VIIIX — Vanguard Institutional Index Fund
Data updated: 2026-05-28
VIIIX — Vanguard Institutional Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. United States Large Cap Blend / Core Equity · $315.46B AUM · 0.02% expense ratio · 17.8% 1-yr return. From SEC regulatory filings.
VIIIX Fund Overview
VIIIX — Vanguard Institutional Index Fund 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: $315.46B
- 1-year return: 17.8%
- Ticker: VIIIX
- SEC CIK: 0000862084
- SEC series ID: S000002853
- Share class ID: C000007826
VIIIX 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 | 7.57% |
| Apple Inc | 6.66% |
| Microsoft Corp | 4.91% |
| Amazon.com Inc | 3.64% |
| Alphabet Inc | 2.99% |
| Broadcom Inc | 2.62% |
| Alphabet Inc | 2.40% |
| Meta Platforms Inc | 2.24% |
| Tesla Inc | 1.87% |
| Berkshire Hathaway Inc | 1.57% |
VIIIX 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% |
VIIIX Performance
Total returns for VIIIX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -4.3% |
| 1 year | 17.8% |
| 3 years (annualised) | 18.3% |
| 5 years (annualised) | 12.0% |
VIIIX Risk Information
Risk metrics for VIIIX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 10.3%
VIIIX Costs and Fees
VIIIX costs about $2 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.02%
- Gross expense ratio: 0.02%
- Portfolio turnover: 4%
- Brokerage commissions: 0.05 bps of average net assets (SEC N-CEN)
VIIIX Cashflows
Over the 12 months to 2026-03, Vanguard Institutional Index Fund had net outflows of $21.08B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $1.71B |
| 2026-02 | −$2.25B |
| 2026-01 | −$2.22B |
| 2025-12 | $1.33B |
| 2025-11 | −$1.54B |
| 2025-10 | −$1.78B |
VIIIX Debt Constituents
No individual debt constituents are reported in Vanguard Institutional Index Fund's latest SEC N-PORT filing.
VIIIX Prospectus and SEC Filings
Official Vanguard Institutional Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
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.