ETF comparison
MDY vs SPYM
US Mid Cap vs US Large Cap.
State Street SPDR S&P MIDCAP 400 ETF Trust · State Street SPDR Portfolio S&P 500 ETF
Holdings overlap
0 positions appear in both funds. Buying equal dollars of MDY and SPYM would leave roughly 0.0% 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
SPYM is 21 bps cheaper than MDY. On a $100,000 position that's about $210/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 SPYM.
Top shared holdings
0 shared in totalNo shared holdings between these funds.
Only in MDY
401 total- Twilio Inc. Class A 1.30%
- Okta Inc. Class A 1.01%
- U.S. Dollar 0.89%
- nVent Electric plc 0.79%
- TechnipFMC plc 0.77%
- ATI Inc 0.75%
- Entegris Inc. 0.73%
- United Therapeutics Corporation 0.67%
- MACOM Technology Solutions Holdings Inc. 0.64%
- TD SYNNEX Corporation 0.64%
Only in SPYM
506 total- NVIDIA Corp 7.51%
- Apple Inc 6.59%
- Microsoft Corp 4.29%
- Amazon.com Inc 3.62%
- Alphabet Inc 3.25%
- Broadcom Inc 2.77%
- Alphabet Inc 2.59%
- Micron Technology Inc 2.02%
- Meta Platforms Inc 1.92%
- Tesla Inc 1.83%
Related comparisons
More comparisons with MDY
- MDY vs VOO · Vanguard S&P 500 ETF 0.0%
- MDY vs VTV · Vanguard Morningstar Value ETF 0.0%
- MDY vs IVOO · Vanguard S&P Mid-Cap 400 Index Fund ETF Shares 87.1%
- MDY vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 84.4%
- 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%
More comparisons with SPYM
- SPYM vs SCHY · Schwab International Dividend Equity ETF 0.0%
- SPYM vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 0.0%
- SPYM vs SPSM · State Street SPDR Portfolio S&P 600 Small Cap ETF 0.0%
- SPYM vs VIGI · Vanguard International Dividend Appreciation Index Fund ETF Shares 0.0%
- SPYM vs VIOG · Vanguard S&P Small-Cap 600 Growth Index Fund ETF Shares 0.0%
- SPYM vs VIOO · Vanguard S&P Small-Cap 600 Index Fund ETF Shares 0.0%
Percentages are holdings overlap with the named fund.
Open MDY or SPYM 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.