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 Nov 10, 2026- 1 year
- +12.9%
- 3 year
- +14.3%
- annualized
- 5 year
- +7.8%
- 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 $25.95B in net assets.
Top-10 holdings represent 7.2% of net assets.
US Mid Cap base · ETF wrapper · 1.04% 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 | U.S. Dollar | 1.09% |
| 2 | ATI Inc | 0.72% |
| 3 | TechnipFMC plc | 0.72% |
| 4 | United Therapeutics Corporation | 0.72% |
| 5 | Royal Gold Inc. | 0.69% |
| 6 | US Foods Holding Corp. | 0.68% |
| 7 | Tenet Healthcare Corporation | 0.67% |
| 8 | Roivant Sciences Ltd. | 0.63% |
| 9 | XPO Inc. | 0.63% |
| 10 | Reliance Inc. | 0.62% |
Holdings from the issuer's published daily file (as of Nov 9, 2026) — this fund does not file usable N-PORT holdings.
Compare MDY with another fund
Or skim the closest-overlap funds below.
Similar ETFs by holdings overlap
Open MDY at a brokerage
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.