IWM vs IWO: Holdings Overlap
iShares · 1941 holdings · $82.2B · as of 2026-03-31
IWOiShares Russell 2000 Growth ETF
iShares · 1101 holdings · $14.8B · as of 2026-03-31
How similar are IWM and IWO?
iShares Russell 2000 ETF (IWM, by iShares) holds 1941 positions; iShares Russell 2000 Growth ETF (IWO, by iShares) holds 1101. They have 1101 holdings in common, and by portfolio weight the two funds are 56.4% identical. In practical terms the pair is moderately overlapping; they share a meaningful core, but each fund adds distinct exposure.
- Overlap by Weight
- 56.4%Sum of the smaller weight of each shared holding
- Shared Holdings
- 1101IWM holds 1941 · IWO holds 1101
- Weight in Shared Holdings
- IWM 65%·IWO 100%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 IWM
840 of 1941 positions (34.6% of the fund) are not held by IWO. Showing the top 30 by weight.
Only in IWO
Every position in IWO is also held by IWM, so it brings nothing the other fund doesn’t already own.
Sector Breakdown
| Sector | IWM | IWO |
|---|---|---|
| Industrials | 17.9% | 23.7% |
| Health Care | 16.6% | 23.1% |
| Information Technology | 13.6% | 19.0% |
| Financials | 15.3% | 8.6% |
| Consumer Discretionary | 8.0% | 7.3% |
| Other Sectors | 22.7% | 14.1% |
| Unclassified | 5.5% | 4.0% |
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 (5% of IWM, 4% of IWO).
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| IWM | +1.8% | +23.0% | +38.6% | +17.1% | +7.5% | +10.8% | 0.88% |
| IWO | +1.2% | +21.0% | +34.7% | +17.5% | +5.9% | +11.0% | 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 IWM vs IWO →
Shared Holdings(1101)
The top 10 shared positions account for 10% of the overlap, led by BE, CDE and FN.
 BEBloom Energy Corp., Class A | 1.01% | 1.99% | 1.01% |
|---|---|---|---|
 CDECoeur Mining, Inc. | 0.65% | 0.64% | 0.64% |
 FNFabrinet | 0.64% | 1.26% | 0.64% |
 NXTNextpower, Inc., Class A | 0.60% | 0.94% | 0.60% |
 CRDOCredo Technology Group Holding Ltd. | 0.52% | 1.02% | 0.52% |
 KTOSKratos Defense & Security Solutions, Inc. | 0.43% | 0.86% | 0.43% |
 AEISAdvanced Energy Industries, Inc. | 0.41% | 0.82% | 0.41% |
 STRLSterling Infrastructure, Inc. | 0.41% | 0.81% | 0.41% |
 BBIOBridgebio Pharma, Inc. | 0.40% | 0.79% | 0.40% |
 GHGuardant Health, Inc. | 0.39% | 0.77% | 0.39% |
 MODModine Manufacturing Co. | 0.39% | 0.76% | 0.39% |
 ENSGEnsign Group, Inc. (The) | 0.38% | 0.76% | 0.38% |
 IONQIonQ, Inc. | 0.34% | 0.67% | 0.34% |
 DYDycom Industries, Inc. | 0.34% | 0.66% | 0.34% |
 SPXCSPX Technologies, Inc. | 0.33% | 0.65% | 0.33% |
| Chart Industries, Inc. | 0.32% | 0.63% | 0.32% |
 RMBSRambus, Inc. | 0.32% | 0.62% | 0.32% |
 MDGLMadrigal Pharmaceuticals, Inc. | 0.30% | 0.60% | 0.30% |
 ARWRArrowhead Pharmaceuticals, Inc. | 0.29% | 0.57% | 0.29% |
 MOG-AMoog, Inc., Class A | 0.28% | 0.55% | 0.28% |
 WTSWatts Water Technologies, Inc., Class A | 0.27% | 0.53% | 0.27% |
 IDCCInterDigital, Inc. | 0.27% | 0.52% | 0.27% |
 SITMSiTime Corp. | 0.26% | 0.52% | 0.26% |
 PRIMPrimoris Services Corp. | 0.26% | 0.49% | 0.26% |
 VIAVViavi Solutions, Inc. | 0.26% | 0.51% | 0.26% |
Showing the top 250 of 1101 shared holdings by overlap weight.
Frequently Asked Questions
How much do IWM and IWO overlap?
IWM and IWO overlap by 56.4% of portfolio weight. They share 1101 holdings (IWM holds 1941 positions and IWO holds 1101), based on each fund's latest SEC-reported holdings.
Is it redundant to own both IWM and IWO?
The two portfolios are 56.4% 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 IWM and IWO?
The largest positions held by both funds are BE, CDE, FN, NXT and CRDO. Together the top 10 shared positions account for 10% of the total overlap.
What does IWM own that IWO doesn't?
840 positions (34.6% of IWM) are unique to IWM, led by ECHO, TTMI and SM. In the other direction, 0 positions (0.0% of IWO) are unique to IWO.