IWO vs VBK: Holdings Overlap
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
VBKVanguard Small-cap Growth Index Fund
Vanguard · 551 holdings · $24.3B · as of 2026-03-31
How similar are IWO and VBK?
iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101 positions; Vanguard Small-cap Growth Index Fund (VBK, by Vanguard) holds 551. They have 268 holdings in common, and by portfolio weight the two funds are 28.9% identical. In practical terms the pair is lightly overlapping, with most of each portfolio distinct.
- Overlap by Weight
- 28.9%Sum of the smaller weight of each shared holding
- Shared Holdings
- 268IWO holds 1101 · VBK holds 551
- Weight in Shared Holdings
- IWO 58%·VBK 30%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
833 of 1101 positions (41.7% of the fund) are not held by VBK. Showing the top 30 by weight.
Sector Breakdown
| Sector | IWO | VBK |
|---|---|---|
| Industrials | 23.7% | 24.6% |
| Health Care | 23.1% | 16.1% |
| Information Technology | 19.0% | 21.6% |
| Consumer Discretionary | 7.3% | 9.9% |
| Financials | 8.6% | 6.1% |
| Other Sectors | 14.1% | 20.6% |
| Unclassified | 4.0% | 0.9% |
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 VBK).
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% |
| VBK | +1.8% | +19.6% | +29.4% | +16.6% | +5.3% | +11.4% | 0.42% |
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 VBK →
Shared Holdings(268)
The top 10 shared positions account for 16% of the overlap, led by FN, BE and NXT.
 FNFabrinet COM USD0.01 | 1.26% | 0.62% | 0.62% |
|---|---|---|---|
 BEBloom Energy Corporation COM CL A | 1.99% | 0.60% | 0.60% |
 NXTNextpower Inc. CLASS A COM | 0.94% | 0.57% | 0.57% |
 CRDOCredo Technology Group Holding Ltd ORDINARY SHARES | 1.02% | 0.51% | 0.51% |
 KTOSKratos Defense & Security Solutions, Inc. COM NEW | 0.86% | 0.43% | 0.43% |
 BBIOBridgebio Pharma Inc COM | 0.79% | 0.43% | 0.43% |
 AEISAdvanced Energy Industries, Inc. COM | 0.82% | 0.41% | 0.41% |
 STRLSterling Infrastructure Inc COM | 0.81% | 0.40% | 0.40% |
 ENSGEnsign Group, Inc. (The) | 0.76% | 0.39% | 0.39% |
 GHGuardant Health Inc COM | 0.77% | 0.38% | 0.38% |
 MODModine Manufacturing Co. COM | 0.76% | 0.38% | 0.38% |
 CDECoeur Mining Inc COM NEW | 0.64% | 0.36% | 0.36% |
 SPXCSPX Technologies, Inc. COM | 0.65% | 0.33% | 0.33% |
 DYDycom Industries, Inc. COM | 0.66% | 0.32% | 0.32% |
 MDGLMadrigal Pharmaceuticals Inc COM | 0.60% | 0.32% | 0.32% |
| Chart Industries Inc COM | 0.63% | 0.31% | 0.31% |
 RMBSRambus Inc. COM | 0.62% | 0.31% | 0.31% |
 ARWRArrowhead Pharmaceuticals Inc COM | 0.57% | 0.28% | 0.28% |
 IONQIonq Inc COM | 0.67% | 0.27% | 0.27% |
 IDCCInterDigital, Inc. COM | 0.52% | 0.26% | 0.26% |
 SITMSitime Corporation COM | 0.52% | 0.26% | 0.26% |
 FORMFormfactor Inc COM | 0.38% | 0.25% | 0.25% |
 PLPlanet Labs PBC, Class A | 0.51% | 0.25% | 0.25% |
 AXSMAxsome Therapeutics Inc. COM | 0.47% | 0.25% | 0.25% |
 ESEESCO Technologies Inc. COM | 0.49% | 0.24% | 0.24% |
Showing the top 250 of 268 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWO and VBK overlap?
IWO and VBK overlap by 28.9% of portfolio weight. They share 268 holdings (IWO holds 1101 positions and VBK holds 551), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWO and VBK?
The two portfolios are 28.9% 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 VBK?
The largest positions held by both funds are FN, BE, NXT, CRDO and KTOS. Together the top 10 shared positions account for 16% of the total overlap.
What does IWO own that VBK doesn't?
833 positions (41.7% of IWO) are unique to IWO, led by MOG-A, WTS and VIAV. In the other direction, 283 positions (69.3% of VBK) are unique to VBK.