ETF comparison
IVOOvsMDY
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
387 positions appear in both funds. Buying equal dollars of IVOO and MDY would leave roughly88.6%of each dollar exposed to the same underlying securities.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — seewhat we don't scorefor 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 thecost calculator pre-filled with IVOO vs MDY.
Top shared holdings
387 shared in total| # | Holding | In IVOO | In MDY | Overlap |
|---|---|---|---|---|
| 1 | Twilio Inc | 0.82% | 1.01% | 0.82% |
| 2 | TechnipFMC PLC | 0.79% | 0.88% | 0.79% |
| 3 | Everpure Inc | 0.71% | 0.86% | 0.71% |
| 4 | Illumina Inc | 0.71% | 0.93% | 0.71% |
| 5 | nVent Electric PLC | 0.77% | 0.68% | 0.68% |
| 6 | ATI Inc | 0.68% | 0.77% | 0.68% |
| 7 | Carpenter Technology Corp | 0.67% | 0.64% | 0.64% |
| 8 | XPO Inc | 0.72% | 0.60% | 0.60% |
| 9 | Okta Inc | 0.60% | 0.79% | 0.60% |
| 10 | Curtiss-Wright Corp | 0.79% | 0.58% | 0.58% |
| 11 | United Therapeutics Corp | 0.68% | 0.58% | 0.58% |
| 12 | Woodward Inc | 0.59% | 0.57% | 0.57% |
Only in IVOO
13 total- Flex Ltd1.58%
- Webster Financial Corp0.33%
- TopBuild Corp0.33%
- Chart Industries Inc0.27%
- Masimo Corp0.23%
- Janus Henderson Group PLC0.18%
- Taylor Morrison Home Corp0.16%
- National Storage Affiliates Trust0.09%
- Goodyear Tire & Rubber Co/The0.05%
- Concentrix Corp0.04%
Only in MDY
14 total- U.S. Dollar0.77%
- Coeur Mining Inc.0.62%
- Roku Inc. Class A0.58%
- Toast Inc. Class A0.44%
- Sun Communities Inc.0.38%
- Semtech Corporation0.35%
- Allison Transmission Holdings Inc.0.30%
- Molina Healthcare Inc.0.29%
- Sanmina Corporation0.29%
- Krystal Biotech Inc.0.27%
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 methodologyand 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.