IWS vs VO: Holdings Overlap
IWSiShares Russell Mid-Cap Value ETF
iShares · 712 holdings · $15.9B · as of 2026-03-31
Vanguard · 289 holdings · $109.2B · as of 2026-03-31
How similar are IWS and VO?
iShares Russell Mid-Cap Value ETF (IWS, by iShares) holds 712 positions; Vanguard Mid-cap Index Fund (VO, by Vanguard) holds 289. They have 201 holdings in common, and by portfolio weight the two funds are 55.2% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 55.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 201IWS holds 712 · VO holds 289
- Weight in Shared Holdings
- IWS 59%·VO 65%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
511 of 712 positions (41.1% of the fund) are not held by VO. Showing the top 30 by weight.
Only in VO
88 of 289 positions (34.7% of the fund) are not held by IWS. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWS | VO |
|---|---|---|
| Industrials | 17.1% | 18.4% |
| Financials | 15.1% | 13.8% |
| Information Technology | 12.3% | 14.2% |
| Consumer Discretionary | 7.8% | 9.3% |
| Utilities | 7.5% | 8.8% |
| Other Sectors | 39.8% | 35.1% |
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 |
|---|---|---|---|---|---|---|---|
| IWS | +3.3% | +22.1% | +29.8% | +16.6% | +9.8% | +10.4% | 1.27% |
| VO | +2.6% | +14.8% | +18.0% | +15.7% | +8.0% | +11.6% | 1.29% |
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 VO →
Shared Holdings(201)
The top 10 shared positions account for 13% of the overlap, led by WDC, VLO and CMI.
 WDCWestern Digital Corp. COM | 0.94% | 1.00% | 0.94% |
|---|---|---|---|
 VLOValero Energy Corp. COM | 0.76% | 0.80% | 0.76% |
 CMICummins Inc. COM | 0.75% | 0.81% | 0.75% |
 MPCMarathon Petroleum Corp. COM | 0.75% | 0.78% | 0.75% |
 PSXPhillips 66 COM | 0.69% | 0.80% | 0.69% |
 LHXL3 Harris Technologies Inc COM | 0.66% | 0.70% | 0.66% |
 WBDWarner Bros. Discovery Inc. COM SER A | 0.65% | 0.70% | 0.65% |
 DLRDigital Realty Trust Inc. COM | 0.63% | 0.67% | 0.63% |
 BKRBaker Hughes Company CL A | 0.62% | 0.66% | 0.62% |
 CTVACorteva Inc COM | 0.58% | 0.62% | 0.58% |
 OKEOneok Inc. COM | 0.57% | 0.62% | 0.57% |
 GLWCorning Incorporated COM | 1.08% | 0.57% | 0.57% |
 ORealty Income Corporation COM | 0.57% | 0.62% | 0.57% |
 ROSTRoss Stores Inc COM | 0.56% | 0.76% | 0.56% |
 ALLThe Allstate Corporation COM | 0.55% | 0.59% | 0.55% |
 EAElectronic Arts Inc. COM | 0.52% | 0.56% | 0.52% |
 ETREntergy Corporation COM | 0.51% | 0.55% | 0.51% |
 EXCExelon Corp. COM | 0.50% | 0.54% | 0.50% |
 AMEAmetek, Inc. COM | 0.50% | 0.53% | 0.50% |
 KEYSKeysight Technologies, Inc. COM | 0.49% | 0.53% | 0.49% |
 XELXcel Energy Inc COM | 0.48% | 0.54% | 0.48% |
 TERTeradyne Inc. COM | 0.47% | 0.51% | 0.47% |
 URIUnited Rentals, Inc. COM | 0.47% | 0.50% | 0.47% |
 OXYOccidental Petroleum Corp. COM | 0.47% | 0.52% | 0.47% |
 HOODRobinhood Markets, Inc., Class A | 0.46% | 0.60% | 0.46% |
Frequently Asked Questions
How much do IWS and VO overlap?
IWS and VO overlap by 55.2% of portfolio weight. They share 201 holdings (IWS holds 712 positions and VO holds 289), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWS and VO?
The two portfolios are 55.2% identical by weight. Owning both is defensible: they share a meaningful core, but each fund adds exposure the other lacks.
What are the biggest shared holdings of IWS and VO?
The largest positions held by both funds are WDC, VLO, CMI, MPC and PSX. Together the top 10 shared positions account for 13% of the total overlap.
What does IWS own that VO doesn't?
511 positions (41.1% of IWS) are unique to IWS, led by SNDK, BNY and AU. In the other direction, 88 positions (34.7% of VO) are unique to VO.