VINIX — Vanguard Institutional Index Fund, Institutional Shares
Data updated: 2026-08-28
VINIX — Vanguard Institutional Index Fund, Institutional Shares. 0.04% expense ratio · no sales load. Holdings, fees, performance and SEC filings.
VINIX Fund Overview
VINIX — Vanguard Institutional Index Fund, Institutional Shares is a US mutual fund managed by Vanguard Institutional Index Funds, 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: Vanguard Institutional Index Funds
- Category: United States Large Cap Blend / Core Equity
- Assets under management: $350.31B
- 1-year return: 22.3%
- Ticker: VINIX
- SEC CIK: 0000862084
- SEC series ID: S000002853
- Share class ID: C000007825
VINIX Investment Objective and Strategy
Vanguard Institutional Index Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Vanguard Institutional Index Funds.
Investment objective
Vanguard Institutional Index Fund (the Fund) seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks.
Principal investment strategy
The Fund employs an indexing investment approach designed to track the performance of the S&P 500 Index (the Target Index), a widely recognized benchmark of U.S. stock market performance that is dominated by the stocks of large U.S. companies. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in the stocks that make up the Target Index. The Fund attempts to replicate the Target Index by investing all, or substantially all, of its assets in the stocks that make up the Target Index, holding each stock in approximately the same proportion as its weighting in the Target Index. The Fund may become nondiversified, as defined under the Investment Company Act of 1940, solely as a result of tracking an index. This could occur due to events such as index rebalance or market movement.
A nondiversified fund may invest a greater percentage of its assets in the securities of particular issuers as compared with diversified funds. In addition, the Fund could become concentrated in an industry or group of industries if the Target Index becomes concentrated due to market conditions or the performance of a single or related group of issuers.
VINIX Holdings
Top 10 holdings of Vanguard Institutional Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| NVIDIA Corp | 7.51% |
| Apple Inc | 6.59% |
| Microsoft Corp | 4.29% |
| Amazon.com Inc | 3.62% |
| Alphabet Inc | 3.25% |
| Broadcom Inc | 2.77% |
| Alphabet Inc | 2.59% |
| Micron Technology Inc | 2.02% |
| Meta Platforms Inc | 1.92% |
| Tesla Inc | 1.83% |
VINIX Portfolio Allocation
Asset-class allocation of Vanguard Institutional Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Equity | 99.7% |
| Cash & Equivalents | 0.2% |
VINIX Performance
Total returns for VINIX (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 10.19% |
| 1 year | 22.28% |
| 3 years (annualised) | 20.57% |
| 5 years (annualised) | 13.36% |
VINIX Risk Information
Risk metrics for VINIX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 13.09%
VINIX Costs and Fees
VINIX costs about $4 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.04%
- Gross expense ratio: 0.04%
- Portfolio turnover: 4%
- Brokerage commissions: 0.05 bps of average net assets (SEC N-CEN)
VINIX Cashflows
Over the 12 months to 2026-06, Vanguard Institutional Index Fund had net outflows of $30.10B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$2.55B |
| 2026-05 | −$2.69B |
| 2026-04 | −$6.33B |
| 2026-03 | $1.71B |
| 2026-02 | −$2.25B |
| 2026-01 | −$2.22B |
VINIX Debt Constituents
No individual debt constituents are reported in Vanguard Institutional Index Fund's latest SEC N-PORT filing.
VINIX Prospectus and SEC Filings
Official Vanguard Institutional 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 (485BPOS) — filed 2024-04-26
- Portfolio holdings (N-PORT) — filed 2026-08-28
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-26
- Annual census (N-CEN) — filed 2026-03-12
- Annual census (N-CEN) — filed 2025-03-13
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.