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