ETF comparison
MDY vs VOO
US Mid Cap vs US Large Cap.
State Street SPDR S&P MIDCAP 400 ETF Trust · Vanguard S&P 500 ETF
Holdings overlap
1 positions appear in both funds. Buying equal dollars of MDY and VOO would leave roughly 0.1% 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
VOO 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 VOO.
Top shared holdings
1 shared in total| # | Holding | In MDY | In VOO | Overlap |
|---|---|---|---|---|
| 1 | Corteva Inc | 0.23% | 0.09% | 0.09% |
Only in MDY
400 total- U.S. Dollar 0.77%
- United Therapeutics Corporation 0.75%
- TechnipFMC plc 0.72%
- ATI Inc 0.70%
- US Foods Holding Corp. 0.68%
- Tenet Healthcare Corporation 0.67%
- Reliance Inc. 0.65%
- XPO Inc. 0.63%
- Entegris Inc. 0.63%
- Roku Inc. Class A 0.62%
Only in VOO
503 total- NVIDIA Corp 7.51%
- Apple Inc 6.59%
- Microsoft Corp 4.30%
- 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 1.84%
Related comparisons
More comparisons with MDY
- MDY vs IVV · iShares Core S&P 500 ETF 0.1%
- MDY vs VUG · Vanguard Morningstar Growth ETF 0.0%
- MDY vs SPY · State Street SPDR S&P 500 ETF Trust 0.0%
- MDY vs QQQ · Invesco QQQ Trust 0.0%
- MDY vs IVOO · Vanguard S&P Mid-Cap 400 Index Fund ETF Shares 91.4%
- MDY vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 81.5%
More comparisons with VOO
- VOO vs AVUV · Avantis US Small Cap Value ETF 0.0%
- VOO vs IJR · iShares Core S&P Small-Cap ETF 0.0%
- VOO vs IJS · iShares S&P Small-Cap 600 Value ETF 0.0%
- VOO vs SPSM · State Street SPDR Portfolio S&P 600 Small Cap ETF 0.0%
- VOO vs VIOO · Vanguard S&P Small-Cap 600 Index Fund ETF Shares 0.0%
- VOO vs VIOV · Vanguard S&P Small-Cap 600 Value Index Fund ETF Shares 0.0%
Percentages are holdings overlap with the named fund.
Open MDY or VOO 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.