IWB vs OEF: Holdings Overlap
iShares · 1005 holdings · $49.9B · as of 2026-03-31
iShares · 101 holdings · $20.4B · as of 2026-03-31
How similar are IWB and OEF?
iShares Russell 1000 ETF (IWB, by iShares) holds 1005 positions; iShares S&P 100 ETF (OEF, by iShares) holds 101. They have 101 holdings in common, and by portfolio weight the two funds are 66.7% identical. In practical terms the pair is heavily overlapping, with largely the same stocks driving both funds.
- Overlap by Weight
- 66.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 101IWB holds 1005 · OEF holds 101
- Weight in Shared Holdings
- IWB 67%·OEF 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 IWB
904 of 1005 positions (33.1% of the fund) are not held by OEF. Showing the top 30 by weight.
Only in OEF
Every position in OEF is also held by IWB, so it brings nothing the other fund doesn’t already own.
Sector Breakdown
| Sector | IWB | OEF |
|---|---|---|
| Information Technology | 30.9% | 38.9% |
| Communication Services | 10.2% | 13.5% |
| Financials | 12.9% | 11.2% |
| Consumer Discretionary | 10.0% | 10.2% |
| Industrials | 9.9% | 5.9% |
| Other Sectors | 26.0% | 20.1% |
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% |
| OEF | +4.0% | +12.2% | +23.1% | +23.3% | +14.9% | +16.5% | 0.84% |
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 OEF →
Shared Holdings(101)
The top 10 shared positions account for 50% of the overlap, led by NVDA, AAPL and MSFT.
 NVDANVIDIA Corp. COM | 6.81% | 10.50% | 6.81% |
|---|---|---|---|
 AAPLApple Inc. COM | 6.10% | 9.23% | 6.10% |
 MSFTMicrosoft Corp. COM | 4.58% | 6.81% | 4.58% |
 AMZNAmazon.com, Inc. COM | 3.33% | 5.04% | 3.33% |
 GOOGLAlphabet Inc. CAP STK CL A | 2.79% | 4.15% | 2.79% |
 AVGOBroadcom Inc COM | 2.39% | 3.63% | 2.39% |
 GOOGAlphabet Inc. CAP STK CL C | 2.27% | 3.32% | 2.27% |
 METAMeta Platforms, Inc., Class A | 2.08% | 3.10% | 2.08% |
 TSLATesla Inc COM | 1.75% | 2.59% | 1.75% |
 BRK-BBerkshire Hathaway, Inc., Class B | 1.47% | 2.18% | 1.47% |
 JPMJPMorgan Chase & Co. COM | 1.33% | 1.96% | 1.33% |
 LLYEli Lilly & Co. COM | 1.23% | 1.81% | 1.23% |
 XOMExxon Mobil Corp. COM | 1.20% | 1.76% | 1.20% |
 JNJJohnson & Johnson COM | 0.98% | 1.46% | 0.98% |
 WMTWalmart Inc COM | 0.90% | 1.35% | 0.90% |
 VVisa, Inc., Class A | 0.85% | 1.26% | 0.85% |
 COSTCostco Wholesale Corporation COM | 0.74% | 1.10% | 0.74% |
 NFLXNetflix, Inc. COM | 0.68% | 1.01% | 0.68% |
 MAMasterCard Incorporated CL A | 0.67% | 1.01% | 0.67% |
 CVXChevron Corp. COM | 0.65% | 0.96% | 0.65% |
 ABBVAbbVie Inc. COM | 0.64% | 0.95% | 0.64% |
 MUMicron Technology Inc. COM | 0.63% | 0.94% | 0.63% |
 PGThe Procter & Gamble Co. COM | 0.57% | 0.83% | 0.57% |
 CATCaterpillar Inc COM | 0.55% | 0.82% | 0.55% |
 AMDAdvanced Micro Devices Inc. COM | 0.55% | 0.82% | 0.55% |
Frequently Asked Questions
How much do IWB and OEF overlap?
IWB and OEF overlap by 66.7% of portfolio weight. They share 101 holdings (IWB holds 1005 positions and OEF holds 101), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWB and OEF?
The two portfolios are 66.7% 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 IWB and OEF?
The largest positions held by both funds are NVDA, AAPL, MSFT, AMZN and GOOGL. Together the top 10 shared positions account for 50% of the total overlap.
What does IWB own that OEF doesn't?
904 positions (33.1% of IWB) are unique to IWB, led by KLAC, TJX and ADI. In the other direction, 0 positions (0.0% of OEF) are unique to OEF.