iShares S&P 500 Index Fund
Data updated: 2026-08-25
C000117725 — iShares S&P 500 Index Fund. United States Large Cap Blend / Core Equity · $59.06B AUM. Holdings, fees, performance and SEC filings.
C000117725 Fund Overview
iShares S&P 500 Index Fund is a US mutual fund managed by BlackRock Funds III, categorised as United States Large Cap Blend / Core Equity. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: BlackRock Funds III
- Category: United States Large Cap Blend / Core Equity
- Assets under management: $59.06B
- 1-year return: 21.8%
- SEC CIK: 0000893818
- SEC series ID: S000004272
- Share class ID: C000117725
C000117725 Investment Objective and Strategy
iShares S&P 500 Index Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by BlackRock Funds III.
Investment objective
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 ).
Principal investment strategy
The Fund pursues its investment objective by seeking to replicate the total return performance of the S&P 500 Index, which is composed of approximately 500 selected common stocks, most of which are listed on the New York Stock Exchange (the NYSE). The S&P 500 Index is a capitalization-weighted index from a broad range of industries chosen for market size, liquidity and industry group representation. The component stocks are weighted according to the total float-adjusted market value of their outstanding shares (i.e., they are weighted according to the public float which is the total market value of their outstanding shares readily available to the general marketplace for trading purposes). The percentage of the Funds assets invested in a given stock is approximately the same as the percentage such stock represents in the S&P 500 Index.
The Fund is managed by determining which securities are to be purchased or sold to reflect, to the extent feasible, the investment characteristics of its benchmark index. Under normal circumstances, at least 90% of the value of the Funds assets, plus the amount of any borrowing for investment purposes, is invested in securities comprising the S&P 500 Index. The Fund is a feeder fund that invests all of its assets in the Master Portfolio of MIP, which has the same investment objective and strategies as the Fund. All investments are made at the Master Portfolio level. This structure is sometimes called a master/feeder structure. The Funds investment results will correspond directly to the investment results of the Master Portfolio. For simplicity, the prospectus uses the name of the Fund or the term Fund (as applicable) to include the Master Portfolio.
The Fund intends to be diversified in approximately the same proportion as the Underlying Index is diversified. The Fund may become non-diversified, as defined in the Investment Company Act of 1940, as amended, solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Underlying Index. Shareholder approval will not be sought if the Fund becomes non-diversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the Underlying Index.
C000117725 Holdings
Top 1 holdings of iShares S&P 500 Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Master Investment Portfolio | 100.41% |
C000117725 Portfolio Allocation
Asset-class allocation of iShares S&P 500 Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 100.4% |
C000117725 Performance
Total returns for C000117725 (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 10.0% |
| 1 year | 21.8% |
| 3 years (annualised) | 20.2% |
| 5 years (annualised) | 13.0% |
C000117725 Risk Information
Risk metrics for C000117725, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 13.1%
C000117725 Costs and Fees
C000117725 costs about $35 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.35%
- Gross expense ratio: 0.35%
- Portfolio turnover: 14%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
C000117725 Cashflows
Over the 12 months to 2026-06, iShares S&P 500 Index Fund had net outflows of $170.21M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$80.82M |
| 2026-05 | −$268.68M |
| 2026-04 | $493.88M |
| 2026-03 | $400.05M |
| 2026-02 | $111.36M |
| 2026-01 | −$342.57M |
C000117725 Debt Constituents
No individual debt constituents are reported in iShares S&P 500 Index Fund's latest SEC N-PORT filing.
C000117725 Prospectus and SEC Filings
Official iShares S&P 500 Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-04-24
- Prospectus (485BPOS) — filed 2025-04-25
- Prospectus supplement (497) — filed 2026-02-23
- Portfolio holdings (N-PORT) — filed 2026-08-25
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-24
- Annual census (N-CEN) — filed 2026-03-16
- Annual census (N-CEN) — filed 2025-03-17
Related Funds
Other United States Large Cap Blend / Core Equity funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.