IWM vs SPSM: holdings overlap, shared companies and scores
As of September 11, 2026, IWM and SPSM overlap 46.7% by weight. iShares Russell 2000 ETF (IWM): Russell 2000 index. State Street SPDR Portfolio S&P 600 Small Cap ETF (SPSM): U.S. small-cap equities.
Updated September 11, 2026
How much do IWM and SPSM overlap?
As of September 11, 2026, IWM and SPSM overlap 46.7% by weight.
47% of IWM is already inside SPSM.
82% of SPSM is already inside IWM.
IWM holds 1,951 companies and SPSM holds 597; 535 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 SPSM?
As of September 11, 2026, ETF Copilot scores IWM 4.2 out of 10 and SPSM 4.3 out of 10.
They differ most on Valuation: IWM 8.2 and SPSM 6.6.
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 | SPSM |
|---|---|---|
| Growth | 5.1 | 5.4 |
| Valuation | 8.2 | 6.6 |
| Risk | 2.4 | 3.9 |
| Quality | 0.7 | 1.4 |
| Return | 4.3 | 4.1 |
SPSM is the cheaper of the two at 0.03% a year
As of September 11, 2026, IWM charges 0.19% a year, yields 1.34% and holds $80.5B in assets across 1951 positions.
As of September 11, 2026, SPSM charges 0.03% a year, yields 1.66% and holds $16.4B in assets across 597 positions.
| Measure | IWM | SPSM |
|---|---|---|
| Expense ratio | 0.19% | 0.03% |
| Dividend yield | 1.34% | 1.66% |
| Assets under management | $80.5B | $16.4B |
| Holdings | 1951 | 597 |
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.
Where IWM and SPSM trade against their own history
IWM trades at 16.8 times earnings, against its own median of 16.7, and is more expensive than 56% of its own 114 monthly readings since 2017.
SPSM trades at 17.5 times earnings, against its own median of 16.7, and is more expensive than 69% of its own 108 monthly readings since 2017.
What moved IWM and SPSM this week
IWM fell 2.1% in the week to September 11, 2026. The holdings that moved it most were Servicetitan (−41.3%), Qualys (−13.8%) and Dyne Therapeutics (−27.0%); Maxlinear (+25.4%) pushed the other way.
SPSM fell 1.8% in the week to September 11, 2026. The holdings that moved it most were Paycom Software (−9.0%), Etsy (−11.3%) and Glaukos (−7.3%); Formfactor (+18.8%) pushed the other way.
What do IWM and SPSM each hold?
What's inside IWM: Tech 14%, Semiconductors 2%.
3% of IWM is its ten largest holdings.
What's inside SPSM: Tech 15%, Semiconductors 4%.
5% of SPSM is its ten largest holdings.
Compare with similar funds
Cite this
ETF Copilot, “IWM vs SPSM holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/iwm-vs-spsm
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