IWR vs VB: Holdings Overlap
IWRiShares Russell Mid-Cap ETF
iShares · 806 holdings · $57.6B · as of 2026-03-31
VBVanguard Small-cap Index Fund
Vanguard · 1312 holdings · $82.5B · as of 2026-03-31
How similar are IWR and VB?
iShares Russell Mid-Cap ETF (IWR, by iShares) holds 806 positions; Vanguard Small-cap Index Fund (VB, by Vanguard) holds 1312. They have 571 holdings in common, and by portfolio weight the two funds are 41.1% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 41.1%Sum of the smaller weight of each shared holding
- Shared Holdings
- 571IWR holds 806 · VB holds 1312
- Weight in Shared Holdings
- IWR 42%·VB 69%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
235 of 806 positions (58.0% of the fund) are not held by VB. Showing the top 30 by weight.
Only in VB
741 of 1312 positions (30.7% of the fund) are not held by IWR. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWR | VB |
|---|---|---|
| Industrials | 18.7% | 21.2% |
| Information Technology | 13.0% | 13.8% |
| Financials | 13.6% | 13.4% |
| Health Care | 9.2% | 11.6% |
| Consumer Discretionary | 10.8% | 10.5% |
| Other Sectors | 34.3% | 28.5% |
| Unclassified | 0.1% | 0.7% |
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. “Unclassified” is weight we could not classify (0% of IWR, 1% of VB).
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% |
| VB | +2.5% | +19.5% | +29.1% | +15.9% | +8.1% | +11.3% | 1.18% |
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 VB →
Shared Holdings(571)
The top 10 shared positions account for 7% of the overlap, led by CIEN, LITE and FIX.
 CIENCiena Corporation COM NEW | 0.43% | 0.38% | 0.38% |
|---|---|---|---|
 LITELumentum Holdings Inc. COM | 0.39% | 0.35% | 0.35% |
 FIXComfort Systems USA Inc. COM | 0.38% | 0.34% | 0.34% |
 COHRCoherent Corp COM | 0.33% | 0.31% | 0.31% |
 EQTEQT Corporation COM | 0.30% | 0.28% | 0.28% |
 EMEEmcor Group Inc COM | 0.26% | 0.46% | 0.26% |
 RKLBRocket Lab Corp. COM | 0.25% | 0.26% | 0.25% |
 INSMInsmed Inc COM PAR $.01 | 0.27% | 0.25% | 0.25% |
 NRGNRG Energy, Inc. COM NEW | 0.24% | 0.43% | 0.24% |
 ATOAtmos Energy Corp. COM | 0.23% | 0.43% | 0.23% |
 TPRTapestry Inc COM | 0.23% | 0.40% | 0.23% |
 FTITechnipFMC PLC USD1 | 0.22% | 0.39% | 0.22% |
 JBLJabil Inc COM | 0.22% | 0.37% | 0.22% |
 CASYCasey'S General Stores Inc. COM | 0.21% | 0.38% | 0.21% |
 NTRANatera Inc. COM | 0.21% | 0.37% | 0.21% |
 DOWDow Inc COM | 0.23% | 0.21% | 0.21% |
 UTHRUnited Therapeutics Corporation COM | 0.20% | 0.36% | 0.20% |
 CWCurtiss-Wright Corporation | 0.20% | 0.35% | 0.20% |
 FTAIFTAI Aviation Ltd COM USD0.01 | 0.20% | 0.35% | 0.20% |
 EXEExpand Energy Corp. COM | 0.20% | 0.37% | 0.20% |
 TPLTexas Pacific Land Corporation COM | 0.22% | 0.19% | 0.19% |
 FLEXFlex Ltd. COM USD0.01 | 0.19% | 0.34% | 0.19% |
 OMCOmnicom Group Inc COM | 0.19% | 0.33% | 0.19% |
 HUBBHubbell Incorporated COM | 0.21% | 0.18% | 0.18% |
 XPOXPO Inc COM | 0.18% | 0.30% | 0.18% |
Showing the top 250 of 571 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWR and VB overlap?
IWR and VB overlap by 41.1% of portfolio weight. They share 571 holdings (IWR holds 806 positions and VB holds 1312), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWR and VB?
The two portfolios are 41.1% 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 VB?
The largest positions held by both funds are CIEN, LITE, FIX, COHR and EQT. Together the top 10 shared positions account for 7% of the total overlap.
What does IWR own that VB doesn't?
235 positions (58.0% of IWR) are unique to IWR, led by GLW, VRT and HWM. In the other direction, 741 positions (30.7% of VB) are unique to VB.