OEF vs VOO: Holdings Overlap
iShares · 101 holdings · $20.4B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are OEF and VOO?
iShares S&P 100 ETF (OEF, by iShares) holds 101 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 101 holdings in common, and by portfolio weight the two funds are 71.9% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 71.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 101OEF holds 101 · VOO holds 504
- Weight in Shared Holdings
- OEF 100%·VOO 72%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 OEF
Every position in OEF is also held by VOO, so it brings nothing the other fund doesn’t already own.
Sector Breakdown
| Sector | OEF | VOO |
|---|---|---|
| Information Technology | 38.9% | 32.7% |
| Communication Services | 13.5% | 10.5% |
| Financials | 11.2% | 12.4% |
| Consumer Discretionary | 10.2% | 9.9% |
| Health Care | 9.3% | 9.5% |
| Other Sectors | 16.7% | 24.9% |
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 |
|---|---|---|---|---|---|---|---|
| OEF | +4.0% | +12.2% | +23.1% | +23.3% | +14.9% | +16.5% | 0.84% |
| 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 OEF vs VOO →
Shared Holdings(101)
The top 10 shared positions account for 51% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 10.50% | 7.58% | 7.58% |
|---|---|---|---|
 AAPLApple Inc. COM | 9.23% | 6.66% | 6.66% |
 MSFTMicrosoft Corp. COM | 6.81% | 4.91% | 4.91% |
 AMZNAmazon.com, Inc. COM | 5.04% | 3.64% | 3.64% |
 GOOGLAlphabet Inc. CAP STK CL A | 4.15% | 2.99% | 2.99% |
 AVGOBroadcom Inc COM | 3.63% | 2.62% | 2.62% |
 GOOGAlphabet Inc. CAP STK CL C | 3.32% | 2.40% | 2.40% |
 METAMeta Platforms, Inc., Class A | 3.10% | 2.24% | 2.24% |
 TSLATesla Inc COM | 2.59% | 1.87% | 1.87% |
 BRK-BBerkshire Hathaway, Inc., Class B | 2.18% | 1.57% | 1.57% |
 JPMJPMorgan Chase & Co. COM | 1.96% | 1.34% | 1.34% |
 LLYEli Lilly & Co. COM | 1.81% | 1.30% | 1.30% |
 XOMExxon Mobil Corp. COM | 1.76% | 1.27% | 1.27% |
 JNJJohnson & Johnson COM | 1.46% | 1.05% | 1.05% |
 WMTWalmart Inc COM | 1.35% | 0.97% | 0.97% |
 VVisa, Inc., Class A | 1.26% | 0.89% | 0.89% |
 COSTCostco Wholesale Corporation COM | 1.10% | 0.79% | 0.79% |
 MAMasterCard Incorporated CL A | 1.01% | 0.73% | 0.73% |
 NFLXNetflix, Inc. COM | 1.01% | 0.73% | 0.73% |
 CVXChevron Corp. COM | 0.96% | 0.69% | 0.69% |
 ABBVAbbVie Inc. COM | 0.95% | 0.69% | 0.69% |
 MUMicron Technology Inc. COM | 0.94% | 0.68% | 0.68% |
 PGThe Procter & Gamble Co. COM | 0.83% | 0.60% | 0.60% |
 PLTRPalantir Technologies, Inc., Class A | 0.83% | 0.60% | 0.60% |
 AMDAdvanced Micro Devices Inc. COM | 0.82% | 0.59% | 0.59% |
Frequently Asked Questions
How much do OEF and VOO overlap?
OEF and VOO overlap by 71.9% of portfolio weight. They share 101 holdings (OEF holds 101 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both OEF and VOO?
The two portfolios are 71.9% identical by weight. Owning both mostly doubles down on the shared core rather than diversifying: the same large positions drive both funds.
What are the biggest shared holdings of OEF and VOO?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 51% of the total overlap.
What does OEF own that VOO doesn't?
Nothing. Every position in OEF is also held by VOO. In the other direction, 403 positions (27.9% of VOO) are unique to VOO.