IWO vs VIOV: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VIOVVanguard S&P Small-cap 600 Value Index Fund
Vanguard · 460 holdings · $1.9B · as of 2026-05-31
Holdings snapshots are 61 days apart (IWO: 2026-03-31, VIOV: 2026-05-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are IWO and VIOV?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; Vanguard S&P Small-cap 600 Value Index Fund (VIOV, by Vanguard) holds 460. They have 185 holdings in common, and by portfolio weight the two funds are 15.6% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 15.6%Sum of the smaller weight of each shared holding
- Shared Holdings
- 185IWO holds 1101 · VIOV holds 460
- Weight in Shared Holdings
- IWO 18%·VIOV 32%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 IWO
916 of 1101 positions (81.5% of the fund) are not held by VIOV. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | VIOV |
|---|---|---|
| Industrials | 23.7% | 12.6% |
| Health Care | 23.1% | 7.4% |
| Financials | 8.6% | 21.0% |
| Information Technology | 19.0% | 13.3% |
| Consumer Discretionary | 7.3% | 14.9% |
| Other Sectors | 14.1% | 30.3% |
| Unclassified | 4.0% | 0.0% |
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 (4% of IWO, 0% of VIOV).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWO | +1.2% | +21.0% | +34.7% | +17.5% | +5.9% | +11.0% | 0.42% |
| VIOV | +3.7% | +23.2% | +39.7% | +13.8% | +8.4% | +10.4% | 1.64% |
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 IWO vs VIOV →
Shared Holdings(185)
The top 10 shared positions account for 19% of the overlap, led by SMTC, LUMN and PLXS.
 SMTCSemtech Corporation COM | 0.48% | 0.49% | 0.48% |
|---|---|---|---|
 LUMNLumen Technologies Inc COM | 0.39% | 0.66% | 0.39% |
 PLXSPlexus Corp COM | 0.34% | 0.47% | 0.34% |
 PIPRPiper Sandler Companies COM NEW | 0.36% | 0.28% | 0.28% |
 SKYChampion Homes Inc. COM | 0.28% | 0.26% | 0.26% |
 MCMoelis & Co., Class A | 0.25% | 0.25% | 0.25% |
 LRNStride Inc COM | 0.25% | 0.45% | 0.25% |
 BCPCBalchem Corp COM | 0.37% | 0.24% | 0.24% |
 SFBSServisFirst Bancshares Inc. COM | 0.25% | 0.23% | 0.23% |
 CSWCSW Industrials Inc. COM | 0.28% | 0.22% | 0.22% |
 CCThe Chemours Company LLC COM | 0.22% | 0.39% | 0.22% |
 KAIKadant Inc COM | 0.23% | 0.21% | 0.21% |
 GKOSGlaukos Corp. COM | 0.40% | 0.21% | 0.21% |
 ITGRInteger Holdings Corp. COM | 0.20% | 0.37% | 0.20% |
 FELEFranklin Electric Co Inc COM | 0.24% | 0.20% | 0.20% |
 KTBKontoor Brands Inc COM | 0.21% | 0.20% | 0.20% |
 PATKPatrick Industries Inc. COM | 0.24% | 0.19% | 0.19% |
 POWIPower Integrations Inc. COM | 0.19% | 0.54% | 0.19% |
 OIIOceaneering International, Inc. COM | 0.21% | 0.18% | 0.18% |
 BGCBGC Group, Inc., Class A | 0.24% | 0.18% | 0.18% |
 ACIWACI Worldwide Inc COM | 0.28% | 0.18% | 0.18% |
 OUTOUTFRONT Media Inc COM NEW | 0.26% | 0.17% | 0.17% |
 WHDCactus, Inc., Class A | 0.22% | 0.17% | 0.17% |
 CAKECheesecake Factory, Inc. (The) | 0.17% | 0.17% | 0.17% |
 GFFGriffon Corp COM | 0.19% | 0.16% | 0.16% |
Frequently Asked Questions
How much do IWO and VIOV overlap?
IWO and VIOV overlap by 15.6% of portfolio weight. They share 185 holdings (IWO holds 1101 positions and VIOV holds 460), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and VIOV?
The two portfolios are 15.6% identical by weight. Owning both is not redundant. Most of each portfolio is distinct, so the funds can serve different roles.
What are the biggest shared holdings of IWO and VIOV?
The largest positions held by both funds are SMTC, LUMN, PLXS, PIPR and SKY. Together the top 10 shared positions account for 19% of the total overlap.
What does IWO own that VIOV doesn't?
916 positions (81.5% of IWO) are unique to IWO, led by BE, FN and CRDO. In the other direction, 275 positions (67.3% of VIOV) are unique to VIOV.