ITOT vs VOOV: 54% overlap
iShares Core S&P Total U.S. Stock Market ETF and Vanguard S&P 500 Value ETF share 54.4% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published 27 days apart — VOOV as of 2026-06-30, the rest through 2026-07-27. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 1.5. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
ITOT and VOOV hold 438 of the same securities. The ten contributing most to the overlap figure:
| Holding | in ITOT | in VOOV | Δ |
|---|---|---|---|
| AAPL | 6.9% | 7.3% | 0.5% |
| AMZN | 3.1% | 3.8% | 0.6% |
| TSLA | 1.2% | 1.6% | 0.3% |
| JPM | 1.3% | 0.9% | 0.4% |
| XOM | 0.9% | 2.0% | 1.1% |
| JNJ | 0.9% | 0.9% | 0.0% |
| V | 0.8% | 0.9% | 0.1% |
| WMT | 0.7% | 1.7% | 1.0% |
| ABBV | 0.6% | 0.8% | 0.2% |
| CSCO | 0.6% | 0.8% | 0.1% |
Where ITOT and VOOV differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | ITOT | VOOV | Δ |
|---|---|---|---|
| Information Technology | 34.5% | 20.5% | +14.0pp |
| Communication Services | 8.9% | 2.9% | +6.0pp |
| Consumer Staples | 4.5% | 8.8% | −4.3pp |
| Energy | 3.5% | 6.6% | −3.2pp |
| Health Care | 9.8% | 12.2% | −2.4pp |
| Financials | 12.9% | 15.3% | −2.4pp |
| Utilities | 2.2% | 4.4% | −2.2pp |
| Materials | 2.1% | 3.7% | −1.6pp |
Δ is ITOT minus VOOV, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
44.5% of ITOT by weight, held in no part of VOOV.
0.0% of VOOV by weight, held in no part of ITOT.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| ITOT | VOOV | |
|---|---|---|
| Top 10 holdings | 32.5% | 23.8% |
| Positions held | 2,438 | 438 |
| Cost per $10,000 held, per year | $3 | $7 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do ITOT and VOOV overlap?
ITOT and VOOV overlap 54.4% by portfolio weight — substantial duplication if you hold both. They share 438 holdings. The figure comes from current issuer holdings files (ITOT as of 2026-07-27, VOOV as of 2026-06-30).
How is the overlap between ITOT and VOOV calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If ITOT holds a stock at 6% and VOOV holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both ITOT and VOOV?
That depends on your goals — we state facts, not advice. At 54.4% overlap, each fund still contributes meaningfully distinct exposure.
What does ITOT own that VOOV doesn't?
ITOT holds 2,438 positions and VOOV holds 438; 1,999 of ITOT's positions don't appear in VOOV at all, and they are 44.5% of ITOT by weight.
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Related comparisons
Sources: issuer holdings files, ITOT as of 2026-07-27, VOOV as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.