ETF comparison
IVOO vs MDY
Both US Mid Cap.
Vanguard S&P Mid-Cap 400 Index Fund ETF Shares · State Street SPDR S&P MIDCAP 400 ETF Trust
Holdings overlap
393 positions appear in both funds. Buying equal dollars of IVOO and MDY would leave roughly 91.4% 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
IVOO is 16 bps cheaper than MDY. On a $100,000 position that's about $160/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 IVOO vs MDY.
Top shared holdings
393 shared in total| # | Holding | In IVOO | In MDY | Overlap |
|---|---|---|---|---|
| 1 | TechnipFMC PLC | 0.87% | 0.72% | 0.72% |
| 2 | ATI Inc | 0.78% | 0.70% | 0.70% |
| 3 | US Foods Holding Corp | 0.65% | 0.68% | 0.65% |
| 4 | Tenet Healthcare Corp | 0.64% | 0.67% | 0.64% |
| 5 | XPO Inc | 0.64% | 0.63% | 0.63% |
| 6 | United Therapeutics Corp | 0.61% | 0.75% | 0.61% |
| 7 | Royal Gold Inc | 0.60% | 0.60% | 0.60% |
| 8 | Entegris Inc | 0.58% | 0.63% | 0.58% |
| 9 | Roku Inc | 0.58% | 0.62% | 0.58% |
| 10 | Woodward Inc | 0.57% | 0.55% | 0.55% |
| 11 | Reliance Inc | 0.55% | 0.65% | 0.55% |
| 12 | TD SYNNEX Corp | 0.53% | 0.53% | 0.53% |
Only in IVOO
7 total- Twilio Inc 1.00%
- Illumina Inc 0.91%
- Everpure Inc 0.82%
- Okta Inc 0.81%
- Olin Corp 0.06%
- Capri Holdings Ltd 0.04%
- Boston Beer Co Inc/The 0.04%
Only in MDY
8 total- U.S. Dollar 0.77%
- Glaukos Corp 0.41%
- HubSpot Inc. 0.31%
- AGNC Investment Corp. 0.30%
- Brinker International Inc. 0.27%
- Corteva Inc 0.23%
- Corcept Therapeutics Incorporated. 0.22%
- FormFactor Inc. 0.19%
Related comparisons
More comparisons with IVOO
- IVOO vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 90.8%
- IVOO vs IJH · iShares Core S&P Mid-Cap ETF 90.8%
- IVOO vs IJK · iShares S&P Mid-Cap 400 Growth ETF 62.7%
- IVOO vs IJJ · iShares S&P Mid-Cap 400 Value ETF 60.9%
- IVOO vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 58.6%
- IVOO vs SCHM · Schwab U.S. Mid-Cap ETF 54.2%
More comparisons with MDY
- MDY vs SPMD · State Street SPDR Portfolio S&P 400 Mid Cap ETF 81.5%
- MDY vs IJH · iShares Core S&P Mid-Cap ETF 81.4%
- MDY vs IJJ · iShares S&P Mid-Cap 400 Value ETF 58.9%
- MDY vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 54.8%
- MDY vs IJK · iShares S&P Mid-Cap 400 Growth ETF 54.4%
- MDY vs SCHM · Schwab U.S. Mid-Cap ETF 51.0%
Percentages are holdings overlap with the named fund.
Open IVOO or MDY 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.