MDY vs SPMD: holdings overlap, shared companies and scores
As of September 11, 2026, MDY and SPMD overlap 99.3% by weight. State Street SPDR S&P MIDCAP 400 ETF Trust (MDY): U.S. mid-cap stocks. State Street SPDR Portfolio S&P 400 Mid Cap ETF (SPMD): U.S. mid-cap equities.
Updated September 11, 2026
How much do MDY and SPMD overlap?
As of September 11, 2026, MDY and SPMD overlap 99.3% by weight.
100% of MDY is already inside SPMD.
99% of SPMD is already inside MDY.
MDY holds 396 companies and SPMD holds 399; 396 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 MDY and SPMD?
As of September 11, 2026, ETF Copilot scores MDY 4.3 out of 10 and SPMD 4.4 out of 10.
They differ most on Return: MDY 4.1 and SPMD 4.4.
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 | MDY | SPMD |
|---|---|---|
| Growth | 6.1 | 6.1 |
| Valuation | 5.1 | 5.3 |
| Risk | 3.7 | 3.5 |
| Quality | 1.9 | 1.9 |
| Return | 4.1 | 4.4 |
SPMD is the cheaper of the two at 0.03% a year
As of September 11, 2026, MDY charges 0.23% a year, yields 1.28% and holds $26.5B in assets across 396 positions.
As of September 11, 2026, SPMD charges 0.03% a year, yields 1.28% and holds $18.6B in assets across 399 positions.
| Measure | MDY | SPMD |
|---|---|---|
| Expense ratio | 0.23% | 0.03% |
| Dividend yield | 1.28% | 1.28% |
| Assets under management | $26.5B | $18.6B |
| Holdings | 396 | 399 |
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 MDY and SPMD trade against their own history
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.
SPMD trades at 20.2 times earnings, against its own median of 18.8, and is more expensive than 68% of its own 114 monthly readings since 2017.
What moved MDY and SPMD this week
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.
SPMD 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 MDY and SPMD each hold?
What's inside MDY: Tech 16%, Semiconductors 4%.
8% of MDY is its ten largest holdings.
What's inside SPMD: Tech 16%, Semiconductors 4%.
8% of SPMD is its ten largest holdings.
Compare with similar funds
Cite this
ETF Copilot, “MDY vs SPMD holdings overlap and scores”, as of September 11, 2026.
https://etf-copilot.com/compare/mdy-vs-spmd
- State Street SPDR S&P MIDCAP 400 ETF Trust (MDY)
- State Street SPDR Portfolio S&P 400 Mid Cap ETF (SPMD)
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