IWS vs VOO: Holdings Overlap
IWSiShares Russell Mid-Cap Value ETF
iShares · 712 holdings · $15.9B · as of 2026-03-31
Vanguard · 504 holdings · $1.03T · as of 2026-03-31
How similar are IWS and VOO?
iShares Russell Mid-Cap Value ETF (IWS, by iShares) holds 712 positions; Vanguard 500 Index Fund (VOO, by Vanguard) holds 504. They have 277 holdings in common, and by portfolio weight the two funds are 13.1% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 13.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 277IWS holds 712 · VOO holds 504
- Weight in Shared Holdings
- IWS 69%·VOO 13%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 IWS
435 of 712 positions (30.7% of the fund) are not held by VOO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWS | VOO |
|---|---|---|
| Information Technology | 12.3% | 32.7% |
| Industrials | 17.1% | 9.0% |
| Financials | 15.1% | 12.4% |
| Communication Services | 3.2% | 10.5% |
| Consumer Discretionary | 7.8% | 9.9% |
| Other Sectors | 44.0% | 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 |
|---|---|---|---|---|---|---|---|
| IWS | +3.3% | +22.1% | +29.8% | +16.6% | +9.8% | +10.4% | 1.27% |
| 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 IWS vs VOO →
Shared Holdings(277)
The top 10 shared positions account for 11% of the overlap, led by GLW, SNDK and WDC.
 GLWCorning Incorporated COM | 1.08% | 0.19% | 0.19% |
|---|---|---|---|
 SNDKSandisk Corporation COM | 0.92% | 0.17% | 0.17% |
 WDCWestern Digital Corp. COM | 0.94% | 0.16% | 0.16% |
 PWRQuanta Services, Inc. COM | 0.19% | 0.15% | 0.15% |
 BNYThe Bank of New York Mellon Corp. COM | 0.77% | 0.15% | 0.15% |
 VLOValero Energy Corp. COM | 0.76% | 0.13% | 0.13% |
 CMICummins Inc. COM | 0.75% | 0.13% | 0.13% |
 PSXPhillips 66 COM | 0.69% | 0.13% | 0.13% |
 MPCMarathon Petroleum Corp. COM | 0.75% | 0.13% | 0.13% |
 ROSTRoss Stores Inc COM | 0.56% | 0.13% | 0.13% |
 WBDWarner Bros. Discovery Inc. COM SER A | 0.65% | 0.12% | 0.12% |
 KMIKinder Morgan, Inc. COM | 0.66% | 0.12% | 0.12% |
 LHXL3 Harris Technologies Inc COM | 0.66% | 0.12% | 0.12% |
 SPGSimon Property Group Inc COM | 0.48% | 0.11% | 0.11% |
 BKRBaker Hughes Company CL A | 0.62% | 0.11% | 0.11% |
 DLRDigital Realty Trust Inc. COM | 0.63% | 0.10% | 0.10% |
 OKEOneok Inc. COM | 0.57% | 0.10% | 0.10% |
 CTVACorteva Inc COM | 0.58% | 0.10% | 0.10% |
 ORealty Income Corporation COM | 0.57% | 0.10% | 0.10% |
 HOODRobinhood Markets, Inc., Class A | 0.46% | 0.10% | 0.10% |
 CIENCiena Corporation COM NEW | 0.56% | 0.10% | 0.10% |
 ALLThe Allstate Corporation COM | 0.55% | 0.10% | 0.10% |
 FASTFastenal Co. COM | 0.10% | 0.10% | 0.10% |
 ETREntergy Corporation COM | 0.51% | 0.09% | 0.09% |
 LITELumentum Holdings Inc. COM | 0.47% | 0.09% | 0.09% |
Showing the top 250 of 277 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWS and VOO overlap?
IWS and VOO overlap by 13.1% of portfolio weight. They share 277 holdings (IWS holds 712 positions and VOO holds 504), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWS and VOO?
The two portfolios are 13.1% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IWS and VOO?
The largest positions held by both funds are GLW, SNDK, WDC, PWR and BNY. Together the top 10 shared positions account for 11% of the total overlap.
What does IWS own that VOO doesn't?
435 positions (30.7% of IWS) are unique to IWS, led by AU, FERG and LNG. In the other direction, 227 positions (86.5% of VOO) are unique to VOO.