Sensible Investor

Immutable verification record

VANGUARD INSTITUTIONAL INDEX FUND

Run 363649da-fcfb-4007-87ef-de06de7710ca · portfolio period 2026-03-31 · captured 2026-07-29T14:22:09.616Z

This is the permanent record of what our July 29, 2026 data run computed for Vanguard Institutional Index Fund, and the exact SEC documents every number came from — it exists so anyone can check us.

Current interpretation · methodology 1.5

How to read this prior-run record now

This fund holds essentially the same portfolio as Vanguard 500 Index Fund but charges $20 a year per $100,000 instead of $10 — about $504 more over 20 years.

This interpretation is computed under the current methodology and is not inserted into the immutable record below.

Cite these figures

Each snippet includes the figure’s source-event date and immutable verification URL.

Best-fit active share

Sensible Investor, “VANGUARD INSTITUTIONAL INDEX FUND — best-fit active share,” 0.2% versus the S&P 500, fund portfolio as of 2026-03-31; measured against the filed holdings of iShares Core S&P 500 ETF (IVV), as of 2026-03-31. https://sensible-investor.com/registry/viiix/as-of/363649da-fcfb-4007-87ef-de06de7710ca

VIIIX filed expense ratio

Sensible Investor, “VANGUARD INSTITUTIONAL INDEX FUND — filed expense ratio,” 0.02% for VIIIX, as of 2025-12-31. https://sensible-investor.com/registry/viiix/as-of/363649da-fcfb-4007-87ef-de06de7710ca

Active share by comparison index

Holdings difference for every comparison calculated in this run.
IndexActive shareHoldings evidenceIdentifier match
the S&P 5000.2%measured against the filed holdings of iShares Core S&P 500 ETF (IVV), as of 2026-03-31100.0%
the Russell 1000 index7.5%measured against the filed holdings of iShares Russell 1000 ETF (IWB), as of 2026-03-3199.6%
the total US market11.6%measured against the filed holdings of Vanguard Total Stock Market ETF (VTI), as of 2026-03-3199.9%
the Russell 1000 Growth index42.2%measured against the filed holdings of iShares Russell 1000 Growth ETF (IWF), as of 2026-03-3165.6%
the Russell 1000 Value index45.5%measured against the filed holdings of iShares Russell 1000 Value ETF (IWD), as of 2026-03-3162.0%
the Russell 2000 index100.0%measured against the filed holdings of iShares Russell 2000 ETF (IWM), as of 2026-03-310.0%
the S&P SmallCap 600100.0%measured against the filed holdings of iShares Core S&P Small-Cap ETF (IJR), as of 2026-03-310.0%
the S&P MidCap 400100.0%measured against the filed holdings of iShares Core S&P Mid-Cap ETF (IJH), as of 2026-03-310.0%

Filed expense ratios by share class

Each fee is tied to its filed SEC source and period.
Share classExpense ratioFiling periodSEC document
VIIIX (Vanguard Institutional Index Fund)0.02%2025-12-31Open SEC expense filing
VINIX (Vanguard Institutional Index Fund)0.03%2025-12-31Open SEC expense filing

Match rates

How much of the fund filing could be matched to comparison holdings. A benchmark proxy is not compared with itself.
Fund identifier match100.0%
the S&P 500100.0%
the Russell 1000 index99.6%
the total US market99.9%
the Russell 1000 Growth index65.6%
the Russell 1000 Value index62.0%
the Russell 2000 index0.0%
the S&P SmallCap 6000.0%
the S&P MidCap 4000.0%

Fee-drag windows

Dollar fee drag from licensed return windows; the lowest-cost control class is omitted rather than compared with itself, and missing history remains explicit.
Share classWindowFee dragWindow dates
VIIIX10 years$3482016-07-29 to 2026-07-29
VIIIX20 years$1,4962006-07-31 to 2026-07-29
VIIIX30 yearsproxy history begins 2000 — no full 30-year windowProxy history begins 2000-05-19
VINIX10 years$6962016-07-29 to 2026-07-29
VINIX20 years$2,9902006-07-31 to 2026-07-29
VINIX30 yearsproxy history begins 2000 — no full 30-year windowProxy history begins 2000-05-19

Check it yourself

  1. Open the fund’s linked SEC holdings filing and, for fees, the linked SEC expense filing in the table above.
  2. Find each security identifier and portfolio weight in the holdings filing, and the net annual operating expense for the relevant share class in its expense filing.
  3. Recalculate the comparison using the active-share formula and portfolio rules.
Raw record (JSON)

Download this record as JSON

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