IVV vs VOO: how much do they really overlap?
IVV (iShares Core S&P 500 ETF, tracking the S&P 500) and VOO (Vanguard S&P 500 ETF, tracking the S&P 500) overlap by roughly 90% by weight. 10 of IVV's top 10 holdings also appear in VOO. A 50/50 blend of the two behaves like about 52 equally-weighted bets (diversification grade B). In short, the two funds hold nearly the same stocks in nearly the same proportions — owning both is largely redundant.
The same companies, in both funds
These 46 holdings appear in both IVV and VOO. The weight columns show how much of each fund each name represents.
| Holding | in IVV | in VOO |
|---|---|---|
| NVDA NVIDIA CORP | 7.37% | 7.51% |
| AAPL APPLE INC | 7.64% | 6.59% |
| MSFT MICROSOFT CORP | 5.23% | 4.30% |
| AMZN AMAZON.COM INC | 3.60% | 3.62% |
| GOOGL ALPHABET INC CLASS A | 3.05% | 3.25% |
| AVGO BROADCOM INC | 2.87% | 2.77% |
| GOOG ALPHABET INC CLASS C | 2.46% | 2.59% |
| META META PLATFORMS INC CLASS A | 1.85% | 1.92% |
| MU MICRON TECHNOLOGY INC | 1.54% | 2.02% |
| LLY ELI LILLY | 1.43% | 1.47% |
| TSLA TESLA INC | 1.36% | 1.84% |
| JPM JPMORGAN CHASE & CO | 1.47% | 1.26% |
| AMD ADVANCED MICRO DEVICES INC | 1.24% | 1.47% |
| JNJ JOHNSON & JOHNSON | 0.96% | 0.95% |
| V VISA INC CLASS A | 0.95% | 0.87% |
+ 31 more shared holdings.
Only in IVV
iShares Core S&P 500 ETF — US large-cap. Its biggest holdings that VOO doesn’t have:
| BRKB BERKSHIRE HATHAWAY INC CLASS B | 1.46% |
| XOM EXXONMOBIL HOLDINGS CORP | 1.02% |
| TMO THERMO FISHER SCIENTIFIC INC | 0.33% |
| AMGN AMGEN INC | 0.33% |
Only in VOO
Vanguard S&P 500 ETF — US large-cap. Its biggest holdings that IVV doesn’t have:
| BRK.B Berkshire Hathaway Inc. Class B | 1.42% |
| SNDK Sandisk Corp. | 0.52% |
| IBM International Business Machines Corp. | 0.41% |
| MRVL Marvell Technology Inc. | 0.40% |
So — nearly identical. Should you hold both?
IVV and VOO hold nearly the same stocks in nearly the same proportions — owning both is largely redundant. If you already hold IVV, adding VOO mostly increases your bet on the names they share rather than spreading it — a 50/50 blend still behaves like only ~52 equal positions, with the top 10 alone at 37% and the Magnificent Seven at 32%.
Holdings as of — IVV: Jul 30, 2026 (iShares (BlackRock)); VOO: Jun 30, 2026 (Vanguard). Refreshed monthly. Overlap is measured across each fund’s largest holdings (top 50); the diffuse long tail barely moves the math.
See this for YOUR whole portfolio, free →IVV vs VOO — FAQ
- How much do IVV and VOO overlap?
- IVV and VOO overlap by approximately 90% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 10 of IVV's 10 largest holdings are also held by VOO. They share 46 of their listed top holdings in total.
- Is it redundant to hold both IVV and VOO?
- Because they hold nearly the same stocks in nearly the same proportions — owning both is largely redundant, holding both is largely redundant — you mostly duplicate the same megacaps and concentrate rather than diversify. A 50/50 blend has an effective 52 positions and a B diversification grade.
- What does VOO hold that IVV doesn't?
- VOO's largest holdings that IVV doesn't hold include BRK.B, SNDK, IBM, MRVL. Its category is US large-cap, versus IVV's US large-cap.
- Which is more concentrated, IVV or VOO?
- IVV's top 10 holdings are 59% of its listed weight; VOO's are 58%. The more concentrated fund leans harder on its largest names.