SPINX
SIIT S&P 500 INDEX FUND
SEI INSTITUTIONAL INVESTMENTS TRUST
Index fund
Expense ratio1
0.12%
Net assets2
$4.37B
Holdings2
505
Category
US Equity
2025 return3
15.54%

Investment objective & strategy

As of Nov. 18, 2025 · prospectus

Strategy. In the Fund Summary of the Large Cap Index Fund, S & P 500 Index Fund and Extended Market Index Fund, under the sub-heading "Principal Investment Strategies," the following text is hereby added at the end of the first paragraph: The Fund may become "non-diversified," as defined in the Investment Company Act of 1940 Act, as amended (the "1940 Act"), as a result of a change in relative market capitalization or index weighting of one or more constituents of the Index. In the Fund Summary of the Large Cap Index Fund, S & P 500 Index Fund and Extended Market Index Fund, under the sub-heading "Principal Investment Strategies," the following text is hereby added at the end of the first paragraph: The Fund may become "non-diversified," as defined in the Investment Company Act of 1940 Act, as amended (the "1940 Act"), as a result of a change in relative market capitalization or index weighting of one or more constituents of the Index.

Top holdings

As of Feb. 28, 2026 · N-PORT
SecurityTickerValue% of fund
NVIDIA CORP $313.55M 7.17%
APPLE INC COMMON STOCK $284.27M 6.50%
MICROSOFT CORP $212.56M 4.86%
PUT Amazon.com, Inc. 01/02/2026 P205 $148.77M 3.40%
ALPHABET INC CL A $132.09M 3.02%
BROADCOM INC $109.88M 2.51%
ALPHABET INC CL C $105.45M 2.41%
META PLATFORMS INC CL A $102.80M 2.35%
TESLA INC $82.36M 1.88%
US ULTRA BOND CBT Sep25 $81.63M 1.87%
View all holdings →

Allocation by sector

As of February 28, 2026 · N-PORT
View portfolio breakdown →

Portfolio moves

Nov 30, 2025 → Feb 28, 2026
Opened
6
Exited
6
Increased
6
Decreased
476
Unchanged
17

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.

View portfolio moves →

Similar funds

Funds whose portfolios most overlap this one, by weight
FundOverlapNet exp.
SIMT S&P 500 Index Fund · SSPIX, TRQIX, SPIIX, SETYX 97% 0.54%
Global X U.S. 500 ETF · GXLC 94% 0.02%
Global X Adaptive U.S. Risk Management ETF · ONOF 94% 0.39%
View all similar funds →

Advisers

As of May 31, 2025 · N-CEN
FirmRole
SEI INVESTMENTS MANAGEMENT Corporation Adviser
SSGA Funds Management, Inc. Sub-adviser

Footnotes

  1. Expense ratio as of September 26, 2025, from the fund's prospectus.
  2. Net assets and holdings count as of February 28, 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).

Machine-readable: JSON · Markdown. Programmatic access via the agent surface.