State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) is a US mid-cap ETF. As of October 9, 2026, ETF Copilot scores MDY 4.3 out of 10 — highest on Value (5.5), lowest on Quality (2.4). It trades at 19.4 times earnings, against its own median of 18.9. Its ten largest holdings are 7% of the fund.
What stands out in MDY's data
U.S. mid-cap stocks, weighted by market value.
Earns less on its capital than the typical mid-cap fund — a drag that compounds over time.
Return on invested capital of 13.4% trails the 14.7% category median. Holdings 397 stocks. trailing P/E multiple of 19.4x sits near the peer average.
A broad mid-cap building block for a portfolio already anchored in large and small caps.
How is MDY rated? ETF Copilot scores State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) 4.3 out of 10
As of October 9, 2026, ETF Copilot scores State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) 4.3 out of 10 overall.
ETF Copilot scores (0–10 scale, higher is better):
- Overall: 4.3 / 10
- Growth: 4.3 / 10
- Value: 5.5 / 10
- Risk: 5.2 / 10
- Quality: 2.4 / 10
- Return: 4.3 / 10
Is MDY expensive right now? It trades at 19.4 times earnings, against its own median of 18.9
As of October 9, 2026, MDY is more expensive than 56% of its own 115 monthly readings since 2017 — 64 of those months were cheaper than today.
Trailing twelve-month, computed by ETF Copilot from the fund's holdings rather than quoted from a data provider, and rebuilt nightly.
What's inside MDY? 18% Tech
What's inside MDY: Size (Large 1%, Mid 90%, Small 9%); Geography (International 4%, US 96%); Tech 17.7%; AI 0.5%; Semiconductors 5.0%; Memory 1.2%.
What are MDY's top holdings? The ten largest are 7% of the fund
Okta, U.S. Dollar, Technipfmc, Nvent Electric, ATI, Entegris, United Therapeutics, Macom Technology Solutions, Synnex and XPO are MDY's largest holdings, in that order.
Less concentrated than 68% of US Mid Cap ETFs.
Half of MDY's weight sits in its 114 largest positions, and once those weights are taken into account it behaves like 294 equally weighted holdings.
What is MDY's expense ratio? 0.23% a year
As of October 9, 2026, MDY charges 0.23% a year, yields 1.05% and holds $25.6B in assets across 397 positions.
| Measure | MDY |
|---|---|
| Expense ratio | 0.23% |
| Dividend yield | 1.05% |
| Assets under management | $25.6B |
| Holdings | 397 |
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.
Cite this
ETF Copilot, “State Street SPDR S&P MIDCAP 400 ETF Trust (MDY) scores and holdings analysis”, as of October 9, 2026.
https://etf-copilot.com/etf/mdy
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