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 92% by weight. 10 of IVV's top 10 holdings also appear in VOO. A 50/50 blend of the two behaves like about 50 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 48 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 | 7.51% | 7.89% |
| AAPL APPLE INC | 6.58% | 7.05% |
| MSFT MICROSOFT CORP | 4.29% | 5.14% |
| AMZN AMAZON.COM INC | 3.61% | 4.07% |
| GOOGL ALPHABET INC CLASS A | 3.25% | 3.41% |
| AVGO BROADCOM INC | 2.77% | 3.26% |
| GOOG ALPHABET INC CLASS C | 2.59% | 2.71% |
| META META PLATFORMS INC CLASS A | 1.92% | 2.13% |
| TSLA TESLA INC | 1.83% | 1.89% |
| MU MICRON TECHNOLOGY INC | 2.02% | 1.68% |
| LLY ELI LILLY | 1.47% | 1.35% |
| AMD ADVANCED MICRO DEVICES INC | 1.47% | 1.29% |
| JPM JPMORGAN CHASE & CO | 1.36% | 1.16% |
| XOM EXXON MOBIL CORP | 0.88% | 0.93% |
| JNJ JOHNSON & JOHNSON | 0.95% | 0.84% |
+ 33 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 | 1.42% |
| MRVL MARVELL TECHNOLOGY INC | 0.40% |
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 | 1.34% |
| QCOM QUALCOMM Inc. | 0.41% |
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 ~50 equal positions, with the top 10 alone at 38% and the Magnificent Seven at 33%.
Holdings as of — IVV: Jun 30, 2026 (iShares (BlackRock)); VOO: May 31, 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 92% 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 48 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 50 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, QCOM. 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 58% of its listed weight; VOO's are 61%. The more concentrated fund leans harder on its largest names.