ITOT vs VOOG: how much do they really overlap?
ITOT (iShares Core S&P Total US Stock Market ETF, tracking the S&P Total Market) and VOOG (Vanguard S&P 500 Growth ETF, tracking the S&P 500 Growth) overlap by roughly 83% by weight. 10 of ITOT's top 10 holdings also appear in VOOG. A 50/50 blend of the two behaves like about 36 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 34 holdings appear in both ITOT and VOOG. The weight columns show how much of each fund each name represents.
| Holding | in ITOT | in VOOG |
|---|---|---|
| NVDA NVIDIA CORP | 6.54% | 13.64% |
| AAPL APPLE INC | 6.78% | 5.98% |
| MSFT MICROSOFT CORP | 4.64% | 7.80% |
| AMZN AMAZON.COM INC | 3.19% | 3.48% |
| GOOGL ALPHABET INC CLASS A | 2.71% | 5.90% |
| AVGO BROADCOM INC | 2.54% | 5.03% |
| GOOG ALPHABET INC CLASS C | 2.18% | 4.70% |
| META META PLATFORMS INC CLASS A | 1.64% | 3.48% |
| MU MICRON TECHNOLOGY INC | 1.36% | 3.66% |
| JPM JPMORGAN CHASE & CO | 1.30% | 1.56% |
| LLY ELI LILLY | 1.26% | 2.67% |
| TSLA TESLA INC | 1.20% | 2.07% |
| AMD ADVANCED MICRO DEVICES INC | 1.09% | 2.67% |
| JNJ JOHNSON & JOHNSON | 0.85% | 1.02% |
| V VISA INC CLASS A | 0.84% | 0.88% |
+ 19 more shared holdings.
Only in ITOT
iShares Core S&P Total US Stock Market ETF — total US market. Its biggest holdings that VOOG doesn’t have:
| BRKB BERKSHIRE HATHAWAY INC CLASS B | 1.30% |
| XOM EXXONMOBIL HOLDINGS CORP | 0.90% |
| WMT WALMART INC | 0.67% |
| INTC INTEL CORPORATION | 0.60% |
| COST COSTCO WHOLESALE CORP | 0.59% |
| BAC BANK OF AMERICA CORP | 0.56% |
| UNH UNITEDHEALTH GROUP INC | 0.53% |
| CVX CHEVRON CORP | 0.50% |
Only in VOOG
Vanguard S&P 500 Growth ETF — US large-cap growth. Its biggest holdings that ITOT doesn’t have:
| BRK.B Berkshire Hathaway Inc. Class B | 2.58% |
| SNDK Sandisk Corp. | 0.95% |
| APH Amphenol Corp. Class A | 0.61% |
| CRWD Crowdstrike Holdings Inc. Class A | 0.55% |
| ANET Arista Networks Inc. | 0.49% |
| WELL Welltower Inc. | 0.45% |
| UBER Uber Technologies Inc. | 0.41% |
| ISRG Intuitive Surgical Inc. | 0.40% |
So — nearly identical. Should you hold both?
ITOT and VOOG hold nearly the same stocks in nearly the same proportions — owning both is largely redundant. If you already hold ITOT, adding VOOG mostly increases your bet on the names they share rather than spreading it — a 50/50 blend still behaves like only ~36 equal positions, with the top 10 alone at 45% and the Magnificent Seven at 38%.
Holdings as of — ITOT: Jul 30, 2026 (iShares (BlackRock)); VOOG: 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 →ITOT vs VOOG — FAQ
- How much do ITOT and VOOG overlap?
- ITOT and VOOG overlap by approximately 83% measured by portfolio weight — that is the share of the smaller fund's holdings (by weight) that also sit inside the other. 10 of ITOT's 10 largest holdings are also held by VOOG. They share 34 of their listed top holdings in total.
- Is it redundant to hold both ITOT and VOOG?
- 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 36 positions and a B diversification grade.
- What does VOOG hold that ITOT doesn't?
- VOOG's largest holdings that ITOT doesn't hold include BRK.B, SNDK, APH, CRWD, ANET. Its category is US large-cap growth, versus ITOT's total US market.
- Which is more concentrated, ITOT or VOOG?
- ITOT's top 10 holdings are 59% of its listed weight; VOOG's are 64%. The more concentrated fund leans harder on its largest names.