ETF comparison
MDYvsSPMD
Both US Mid Cap.
State Street SPDR S&P MIDCAP 400 ETF Trust · State Street SPDR Portfolio S&P 400 Mid Cap ETF
Holdings overlap
377 positions appear in both funds. Buying equal dollars of MDY and SPMD would leave roughly85.5%of each dollar exposed to the same underlying securities.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — seewhat we don't scorefor why.
Cost difference
SPMD is 20 bps cheaper than MDY. On a $100,000 position that's about $200/yr more in fees for MDY.
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open thecost calculator pre-filled with MDY vs SPMD.
Top shared holdings
377 shared in total| # | Holding | In MDY | In SPMD | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc. Class A | 1.01% | 0.86% | 0.86% |
| 2 | ATI Inc | 0.77% | 0.74% | 0.74% |
| 3 | Illumina Inc. | 0.93% | 0.73% | 0.73% |
| 4 | Everpure Inc. Class A | 0.86% | 0.68% | 0.68% |
| 5 | Carpenter Technology Corporation | 0.64% | 0.84% | 0.64% |
| 6 | Okta Inc. Class A | 0.79% | 0.63% | 0.63% |
| 7 | US Foods Holding Corp. | 0.64% | 0.62% | 0.62% |
| 8 | XPO Inc. | 0.60% | 0.66% | 0.60% |
| 9 | Curtiss-Wright Corporation | 0.58% | 0.77% | 0.58% |
| 10 | United Therapeutics Corporation | 0.58% | 0.63% | 0.58% |
| 11 | Woodward Inc. | 0.57% | 0.70% | 0.57% |
| 12 | Entegris Inc. | 0.55% | 0.76% | 0.55% |
Only in MDY
24 total- TechnipFMC plc0.88%
- U.S. Dollar0.77%
- nVent Electric plc0.68%
- Toast Inc. Class A0.44%
- Jazz Pharmaceuticals Public Limited Company0.43%
- Roivant Sciences Ltd.0.43%
- RenaissanceRe Holdings Ltd.0.40%
- Fabrinet0.39%
- Sun Communities Inc.0.38%
- SharkNinja Inc.0.34%
Only in SPMD
24 total- nVent Electric PLC0.76%
- TechnipFMC PLC0.73%
- Fabrinet0.55%
- Roivant Sciences Ltd0.44%
- Jazz Pharmaceuticals PLC0.42%
- RenaissanceRe Holdings Ltd0.37%
- Webster Financial Corp0.34%
- SharkNinja Inc0.30%
- TopBuild Corp0.27%
- CNH Industrial NV0.27%
Open MDY or SPMD at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodologyand funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions matched on ISIN (CUSIP fallback). Methodology: see/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.