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
383 positions appear in both funds. Buying equal dollars of IVOO and MDY would leave roughly 87.1% 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
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
383 shared in total| # | Holding | In IVOO | In MDY | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc | 0.82% | 1.30% | 0.82% |
| 2 | TechnipFMC PLC | 0.79% | 0.77% | 0.77% |
| 3 | nVent Electric PLC | 0.77% | 0.79% | 0.77% |
| 4 | ATI Inc | 0.68% | 0.75% | 0.68% |
| 5 | United Therapeutics Corp | 0.68% | 0.67% | 0.67% |
| 6 | MACOM Technology Solutions Holdings Inc | 0.67% | 0.64% | 0.64% |
| 7 | XPO Inc | 0.72% | 0.62% | 0.62% |
| 8 | Entegris Inc | 0.60% | 0.73% | 0.60% |
| 9 | Okta Inc | 0.60% | 1.01% | 0.60% |
| 10 | Curtiss-Wright Corp | 0.79% | 0.58% | 0.58% |
| 11 | Reliance Inc | 0.57% | 0.59% | 0.57% |
| 12 | Woodward Inc | 0.59% | 0.56% | 0.56% |
Only in IVOO
17 total- Flex Ltd 1.58%
- Everpure Inc 0.71%
- Illumina Inc 0.71%
- Webster Financial Corp 0.33%
- TopBuild Corp 0.33%
- Chart Industries Inc 0.27%
- Masimo Corp 0.23%
- Janus Henderson Group PLC 0.18%
- Taylor Morrison Home Corp 0.16%
- National Storage Affiliates Trust 0.09%
Only in MDY
18 total- U.S. Dollar 0.89%
- Roku Inc. Class A 0.58%
- Coeur Mining Inc. 0.52%
- Semtech Corporation 0.52%
- Toast Inc. Class A 0.44%
- Sun Communities Inc. 0.39%
- Sanmina Corporation 0.35%
- Viavi Solutions Inc 0.33%
- Corcept Therapeutics Incorporated. 0.32%
- HubSpot Inc. 0.31%
Related comparisons
More comparisons with IVOO
- IVOO vs IJK · iShares S&P Mid-Cap 400 Growth ETF 63.3%
- IVOO vs IJJ · iShares S&P Mid-Cap 400 Value ETF 61.6%
- IVOO vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 56.7%
- IVOO vs SCHM · Schwab U.S. Mid-Cap ETF 54.6%
- IVOO vs VB · Vanguard Morningstar Small-Cap ETF 43.0%
- IVOO vs AVMV · Avantis U.S. Mid Cap Value ETF 26.3%
More comparisons with MDY
- 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%
- 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%
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.