iShares S&P 500 Index Fund
BlackRock Funds III · Series S000004272 · 1 share classes
data updated 2026-08-17
Fund profile
As filed in the prospectus · 2026 Q2
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.
| Share class | Expense ratio |
|---|---|
| WFSPX | 0.03% |
| C000117725 | 0.35% |
| C000117726 | 0.10% |
| C000117728 | 0.22% |
| C000201951 | 0.35% |
| C000212062 | 0.01% |
Portfolio turnover 14.00% · as of 2026 Q2
Allocation
Asset groups · long / short shown separately, never netted · 2026 Q1
| Stocks | 100.03% |
Latest quarter
What changed since the fund's previous filing
New and exited totals aren’t verifiable for this fund.
Return profile
Total return as filed — price change plus distributions reinvested · trailing figures to Feb 2026
Mar 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.
Holdings
By % of NAV · equity positions carry filed share counts · every resolvable issuer links to its company page
| Ticker | Issuer | %NAV | Reported price | Value | Shares |
|---|---|---|---|---|---|
| — | MASTER INVESTMENT PORTFOLIO | 100.03% | $609.94 | $51.32B | 84.1M |
Reported price is the fund's own reported value divided by its own reported shares at 2026-03-31 — not a live quote, and not what the fund paid.
Top 10 positions are 100.03% of net assets, top 25 100.03%, across 1 issuers.
See more of this fund's book
More positions with filed share counts, and the quarter-over-quarter change list rather than the largest few — free with an account, no card required.
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