IWB vs VOO: Holdings Overlap
iShares · 1005 holdings · $49.9B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are IWB and VOO?
iShares Russell 1000 ETF (IWB, by iShares) holds 1005 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 497 holdings in common, and by portfolio weight the two funds are 92.3% identical. In practical terms the pair is essentially interchangeable, so holding both adds little diversification.
- Overlap by Weight
- 92.3%Sum of the smaller weight of each shared holding
- Shared Holdings
- 497IWB holds 1005 · VOO holds 504
- Weight in Shared Holdings
- IWB 92%·VOO 99%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 IWB
508 of 1005 positions (7.5% of the fund) are not held by VOO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWB | VOO |
|---|---|---|
| Information Technology | 30.9% | 32.7% |
| Financials | 12.9% | 12.4% |
| Communication Services | 10.2% | 10.5% |
| Consumer Discretionary | 10.0% | 9.9% |
| Industrials | 9.9% | 9.0% |
| Other Sectors | 26.0% | 25.3% |
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 |
|---|---|---|---|---|---|---|---|
| IWB | +3.4% | +13.9% | +23.1% | +20.9% | +12.6% | +15.0% | 0.89% |
| 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 IWB vs VOO →
Shared Holdings(497)
The top 10 shared positions account for 36% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 6.81% | 7.58% | 6.81% |
|---|---|---|---|
 AAPLApple Inc. COM | 6.10% | 6.66% | 6.10% |
 MSFTMicrosoft Corp. COM | 4.58% | 4.91% | 4.58% |
 AMZNAmazon.com, Inc. COM | 3.33% | 3.64% | 3.33% |
 GOOGLAlphabet Inc. CAP STK CL A | 2.79% | 2.99% | 2.79% |
 AVGOBroadcom Inc COM | 2.39% | 2.62% | 2.39% |
 GOOGAlphabet Inc. CAP STK CL C | 2.27% | 2.40% | 2.27% |
 METAMeta Platforms, Inc., Class A | 2.08% | 2.24% | 2.08% |
 TSLATesla Inc COM | 1.75% | 1.87% | 1.75% |
 BRK-BBerkshire Hathaway, Inc., Class B | 1.47% | 1.57% | 1.47% |
 JPMJPMorgan Chase & Co. COM | 1.33% | 1.34% | 1.33% |
 LLYEli Lilly & Co. COM | 1.23% | 1.30% | 1.23% |
 XOMExxon Mobil Corp. COM | 1.20% | 1.27% | 1.20% |
 JNJJohnson & Johnson COM | 0.98% | 1.05% | 0.98% |
 WMTWalmart Inc COM | 0.90% | 0.97% | 0.90% |
 VVisa, Inc., Class A | 0.85% | 0.89% | 0.85% |
 COSTCostco Wholesale Corporation COM | 0.74% | 0.79% | 0.74% |
 NFLXNetflix, Inc. COM | 0.68% | 0.73% | 0.68% |
 MAMasterCard Incorporated CL A | 0.67% | 0.73% | 0.67% |
 CVXChevron Corp. COM | 0.65% | 0.69% | 0.65% |
 ABBVAbbVie Inc. COM | 0.64% | 0.69% | 0.64% |
 MUMicron Technology Inc. COM | 0.63% | 0.68% | 0.63% |
 PGThe Procter & Gamble Co. COM | 0.57% | 0.60% | 0.57% |
 CATCaterpillar Inc COM | 0.55% | 0.59% | 0.55% |
 AMDAdvanced Micro Devices Inc. COM | 0.55% | 0.59% | 0.55% |
Showing the top 250 of 497 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWB and VOO overlap?
IWB and VOO overlap by 92.3% of portfolio weight. They share 497 holdings (IWB holds 1005 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWB and VOO?
The two portfolios are 92.3% 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 IWB and VOO?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 36% of the total overlap.
What does IWB own that VOO doesn't?
508 positions (7.5% of IWB) are unique to IWB, led by MRVL, SPOT and NET. In the other direction, 7 positions (0.4% of VOO) are unique to VOO.