iShares S&P 500 Index Fund
U.S. stock index fund · tracks Standard & Poor's 500 Index
As of its 2026 Q2 report, iShares S&P 500 Index Fund held 1 positions with $59.06B in net assets. Its ten largest holdings made up 100.4% of the fund. The WFSPX share class costs 0.03% a year. Over the 12 months to May 2026, WFSPX returned 29.7%, with dividends reinvested.
The investment objective of the iShares S&P 500 Index Fund (the Fund ), a series of BlackRock Funds III (the Trust), is to seek to provide investment results that correspond to the total return performance of publicly-traded common stocks in the aggregate, as represented by the Standard & Poors 500 Index (the S&P 500 Index or the Underlying Index ).
The fund seeks to replicate the total return of the S&P 500 Index by holding securities in the same capitalization-weighted proportions as the index, with at least 90% of assets invested in S&P 500 constituents. The fund operates through a master/feeder structure, investing all assets in a master portfolio that holds the underlying securities. Because the fund aims to match an index composed of approximately 500 stocks weighted by float-adjusted market value, its returns will track the index's performance.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
MASTER INVESTMENT PORTFOLIO | 100.41% | $59.30B | 82.2M | $721.48 |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
All 1 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Stocks | 100.41% |
How it has done
WFSPX share class · total returns with dividends reinvested
Volatility over the last 12 months: 13.14%. Past returns are a record, not a forecast.
Jun 2026 has been filed since the trailing figures were struck, so it is not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
This fund changed legal form during the period shown. The history above is continuous — it spans both eras, and the change is not a gap in reporting.
Fees & fund details
iShares S&P 500 Index Fund is a U.S. equity index fund that tracks the Standard & Poor's 500 Index.
- Asset class
- Equity
- Region
- United States
- Management
- Index (passive)
- Fund type
- Open-end fund
- Features
- Master-feeder
- Expense ratio, by class
- 0.01% – 0.35%· WFSPX 0.03%
- Portfolio turnover
- 14.00% a year · as of 2026 Q2
Turnover is how much of the portfolio was replaced in a year.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
New and exited totals aren’t verifiable for this fund.
Understand how this fund fits with the rest.
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