ETF comparison
MDY vs SPMD
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
374 positions appear in both funds. Buying equal dollars of MDY and SPMD would leave roughly 84.4% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for 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 the cost calculator pre-filled with MDY vs SPMD.
Top shared holdings
374 shared in total| # | Holding | In MDY | In SPMD | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc. Class A | 1.30% | 0.86% | 0.86% |
| 2 | ATI Inc | 0.75% | 0.74% | 0.74% |
| 3 | Entegris Inc. | 0.73% | 0.76% | 0.73% |
| 4 | MACOM Technology Solutions Holdings Inc. | 0.64% | 0.69% | 0.64% |
| 5 | United Therapeutics Corporation | 0.67% | 0.63% | 0.63% |
| 6 | Okta Inc. Class A | 1.01% | 0.63% | 0.63% |
| 7 | XPO Inc. | 0.62% | 0.66% | 0.62% |
| 8 | US Foods Holding Corp. | 0.60% | 0.62% | 0.60% |
| 9 | Curtiss-Wright Corporation | 0.58% | 0.77% | 0.58% |
| 10 | Woodward Inc. | 0.56% | 0.70% | 0.56% |
| 11 | Carpenter Technology Corporation | 0.55% | 0.84% | 0.55% |
| 12 | TD SYNNEX Corporation | 0.64% | 0.55% | 0.55% |
Only in MDY
27 total- U.S. Dollar 0.89%
- nVent Electric plc 0.79%
- TechnipFMC plc 0.77%
- Roivant Sciences Ltd. 0.55%
- Fabrinet 0.48%
- Toast Inc. Class A 0.44%
- Jazz Pharmaceuticals Public Limited Company 0.44%
- SharkNinja Inc. 0.44%
- RenaissanceRe Holdings Ltd. 0.39%
- Sun Communities Inc. 0.39%
Only in SPMD
26 total- nVent Electric PLC 0.76%
- Illumina Inc 0.73%
- TechnipFMC PLC 0.73%
- Everpure Inc 0.68%
- Fabrinet 0.55%
- Roivant Sciences Ltd 0.44%
- Jazz Pharmaceuticals PLC 0.42%
- RenaissanceRe Holdings Ltd 0.37%
- Webster Financial Corp 0.34%
- SharkNinja Inc 0.30%
Related comparisons
More comparisons with MDY
- MDY vs IJH · iShares Core S&P Mid-Cap ETF 84.4%
- MDY vs IJK · iShares S&P Mid-Cap 400 Growth ETF 58.0%
- MDY vs IJJ · iShares S&P Mid-Cap 400 Value ETF 57.1%
- MDY vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 55.8%
- MDY vs SCHM · Schwab U.S. Mid-Cap ETF 51.1%
- MDY vs VB · Vanguard Morningstar Small-Cap ETF 43.6%
More comparisons with SPMD
- SPMD vs IJK · iShares S&P Mid-Cap 400 Growth ETF 65.5%
- SPMD vs IJJ · iShares S&P Mid-Cap 400 Value ETF 62.3%
- SPMD vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 57.9%
- SPMD vs SCHM · Schwab U.S. Mid-Cap ETF 54.2%
- SPMD vs VB · Vanguard Morningstar Small-Cap ETF 43.5%
- SPMD vs AVMV · Avantis U.S. Mid Cap Value ETF 24.6%
Percentages are holdings overlap with the named fund.
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 methodology and 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.