IWS vs VB: Holdings Overlap
IWSiShares Russell Mid-Cap Value ETF
iShares · 712 holdings · $15.9B · as of 2026-03-31
VBVanguard Small-cap Index Fund
Vanguard · 1312 holdings · $82.5B · as of 2026-03-31
How similar are IWS and VB?
iShares Russell Mid-Cap Value ETF (IWS, by iShares) holds 712 positions; Vanguard Small-cap Index Fund (VB, by Vanguard) holds 1312. They have 510 holdings in common, and by portfolio weight the two funds are 41.6% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 41.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 510IWS holds 712 · VB holds 1312
- Weight in Shared Holdings
- IWS 43%·VB 61%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
202 of 712 positions (56.6% of the fund) are not held by VB. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWS | VB |
|---|---|---|
| Industrials | 17.1% | 21.2% |
| Financials | 15.1% | 13.4% |
| Information Technology | 12.3% | 13.8% |
| Health Care | 7.6% | 11.6% |
| Consumer Discretionary | 7.8% | 10.5% |
| Other Sectors | 39.6% | 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 IWS, 1% of VB).
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% |
| 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 IWS vs VB →
Shared Holdings(510)
The top 10 shared positions account for 7% of the overlap, led by CIEN, LITE and COHR.
 CIENCiena Corporation COM NEW | 0.56% | 0.38% | 0.38% |
|---|---|---|---|
 LITELumentum Holdings Inc. COM | 0.47% | 0.35% | 0.35% |
 COHRCoherent Corp COM | 0.42% | 0.31% | 0.31% |
 ATOAtmos Energy Corp. COM | 0.30% | 0.43% | 0.30% |
 FTITechnipFMC PLC USD1 | 0.28% | 0.39% | 0.28% |
 EQTEQT Corporation COM | 0.39% | 0.28% | 0.28% |
 UTHRUnited Therapeutics Corporation COM | 0.26% | 0.36% | 0.26% |
 CWCurtiss-Wright Corporation | 0.26% | 0.35% | 0.26% |
 EXEExpand Energy Corp. COM | 0.25% | 0.37% | 0.25% |
 FLEXFlex Ltd. COM USD0.01 | 0.24% | 0.34% | 0.24% |
 OMCOmnicom Group Inc COM | 0.24% | 0.33% | 0.24% |
 CASYCasey'S General Stores Inc. COM | 0.23% | 0.38% | 0.23% |
 WWDWoodward Inc. COM | 0.22% | 0.30% | 0.22% |
 EMEEmcor Group Inc COM | 0.22% | 0.46% | 0.22% |
 RGLDRoyal Gold, Inc. COM | 0.22% | 0.30% | 0.22% |
 ALBAlbemarle Corp COM | 0.21% | 0.30% | 0.21% |
 SWSmurfit WestRock plc COM USD0.001 | 0.21% | 0.29% | 0.21% |
 USFDUS Foods Holding Corp COM | 0.21% | 0.28% | 0.21% |
 DOWDow Inc COM | 0.30% | 0.21% | 0.21% |
 CFCF Industries Holdings, Inc. COM | 0.21% | 0.28% | 0.21% |
 ATIATI Inc COM | 0.20% | 0.28% | 0.20% |
 CHRWC.H. Robinson Worldwide Inc COM NEW | 0.20% | 0.28% | 0.20% |
 DDDupont De Nemours Inc COM | 0.19% | 0.26% | 0.19% |
 ILMNIllumina Inc COM | 0.19% | 0.25% | 0.19% |
 NVTNVent Electric PLC COM USD0.01 | 0.19% | 0.27% | 0.19% |
Showing the top 250 of 510 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWS and VB overlap?
IWS and VB overlap by 41.6% of portfolio weight. They share 510 holdings (IWS holds 712 positions and VB holds 1312), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWS and VB?
The two portfolios are 41.6% 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 VB?
The largest positions held by both funds are CIEN, LITE, COHR, ATO and FTI. Together the top 10 shared positions account for 7% of the total overlap.
What does IWS own that VB doesn't?
202 positions (56.6% of IWS) are unique to IWS, led by GLW, WDC and SNDK. In the other direction, 802 positions (38.3% of VB) are unique to VB.