IWS vs MDY: holdings overlap, shared companies and scores
As of September 11, 2026, IWS and MDY overlap 23.3% by weight. iShares Russell Mid-Cap Value ETF (IWS): U.S. mid-cap value stocks. State Street SPDR S&P MIDCAP 400 ETF Trust (MDY): U.S. mid-cap stocks.
Updated September 11, 2026
How much do IWS and MDY overlap?
As of September 11, 2026, IWS and MDY overlap 23.3% by weight.
23% of IWS is already inside MDY.
77% of MDY is already inside IWS.
IWS holds 716 companies and MDY holds 396; 279 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 IWS and MDY?
As of September 11, 2026, ETF Copilot scores IWS 4.4 out of 10 and MDY 4.3 out of 10.
They differ most on Growth: IWS 4.4 and MDY 6.1.
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 | IWS | MDY |
|---|---|---|
| Growth | 4.4 | 6.1 |
| Valuation | 6.0 | 5.1 |
| Risk | 4.0 | 3.7 |
| Quality | 2.7 | 1.9 |
| Return | 4.8 | 4.1 |
IWS and MDY all charge 0.23% a year
As of September 11, 2026, IWS charges 0.23% a year, yields 1.84% and holds $15.7B in assets across 716 positions.
As of September 11, 2026, MDY charges 0.23% a year, yields 1.28% and holds $26.5B in assets across 396 positions.
| Measure | IWS | MDY |
|---|---|---|
| Expense ratio | 0.23% | 0.23% |
| Dividend yield | 1.84% | 1.28% |
| Assets under management | $15.7B | $26.5B |
| Holdings | 716 | 396 |
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 IWS and MDY trade against their own history
IWS trades at 18.6 times earnings, against its own median of 17.3, and is more expensive than 61% of its own 114 monthly readings since 2017.
MDY trades at 20.2 times earnings, against its own median of 18.6, and is more expensive than 69% of its own 114 monthly readings since 2017.
What moved IWS and MDY this week
IWS fell 2.3% in the week to September 11, 2026. The holdings that moved it most were Baker Hughes (−7.2%), Workday (−10.3%) and Coinbase Global (−9.1%); Hewlett Packa (+14.1%) pushed the other way.
MDY fell 1.7% in the week to September 11, 2026. The holdings that moved it most were Guidewire Software (−30.5%), Illumina (−6.9%) and Twilio (−5.5%); Semtech (+23.5%) pushed the other way.
What do IWS and MDY each hold?
What's inside IWS: Tech 12%, Semiconductors 1%.
7% of IWS is its ten largest holdings.
What's inside MDY: Tech 16%, Semiconductors 4%.
8% of MDY is its ten largest holdings.
Compare with similar funds
Cite this
ETF Copilot, “IWS vs MDY holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/iws-vs-mdy
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