VANGUARD INSTITUTIONAL INDEX FUND
VANGUARD INSTITUTIONAL INDEX FUNDS · Series S000002853 · 2 share classes
data updated 2026-09-08
Fund profile
As filed in the prospectus · 2026 Q2
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.
| Share class | Expense ratio |
|---|---|
| VINIX | 0.03% |
| VIIIX | 0.02% |
Portfolio turnover 4.00% · as of 2026 Q2
Allocation
Asset groups · long / short shown separately, never netted · 2026 Q2
| 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.
Latest quarter
What changed since the fund's previous filing
Return profile
Total return as filed — price change plus distributions reinvested · trailing figures to Apr 2026
| Share class | 1-year | 3-year | 5-year | Vol | Worst fall |
|---|---|---|---|---|---|
| +31.01% | +80.01% | +85.06% | 13.42% | -8.26% | |
| +31.03% | +80.08% | +85.18% | 13.42% | -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.
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.
Holdings
By % of NAV · equity positions carry filed share counts · every resolvable issuer links to its company page
| Ticker | Issuer | %NAV | Reported price | Value | Shares |
|---|---|---|---|---|---|
| NVDA | NVIDIA CorpNVDA | 7.51% | $200.09 | $26.31B | 131.5M |
| AAPL | Apple IncAAPL | 6.59% | $289.36 | $23.07B | 79.7M |
| MSFT | Microsoft CorpMSFT | 4.29% | $373.02 | $15.04B | 40.3M |
| AMZN | Amazon.com IncAMZN | 3.62% | $238.34 | $12.67B | 53.1M |
| GOOGL | Alphabet IncGOOGL | 3.25% | $357.37 | $11.38B | 31.8M |
| AVGO | Broadcom IncAVGO | 2.77% | $377.75 | $9.71B | 25.7M |
| GOOG | Alphabet IncGOOG | 2.59% | $353.33 | $9.07B | 25.7M |
| MU | Micron Technology IncMU | 2.02% | $1,154.29 | $7.07B | 6.1M |
| META | Meta Platforms IncMETA | 1.92% | $563.29 | $6.72B | 11.9M |
| TSLA | Tesla IncTSLA | 1.83% | $420.60 | $6.43B | 15.3M |
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.
Top 10 positions are 36.38% of net assets, top 25 51.00%, across 503 issuers.
See more of this fund's book
More positions with filed share counts, and the quarter-over-quarter change list rather than the largest few — free with an account, no card required.
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