IWO vs VB: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VBVanguard Small-cap Index Fund
Vanguard · 1312 holdings · $82.5B · as of 2026-03-31
How similar are IWO and VB?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; Vanguard Small-cap Index Fund (VB, by Vanguard) holds 1312. They have 431 holdings in common, and by portfolio weight the two funds are 18.7% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 18.7%Sum of the smaller weight of each shared holding
- Shared Holdings
- 431IWO holds 1101 · VB holds 1312
- Weight in Shared Holdings
- IWO 77%·VB 20%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
670 of 1101 positions (22.6% of the fund) are not held by VB. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | VB |
|---|---|---|
| Industrials | 23.7% | 21.2% |
| Health Care | 23.1% | 11.6% |
| Information Technology | 19.0% | 13.8% |
| Financials | 8.6% | 13.4% |
| Consumer Discretionary | 7.3% | 10.5% |
| Other Sectors | 14.1% | 28.5% |
| Unclassified | 4.0% | 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 (4% of IWO, 1% of VB).
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% |
| 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 IWO vs VB →
Shared Holdings(431)
The top 10 shared positions account for 11% of the overlap, led by FN, BE and NXT.
 FNFabrinet COM USD0.01 | 1.26% | 0.26% | 0.26% |
|---|---|---|---|
 BEBloom Energy Corporation COM CL A | 1.99% | 0.25% | 0.25% |
 NXTNextpower Inc. CLASS A COM | 0.94% | 0.24% | 0.24% |
 CRDOCredo Technology Group Holding Ltd ORDINARY SHARES | 1.02% | 0.21% | 0.21% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.86% | 0.18% | 0.18% |
 BBIOBridgebio Pharma Inc COM | 0.79% | 0.18% | 0.18% |
 AEISAdvanced Energy Industries, Inc. COM | 0.82% | 0.17% | 0.17% |
 HLHecla Mining Company COM | 0.19% | 0.17% | 0.17% |
 STRLSterling Infrastructure Inc COM | 0.81% | 0.17% | 0.17% |
 ENSGEnsign Group, Inc. (The) | 0.76% | 0.16% | 0.16% |
 GHGuardant Health Inc COM | 0.77% | 0.16% | 0.16% |
 MODModine Manufacturing Co. COM | 0.76% | 0.16% | 0.16% |
 CDECoeur Mining Inc COM NEW | 0.64% | 0.15% | 0.15% |
 SPXCSPX Technologies, Inc. COM | 0.65% | 0.14% | 0.14% |
 DYDycom Industries, Inc. COM | 0.66% | 0.14% | 0.14% |
 MDGLMadrigal Pharmaceuticals Inc COM | 0.60% | 0.13% | 0.13% |
| Chart Industries Inc COM | 0.63% | 0.13% | 0.13% |
 RMBSRambus Inc. COM | 0.62% | 0.13% | 0.13% |
 AHRAmerican Healthcare REIT Inc. COM SHS | 0.20% | 0.12% | 0.12% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.57% | 0.12% | 0.12% |
 MOG-AMoog, Inc., Class A | 0.55% | 0.12% | 0.12% |
 IONQIonq Inc COM | 0.67% | 0.11% | 0.11% |
 WTSWatts Water Technologies, Inc., Class A | 0.53% | 0.11% | 0.11% |
 IDCCInterDigital, Inc. COM | 0.52% | 0.11% | 0.11% |
 SITMSitime Corporation COM | 0.52% | 0.11% | 0.11% |
Showing the top 250 of 431 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWO and VB overlap?
IWO and VB overlap by 18.7% of portfolio weight. They share 431 holdings (IWO holds 1101 positions and VB holds 1312), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and VB?
The two portfolios are 18.7% 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 VB?
The largest positions held by both funds are FN, BE, NXT, CRDO and KTOS. Together the top 10 shared positions account for 11% of the total overlap.
What does IWO own that VB doesn't?
670 positions (22.6% of IWO) are unique to IWO, led by XENE, KGS and AAOI. In the other direction, 881 positions (80.0% of VB) are unique to VB.