Equity Index Fund
Data updated: 2026-08-27
C000025733 — Equity Index Fund. United States Large Cap Blend / Core Equity · $5.97B AUM · 0.14% expense ratio. Holdings, fees, performance and SEC filings.
C000025733 Fund Overview
Equity Index Fund is a US mutual fund managed by Mutual Of America Investment CORP, 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: Mutual Of America Investment CORP
- Category: United States Large Cap Blend / Core Equity
- Assets under management: $5.97B
- 1-year return: 22.2%
- SEC CIK: 0000795259
- SEC series ID: S000009389
- Share class ID: C000025733
C000025733 Investment Objective and Strategy
Equity Index Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Mutual Of America Investment CORP.
Investment objective
The Fund seeks investment results (before fees and expenses) that correspond to the investment performance of the S&P 500 Index.
Principal investment strategy
The Fund primarily invests in the 500 common stocks included in the S&P 500 Index to replicate, to the extent practicable and cost effective, the weightings of such stocks in the Index. The components of the Index are market capitalization weighted, adjusted for free float, which is the value of shares readily available in the market as held by public investors. Under normal circumstances, at least 80% of the Funds net assets (plus the amount of any borrowings for investment purposes) are invested in securities included in the S&P 500 Index. The Fund is rebalanced at approximately the same time that the S&P 500 Index to which the Fund is benchmarked is rebalanced and reconstituted, which currently occurs on the third Friday of the last month of each quarter. Because the Fund seeks to approximate the performance of an index, it expects to have investment exposure to industries and sectors represented in the index to the same extent as the representation of those industries and sectors in the index.
Currently, the Fund invests significantly in the stocks of technology companies. The Fund may become non-diversified, as defined under the 1940 Act, as a result of a change in relative market capitalization or index weighting of one or more constituents of the S&P 500 Index to which the Fund is benchmarked. This means that the Fund may invest a greater percentage of its assets in a limited number of issuers than would be the case if the Fund were always managed as a diversified management investment company. The Fund intends to be diversified in approximately the same proportion as the S&P 500 Index. Shareholder approval will not be sought when the Fund crosses from diversified to non-diversified status due to a change in the relative market capitalization or index weighting of one or more constituents of the S&P 500 Index.
C000025733 Holdings
Top 10 holdings of Equity Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| NVIDIA Corp. | 7.44% |
| Apple, Inc. | 6.47% |
| Microsoft Corp. | 4.22% |
| Amazon.com, Inc. | 3.54% |
| Alphabet, Inc. | 3.21% |
| Broadcom, Inc. | 2.76% |
| Alphabet, Inc. | 2.56% |
| Micron Technology, Inc. | 1.97% |
| Meta Platforms, Inc. | 1.87% |
| Tesla, Inc. | 1.80% |
C000025733 Portfolio Allocation
Asset-class allocation of Equity Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 98.7% |
| Fixed Income | 1.2% |
| Cash & Equivalents | 0.1% |
C000025733 Performance
Total returns for C000025733 (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 10.1% |
| 1 year | 22.2% |
| 3 years (annualised) | 20.4% |
| 5 years (annualised) | 13.2% |
C000025733 Risk Information
Risk metrics for C000025733, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 13.1%
C000025733 Costs and Fees
C000025733 costs about $14 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.14%
- Gross expense ratio: 0.14%
- Portfolio turnover: 3%
- Brokerage commissions: 0.10 bps of average net assets (SEC N-CEN)
C000025733 Cashflows
Over the 12 months to 2026-06, Equity Index Fund had net outflows of $476.31M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$73.03M |
| 2026-05 | −$605.43M |
| 2026-04 | −$28.52M |
| 2026-03 | −$30.37M |
| 2026-02 | −$21.24M |
| 2026-01 | −$17.95M |
C000025733 Debt Constituents
Largest debt holdings of Equity Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Of America - Bureau Of The Public Debt | 0.58% |
| United States Of America - Bureau Of The Public Debt | 0.25% |
| United States Of America - Bureau Of The Public Debt | 0.17% |
| United States Of America - Bureau Of The Public Debt | 0.13% |
| United States Of America - Bureau Of The Public Debt | 0.11% |
C000025733 Prospectus and SEC Filings
Official Equity Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-04-28
- Prospectus (485BPOS) — filed 2025-04-29
- Prospectus supplement (497) — filed 2026-01-07
- Portfolio holdings (N-PORT) — filed 2026-08-27
- Portfolio holdings (N-PORT) — filed 2026-05-21
- Portfolio holdings (N-PORT) — filed 2026-02-23
- Annual census (N-CEN) — filed 2026-03-12
- Annual census (N-CEN) — filed 2025-02-28
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.