iShares Core S&P 500 ETF vs Vanguard S&P 500 ETF — shared top holdings, sector duplication, and what makes each fund different.
Data as of June 12, 2026
How much of the two funds' sector allocations coincide — computed on full sector data, so this is the headline number.
Weight the funds' disclosed top holdings have in common. Public data discloses only each fund's largest positions (39.2% of IVV, 38.4% of VOO), so full-portfolio overlap is at least this much.
9 positions appear in both funds' disclosed top-holdings lists.
96.6% sector overlap is very high. These funds are close substitutes — owning both mostly duplicates one exposure instead of diversifying it. That isn't automatically wrong (fees, share classes or account types can justify holding both), but don't count them as two different bets.
| Ticker | Company | Weight in IVV | Weight in VOO | Overlap |
|---|---|---|---|---|
| NVDA | NVIDIA Corp | 7.9% | 7.8% | 7.8% |
| AAPL | Apple Inc | 7% | 6.4% | 6.4% |
| MSFT | Microsoft Corp | 5.1% | 4.9% | 4.9% |
| AMZN | Amazon.com Inc | 4.1% | 4.2% | 4.1% |
| GOOGL | Alphabet Inc Class A | 3.4% | 3.6% | 3.4% |
| AVGO | Broadcom Inc | 3.3% | 3.2% | 3.2% |
| GOOG | Alphabet Inc Class C | 2.7% | 2.9% | 2.7% |
| META | Meta Platforms Inc Class A | 2.1% | 2.2% | 2.1% |
| TSLA | Tesla Inc | 1.9% | 1.7% | 1.7% |
| Sector | IVV | VOO | Overlap |
|---|---|---|---|
| Technology | 39% | 35.7% | 35.7% |
| Financial Services | 11.1% | 11.6% | 11.1% |
| Communication Services | 10.6% | 11.3% | 10.6% |
| Consumer Discretionary | 9.9% | 10.2% | 9.9% |
| Health Care | 8.3% | 8.5% | 8.3% |
| Industrials | 7.8% | 8.3% | 7.8% |
| Consumer Staples | 4.5% | 4.9% | 4.5% |
| Energy | 3.1% | 3.5% | 3.1% |
| Utilities | 2.1% | 2.4% | 2.1% |
| Real Estate | 1.8% | 1.9% | 1.8% |
| Materials | 1.7% | 1.8% | 1.7% |
Holdings overlap sums min(weight in fund A, weight in fund B) across positions that appear in both funds' disclosed top-holdings lists — public data discloses only each fund's largest positions, so this number is a lower bound on true full-portfolio overlap. Sector overlap applies the same min() logic to the funds' complete sector allocations, which cover ~100% of each fund, making it the more complete signal of duplication.
The largest IVV positions missing from VOO's disclosed top holdings are MU. In the other direction, VOO's largest positions not in IVV's top list are BRK-B. Disclosed lists cover 39.2% of IVV and 38.4% of VOO; the sector table below compares the funds on complete data.
Fund holdings change over time. Open IVV vs VOO in the interactive ETF overlap calculator for a fresh comparison — or swap in any other tickers.
This tool is for education, not investment advice. Holdings and sector data come from public market-data feeds, reflect each fund's most recently disclosed top positions, and can lag the fund's actual portfolio. Overlap computed from disclosed top holdings is a lower bound. Always verify against the fund provider's official holdings file before making decisions.
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