MDY
US Mid CapState Street SPDR S&P MIDCAP 400 ETF Trust
State Street · Tracks S&P MidCap 400 Index · Inception May 4, 1995
Trailing returns
through Oct 23, 2026- 1 year
- +13.2%
- 3 year
- +16.7%
- annualized
- 5 year
- +6.8%
- annualized
Price return from month-end closes, distributions reinvested at month end. Excludes trading costs, bid-ask spreads and taxes. Past performance says nothing about future returns and is not part of the composite score — see the methodology for what the score does measure.
Composite score
Based on a 0.23% expense ratio.
Based on $25.22B in net assets.
Top-10 holdings represent 7.2% of net assets.
US Mid Cap base · ETF wrapper · 1.06% TTM yield.
Tracking error vs. the largest catalog peer tracking the same index. Not yet part of the composite — see methodology.
The composite is a weighted average of the four core sub-scores above (cost, tax efficiency, liquidity, concentration). Missing sub-scores fall back to the per-category median when the category has at least 50% data coverage, so funds without (e.g.) parsed N-PORT holdings aren't accidentally boosted by renormalization. Tracking quality is shown where computable but isn't currently part of the composite weighting. See methodology for formulas, the tracking-quality partial-coverage rationale, and the dimensions we deliberately don't score (methodology v0.5.2).
Look through MDY, or compare the fee
Tool · Look-through
Underlying holdings, with other funds added
Add tickers and weights; N-PORT positions are summed across the basket.
Tool · Cost
Compare MDY's fee against another fund
Compounds the 0.23% expense ratio against a peer over decades.
Tool · Overlap
Compare MDY's holdings with peers
Pairwise holdings heatmap, pre-loaded with similar US Mid Cap funds.
Tool · TLH
Find a tax-loss harvesting partner for MDY
Ranks every catalog fund by holdings overlap, flags wash-sale risk.
Tool · Placement
Asset location for MDY across account types
Asset-location optimizer — places each fund in taxable / tax-deferred / Roth.
Top holdings
| # | Holding | Weight |
|---|---|---|
| 1 | Okta Inc. Class A | 0.97% |
| 2 | U.S. Dollar | 0.96% |
| 3 | TechnipFMC plc | 0.76% |
| 4 | United Therapeutics Corporation | 0.73% |
| 5 | US Foods Holding Corp. | 0.66% |
| 6 | XPO Inc. | 0.64% |
| 7 | ATI Inc | 0.64% |
| 8 | Tenet Healthcare Corporation | 0.63% |
| 9 | Reliance Inc. | 0.62% |
| 10 | Roku Inc. Class A | 0.62% |
Holdings from the issuer's published daily file (as of Oct 22, 2026) — this fund does not file usable N-PORT holdings.
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