IWM vs IWO: holdings overlap, shared companies and scores
As of October 9, 2026, IWM and IWO overlap 56.0% by weight. iShares Russell 2000 ETF (IWM): Russell 2000 index. iShares Russell 2000 Growth ETF (IWO): Russell 2000 Growth index.
Updated October 9, 2026
Where IWM and IWO trade against their own history
IWM trades at 16.7 times earnings, against its own median of 17.1, and is cheaper than 60% of its own last 9 years.
IWO trades at 22.8 times earnings, against its own median of 22.7, and is more expensive than 51% of its own last 9 years.
What moved IWM and IWO this week
IWM fell 0.9% in the week to October 9, 2026. The holdings that moved it most were Twist Bioscience (−15.3%), 10X Genomics (−13.7%) and AXT (−20.3%); Vaxcyte (+26.4%) pushed the other way.
IWO fell 1.1% in the week to October 9, 2026. The holdings that moved it most were Twist Bioscience (−15.3%), 10X Genomics (−13.7%) and AXT (−20.3%); Vaxcyte (+26.4%) pushed the other way.
What do IWM and IWO each hold?
What's inside IWM: Tech 15%, Semiconductors 3%.
3% of IWM is its ten largest holdings.
What's inside IWO: Tech 23%, Semiconductors 5%.
6% of IWO is its ten largest holdings.
How much do IWM and IWO overlap? 56.0% by weight
As of October 9, 2026, IWM and IWO overlap 56.0% by weight.
65% of IWM is already inside IWO.
100% of IWO is already inside IWM.
IWM holds 1,975 companies and IWO holds 1,117; 1,115 are in both.
Computed by ETF Copilot from both funds' holdings rather than quoted from a data provider, and rebuilt nightly.
How does ETF Copilot score IWM and IWO? 3.5 and 4.1 out of 10
As of October 9, 2026, ETF Copilot scores IWM 3.5 out of 10 and IWO 4.1 out of 10.
They differ most on Growth: IWM 3.0 and IWO 6.5.
The five factor scores behind them are set out below, 0–10 and higher is better, ranked against every US equity ETF we track.
| Factor | IWM | IWO |
|---|---|---|
| Growth | 3.0 | 6.5 |
| Value | 7.4 | 6.8 |
| Risk | 2.6 | 1.8 |
| Quality | 0.5 | 0.6 |
| Return | 4.0 | 3.6 |
IWM is the cheaper of the two at 0.19% a year
As of October 9, 2026, IWM charges 0.19% a year, yields 0.97% and holds $78.2B in assets across 1975 positions.
As of October 9, 2026, IWO charges 0.24% a year, yields 0.45% and holds $14.0B in assets across 1117 positions.
| Measure | IWM | IWO |
|---|---|---|
| Expense ratio | 0.19% | 0.24% |
| Dividend yield | 0.97% | 0.45% |
| Assets under management | $78.2B | $14.0B |
| Holdings | 1975 | 1117 |
Expense ratio, dividend yield and assets under management are reported by the fund and refreshed daily. Every other figure on this page is computed by ETF Copilot.
Compare with similar funds
Cite this
ETF Copilot, “IWM vs IWO holdings overlap and scores”, as of October 9, 2026.
https://etf-copilot.com/compare/iwm-vs-iwo
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