SSMHX
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
STATE STREET INSTITUTIONAL INVESTMENT TRUST
Index fund
Expense ratio1
0.02%
Net assets2
$2.63B
Holdings2
2444
Category
US Equity
2025 return3
12.83%

Investment objective & strategy

As of April 25, 2025 · prospectus

Objective. The State Street Small/Mid Cap Equity Index Portfolio (the Small/Mid Cap Equity Index Portfolio ? or the Portfolio) seeks to provide investment results that, before expenses, correspond generally to the total return of an index that tracks the performance of mid-to small- capitalization exchange traded U.S. equity securities.

Strategy. The Portfolio uses a passive management strategy designed to track the performance of the Russell Small Cap Completeness Index (the Index). The Index is a float-adjusted, market capitalization index which measures the performance of the Russell 3000 Index companies excluding S&P 500 constituents. The Index is constructed to provide a comprehensive and unbiased barometer of the extended broad market beyond the S&P 500 exposure. The Index is completely reconstituted annually to ensure new and growing equities are included. As of February 28, 2025, the market capitaliza tion of the companies included in the Index ranged from $ 1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion … The Portfolio uses a passive management strategy designed to track the performance of the Russell Small Cap Completeness Index (the Index). The Index is a float-adjusted, market capitalization index which measures the performance of the Russell 3000 Index companies excluding S&P 500 constituents. The Index is constructed to provide a comprehensive and unbiased barometer of the extended broad market beyond the S&P 500 exposure. The Index is completely reconstituted annually to ensure new and growing equities are included. As of February 28, 2025, the market capitaliza tion of the companies included in the Index ranged from $ 1.21 million to $122.09 billion. As of February 28, 2025, the Index comprised 2,457 securities. As of February 28, 2025, a significant portion of the Index comprised companies in the information technology, healthcare, industrials, financials and consumer discretionary sectors, although this may change from time to time. The Portfolio is not managed according to traditional methods of active ? investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Portfolio, using a passive ? or indexing ? investment approach, seeks to provide investment results that, before expenses, correspond generally to the total return of the Index. The Portfolio generally intends to invest in all stocks comprising the Index in approximate proportion to their weightings in the Index. However, under various circumstances, it may not be possible or practicable to purchase all stocks in those weightings. In those circumstances, the Portfolio may purchase a sample of the stocks in the Index in proportions expected by SSGA Funds Management, Inc. ( SSGA FM ? or the Adviser), the investment adviser to the Portfolio, to match generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Portfolio may sell securities that are represented in the Index, or purchase securities that are not yet represented in the Index, in anticipation of their removal from or addition to the Index. Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings, if any) in stocks in the Index. The Portfolio will provide shareholders with at least sixty (60) days' notice prior to any change in this 80% investment policy. The notional value of the Portfolio's investments in derivatives or other synthetic instruments that provide exposures comparable, in the judgment of the Adviser, to investments in the Index may be counted toward satisfaction of this 80% policy. In addition, the Portfolio may invest in equity securities that are not included in the Index, 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 Portfolio may purchase or sell futures contracts on the Index, or options on those futures, in lieu of investing directly in the stocks making up the Index. The Portfolio might do so, for example, in order to increase its investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Portfolio might use futures or options on futures to reduce its investment exposure in situations where it intends to sell a portion of the stocks in its portfolio but the sale has not yet been completed. The Portfolio may also enter into other derivatives transactions, including the use of options or swap transactions relating to the Index or any securities comprising the Index, in lieu of investing directly in the stocks making up the Index. The Portfolio may, to the extent permitted by applicable law, invest in shares of other mutual funds whose investment objectives and policies are similar to those of the Portfolio (including funds advised by the Adviser). The Index is sponsored by FTSE Russell (the Index Provider), which is not affiliated with the Portfolio 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.

Top holdings

As of March 31, 2026 · N-PORT
SecurityTickerValue% of fund
State Street Navigator Securities Lending Portfolio II GVMXX $155.80M 5.94%
MARVELL TECHNOLOGY INC $29.82M 1.14%
SPOTIFY TECHNOLOGY SA $26.53M 1.01%
CLOUDFLARE INC-A $23.01M 0.88%
CHENIERE ENERGY INC $21.51M 0.82%
State Street Navigator Securities Lending Portfolio II GVMXX $18.33M 0.70%
SNOWFLAKE INC CL A $17.78M 0.68%
ANGLOGOLD ASHANTI PLC $17.43M 0.66%
NU HOLDINGS LTD/CAYMAN ISLANDS $17.10M 0.65%
FERGUSON ENTERPRISES INC $15.85M 0.60%
View all holdings →

Allocation by sector

As of March 31, 2026 · N-PORT
View portfolio breakdown →

Portfolio moves

Dec 31, 2025 → Mar 31, 2026
Opened
33
Exited
57
Increased
1771
Decreased
20
Unchanged
627

How many positions this fund opened, exited, grew, trimmed, or left unchanged between its two most recent N-PORT snapshots — net changes between point-in-time reports, not a trade log.

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Similar funds

Funds whose portfolios most overlap this one, by weight
FundOverlapNet exp.
Fidelity Extended Market Index Fund · FSMAX 84% 0.03%
VANGUARD EXTENDED MARKET INDEX FUND · VEXMX, VEXAX, VIEIX, VXF, VEMPX, VSEMX 83% 0.02%
T. Rowe Price Extended Equity Market Index Fund · PEXMX 81% 0.24%
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Advisers

As of December 31, 2025 · N-CEN
FirmRole
SSGA Funds Management, Inc. Adviser

Footnotes

  1. Expense ratio as of April 25, 2025, from the fund's prospectus.
  2. Net assets and holdings count as of March 31, 2026, from the fund's N-PORT filing.
  3. Total return for calendar year 2025, before tax and after fund expenses. Computed by compounding the twelve monthly total returns the fund reported in its SEC N-PORT filings for 2025 (the latest prospectus does not yet chart this year).

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