ITOT vs VOO: Holdings Overlap
ITOTiShares Core S&P Total U.S. Stock Market ETF
iShares · 2487 holdings · $97.6B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are ITOT and VOO?
iShares Core S&P Total U.S. Stock Market ETF (ITOT, by iShares) holds 2487 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 503 holdings in common, and by portfolio weight the two funds are 88.2% identical. In practical terms the pair is essentially interchangeable, so holding both adds little diversification.
- Overlap by Weight
- 88.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 503ITOT holds 2487 · VOO holds 504
- Weight in Shared Holdings
- ITOT 88%·VOO 100%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in ITOT
1984 of 2487 positions (11.5% of the fund) are not held by VOO. Showing the top 30 by weight.
Only in VOO
1 of 504 positions (0.0% of the fund) are not held by ITOT.
- ABIOMED INC-CVR0.00%
Sector Breakdown
| Sector | ITOT | VOO |
|---|---|---|
| Information Technology | 30.8% | 32.7% |
| Financials | 12.9% | 12.4% |
| Communication Services | 9.7% | 10.5% |
| Industrials | 10.2% | 9.0% |
| Health Care | 9.9% | 9.5% |
| Other Sectors | 26.2% | 25.7% |
Share of each fund's portfolio weight by GICS-style sector, compiled from issuer fund data and our own classification of the holdings, not the issuers' published sector charts.
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| ITOT | +3.3% | +14.6% | +24.1% | +20.9% | +12.3% | +14.9% | 0.97% |
| VOO | +3.4% | +14.0% | +23.7% | +21.3% | +13.4% | +15.4% | 1.03% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in ITOT vs VOO →
Shared Holdings(503)
The top 10 shared positions account for 37% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 6.69% | 7.58% | 6.69% |
|---|---|---|---|
 AAPLApple Inc. COM | 5.88% | 6.66% | 5.88% |
 MSFTMicrosoft Corp. COM | 4.34% | 4.91% | 4.34% |
 AMZNAmazon.com, Inc. COM | 3.21% | 3.64% | 3.21% |
 GOOGLAlphabet Inc. CAP STK CL A | 2.64% | 2.99% | 2.64% |
 AVGOBroadcom Inc COM | 2.32% | 2.62% | 2.32% |
 GOOGAlphabet Inc. CAP STK CL C | 2.12% | 2.40% | 2.12% |
 METAMeta Platforms, Inc., Class A | 1.98% | 2.24% | 1.98% |
 TSLATesla Inc COM | 1.65% | 1.87% | 1.65% |
 BRK-BBerkshire Hathaway, Inc., Class B | 1.39% | 1.57% | 1.39% |
 JPMJPMorgan Chase & Co. COM | 1.25% | 1.34% | 1.25% |
 LLYEli Lilly & Co. COM | 1.15% | 1.30% | 1.15% |
 XOMExxon Mobil Corp. COM | 1.12% | 1.27% | 1.12% |
 JNJJohnson & Johnson COM | 0.93% | 1.05% | 0.93% |
 WMTWalmart Inc COM | 0.86% | 0.97% | 0.86% |
 VVisa, Inc., Class A | 0.80% | 0.89% | 0.80% |
 COSTCostco Wholesale Corporation COM | 0.70% | 0.79% | 0.70% |
 MAMasterCard Incorporated CL A | 0.64% | 0.73% | 0.64% |
 NFLXNetflix, Inc. COM | 0.64% | 0.73% | 0.64% |
 CVXChevron Corp. COM | 0.61% | 0.69% | 0.61% |
 ABBVAbbVie Inc. COM | 0.61% | 0.69% | 0.61% |
 MUMicron Technology Inc. COM | 0.60% | 0.68% | 0.60% |
 PGThe Procter & Gamble Co. COM | 0.53% | 0.60% | 0.53% |
 PLTRPalantir Technologies, Inc., Class A | 0.53% | 0.60% | 0.53% |
 AMDAdvanced Micro Devices Inc. COM | 0.52% | 0.59% | 0.52% |
Showing the top 250 of 503 shared holdings by overlap weight.
Frequently Asked Questions
How much do ITOT and VOO overlap?
ITOT and VOO overlap by 88.2% of portfolio weight. They share 503 holdings (ITOT holds 2487 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both ITOT and VOO?
The two portfolios are 88.2% identical by weight. Owning both is largely redundant: they are close to the same portfolio, so a second position mostly duplicates the first.
What are the biggest shared holdings of ITOT and VOO?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 37% of the total overlap.
What does ITOT own that VOO doesn't?
1984 positions (11.5% of ITOT) are unique to ITOT, led by MRVL, NET and LNG. In the other direction, 1 positions (0.0% of VOO) are unique to VOO.