IWR vs VO: Holdings Overlap
IWRiShares Russell Mid-Cap ETF
iShares · 806 holdings · $57.6B · as of 2026-03-31
Vanguard · 289 holdings · $109.2B · as of 2026-03-31
How similar are IWR and VO?
iShares Russell Mid-Cap ETF (IWR, by iShares) holds 806 positions; Vanguard Mid-cap Index Fund (VO, by Vanguard) holds 289. They have 238 holdings in common, and by portfolio weight the two funds are 58.2% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 58.2%Sum of the smaller weight of each shared holding
- Shared Holdings
- 238IWR holds 806 · VO holds 289
- Weight in Shared Holdings
- IWR 61%·VO 78%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 IWR
568 of 806 positions (39.0% of the fund) are not held by VO. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWR | VO |
|---|---|---|
| Industrials | 18.7% | 18.4% |
| Information Technology | 13.0% | 14.2% |
| Financials | 13.6% | 13.8% |
| Consumer Discretionary | 10.8% | 9.3% |
| Health Care | 9.2% | 8.3% |
| Other Sectors | 34.3% | 35.7% |
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 |
|---|---|---|---|---|---|---|---|
| IWR | +2.9% | +18.1% | +23.0% | +16.4% | +8.5% | +11.6% | 1.12% |
| 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 IWR vs VO →
Shared Holdings(238)
The top 10 shared positions account for 11% of the overlap, led by VRT, HWM and WDC.
 VRTVertiv Holdings Co., Class A | 0.76% | 1.03% | 0.76% |
|---|---|---|---|
 HWMHowmet Aerospace Inc COM | 0.73% | 1.01% | 0.73% |
 WDCWestern Digital Corp. COM | 0.73% | 1.00% | 0.73% |
 PWRQuanta Services, Inc. COM | 0.64% | 0.89% | 0.64% |
 VLOValero Energy Corp. COM | 0.60% | 0.80% | 0.60% |
 CMICummins Inc. COM | 0.59% | 0.81% | 0.59% |
 MPCMarathon Petroleum Corp. COM | 0.58% | 0.78% | 0.58% |
 PSXPhillips 66 COM | 0.58% | 0.80% | 0.58% |
 GLWCorning Incorporated COM | 0.84% | 0.57% | 0.57% |
 RCLRoyal Caribbean Group COM USD0.01 | 0.55% | 0.73% | 0.55% |
 ROSTRoss Stores Inc COM | 0.55% | 0.76% | 0.55% |
 NETCloudflare, Inc., Class A | 0.51% | 0.68% | 0.51% |
 LHXL3 Harris Technologies Inc COM | 0.51% | 0.70% | 0.51% |
 WBDWarner Bros. Discovery Inc. COM SER A | 0.51% | 0.70% | 0.51% |
 DLRDigital Realty Trust Inc. COM | 0.49% | 0.67% | 0.49% |
 BKRBaker Hughes Co., Class A | 0.48% | 0.66% | 0.48% |
 LNGCheniere Energy Inc COM NEW | 0.48% | 0.62% | 0.48% |
 CORCencora Inc COM | 0.46% | 0.63% | 0.46% |
 CTVACorteva Inc COM | 0.45% | 0.62% | 0.45% |
 OKEOneok Inc. COM | 0.45% | 0.62% | 0.45% |
 ORealty Income Corporation COM | 0.44% | 0.62% | 0.44% |
 ALLThe Allstate Corporation COM | 0.43% | 0.59% | 0.43% |
 TRGPTarga Resources Corp. COM | 0.42% | 0.59% | 0.42% |
 FASTFastenal Co. COM | 0.42% | 0.58% | 0.42% |
 HOODRobinhood Markets, Inc., Class A | 0.42% | 0.60% | 0.42% |
Frequently Asked Questions
How much do IWR and VO overlap?
IWR and VO overlap by 58.2% of portfolio weight. They share 238 holdings (IWR holds 806 positions and VO holds 289), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWR and VO?
The two portfolios are 58.2% 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 IWR and VO?
The largest positions held by both funds are VRT, HWM, WDC, PWR and VLO. Together the top 10 shared positions account for 11% of the total overlap.
What does IWR own that VO doesn't?
568 positions (39.0% of IWR) are unique to IWR, led by SNDK, BNY and AU. In the other direction, 51 positions (22.1% of VO) are unique to VO.