VANGUARD INSTITUTIONAL INDEX FUND
U.S. stock index fund · tracks S&P 500 Index
Vanguard Institutional Index Fund (the Fund) seeks to track the performance of a benchmark index that measures the investment return of large-capitalization stocks.
The fund tracks the S&P 500 Index by holding all or substantially all of its constituent stocks in the same proportions as the index. Because the fund replicates the index rather than sampling it, its returns should closely match the index's performance. The fund may become concentrated in particular issuers or industries if the index itself does, particularly following index rebalances or shifts in market valuations.
What you own
| Company | Weight | Value | Shares | Reported price |
|---|---|---|---|---|
NVDANVIDIA Corp | 7.51% | $26.31B | 131.5M | $200.09 |
AAPLApple Inc | 6.59% | $23.07B | 79.7M | $289.36 |
MSFTMicrosoft Corp | 4.29% | $15.04B | 40.3M | $373.02 |
AMZNAmazon.com Inc | 3.62% | $12.67B | 53.1M | $238.34 |
GOOGLAlphabet Inc | 3.25% | $11.38B | 31.8M | $357.37 |
AVGOBroadcom Inc | 2.77% | $9.71B | 25.7M | $377.75 |
GOOGAlphabet Inc | 2.59% | $9.07B | 25.7M | $353.33 |
2.02% | $7.07B | 6.1M | $1,154.29 | |
1.92% | $6.72B | 11.9M | $563.29 | |
TSLATesla Inc | 1.83% | $6.43B | 15.3M | $420.60 |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
The 200 largest of 516 holdings, with the share counts as filed, open with a free account.
What the fund is made of
Percentages are of fund net assets. Rounding, liabilities and short positions can make totals differ from 100%.
| Stocks | 99.67% |
| Cash & short-term | 0.23% |
| Derivatives | -0.00% |
The outer band is exposure held short — written against the portfolio rather than part of it, which is why it sits outside the ring and why the two are never netted into one figure.
Derivatives are shown at market value, not notional exposure.
By sector
- Information Technology
- 38.0%
- Financials
- 11.5%
- Communication Services
- 9.7%
- Consumer Discretionary
- 9.3%
- 9 other sectors
- 31.4%
- Information Technology
- 38.0%
- Financials
- 11.5%
- Communication Services
- 9.7%
- Consumer Discretionary
- 9.3%
- Industrials
- 8.9%
- Health Care
- 8.9%
- Consumer Staples
- 4.6%
- Energy
- 3.0%
- Utilities
- 2.2%
- Real Estate
- 1.8%
- Materials
- 1.8%
- Cash
- 0.2%
- International
- 0.0%
How it has done
VINIX share class · total returns with dividends reinvested
Volatility over the last 12 months: 13.42%. Past returns are a record, not a forecast.
May 2026 and Jun 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
The 2 share classes hold the same portfolio
| Share class | Expense ratio | 1 year | 3 years | 5 years | Worst fall |
|---|---|---|---|---|---|
| 0.03% | +31.01% | +80.01% | +85.06% | -8.26% | |
| 0.02% | +31.03% | +80.08% | +85.18% | -8.26% |
These classes hold the same portfolio, so the 0.13pp spread over 5 years is the cost difference between them — roughly 0.03pp a year — not a difference in what they own.
Fees & fund details
VANGUARD INSTITUTIONAL INDEX FUND is a U.S. equity index fund that tracks the S&P 500 Index. 21% of VINIX’s stock holdings are in companies whose revenue grew in the top quartile of U.S. companies over the last five fiscal years (covering 100% of the fund’s equity).
- Asset class
- Equity
- Region
- United States
- Management
- Index (passive)
- Fund type
- Open-end fund
- Expense ratio, by class
- 0.02% – 0.03%· VINIX 0.03%
- Portfolio turnover
- 4.00% a year · as of 2026 Q2
Turnover is how much of the portfolio was replaced in a year.
Classified from what the fund holds, not from its name · 2026 Q2. The summary is a paraphrase of the prospectus; the objective is verbatim.
What changed this quarter
Positions that entered or left the fund since its previous filing. Positions that were only resized are not listed.
11 new· the largest 8
11 exited· the largest 8
Understand how this fund fits with the rest.
Explore shared holdings, compare funds and follow their businesses with your connected AI:
- “Where do my funds overlap — VINIX, QQQ and the fund in my 401(k)?”
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