETTS 02210

SSITSTATPRO2The State Street Institutional Investment Trust's Investment Company Act File Number is 811-09819.

Online:	www.ssga.com	24 hours a day, 7 days a week
Phone:	(800) 647-7327	Monday – Friday 7:00 am – 5:00 pm EST

Fund Summaries	1
State Street Hedged International Developed Equity Index Fund	1
State Street International Developed Equity Index Fund	10
Additional Information About Investment Objectives, Principal Strategies and Risks	17
Additional Information About Non-Principal Investment Strategies and Risks	28
Portfolio Holdings Disclosure	30
Management and Organization	31
Shareholder Information	33
Dividends, Distributions and Tax Considerations	41
Financial Intermediary Arrangements	43
Financial Highlights	45
Index/Trademark Licenses/Disclaimers	47

Regular mail	Overnight/ Registered, Express, Certified Mail
State Street Funds P.O. Box 219737 Kansas City, MO 64121-9737	State Street Funds 430 W 7th Street Suite 219737 Kansas City, MO 64105-1407