ETF comparison
IJJ vs MDY
Both US Mid Cap.
iShares S&P Mid-Cap 400 Value ETF · State Street SPDR S&P MIDCAP 400 ETF Trust
Holdings overlap
282 positions appear in both funds. Buying equal dollars of IJJ and MDY would leave roughly 57.1% 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
IJJ is 5 bps cheaper than MDY. On a $100,000 position that's about $50/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 IJJ vs MDY.
Top shared holdings
282 shared in total| # | Holding | In IJJ | In MDY | Overlap |
|---|---|---|---|---|
| 1 | Entegris, Inc. | 0.95% | 0.73% | 0.73% |
| 2 | TD SYNNEX Corp. | 1.15% | 0.64% | 0.64% |
| 3 | US Foods Holding Corp. | 1.29% | 0.60% | 0.60% |
| 4 | Reliance, Inc. | 1.10% | 0.59% | 0.59% |
| 5 | WESCO International, Inc. | 0.97% | 0.53% | 0.53% |
| 6 | Permian Resources Corp. | 0.83% | 0.53% | 0.53% |
| 7 | HF Sinclair Corp. | 0.61% | 0.50% | 0.50% |
| 8 | MKS, Inc. | 0.50% | 0.54% | 0.50% |
| 9 | East West Bancorp, Inc. | 0.50% | 0.50% | 0.50% |
| 10 | Lattice Semiconductor Corp. | 0.49% | 0.55% | 0.49% |
| 11 | Ovintiv, Inc. | 0.83% | 0.48% | 0.48% |
| 12 | Reinsurance Group of America, Inc. | 0.80% | 0.47% | 0.47% |
Only in IJJ
17 total- Webster Financial Corp. 0.71%
- Illumina, Inc. 0.70%
- SharkNinja, Inc. 0.62%
- CNH Industrial NV 0.57%
- Axalta Coating Systems Ltd. 0.42%
- Sensata Technologies Holding plc 0.40%
- Taylor Morrison Home Corp. 0.38%
- Roivant Sciences Ltd. 0.38%
- RenaissanceRe Holdings Ltd. 0.37%
- Janus Henderson Group plc 0.37%
Only in MDY
119 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%
- United Therapeutics Corporation 0.67%
- MACOM Technology Solutions Holdings Inc. 0.64%
- XPO Inc. 0.62%
- Tenet Healthcare Corporation 0.60%
Related comparisons
More comparisons with IJJ
- IJJ vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 37.6%
- IJJ vs SCHM · Schwab U.S. Mid-Cap ETF 35.4%
- IJJ vs VB · Vanguard Morningstar Small-Cap ETF 28.5%
- IJJ vs IJK · iShares S&P Mid-Cap 400 Growth ETF 28.0%
- IJJ vs IWS · iShares Russell Mid-Cap Value ETF 18.2%
- IJJ vs AVMV · Avantis U.S. Mid Cap Value ETF 17.7%
More comparisons with MDY
- MDY vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 55.8%
- MDY vs SCHM · Schwab U.S. Mid-Cap ETF 51.1%
- MDY vs VB · Vanguard Morningstar Small-Cap ETF 43.6%
- MDY vs AVMV · Avantis U.S. Mid Cap Value ETF 24.2%
- MDY vs IWS · iShares Russell Mid-Cap Value ETF 22.6%
- MDY vs IWR · iShares Russell Mid-Cap ETF 21.7%
Percentages are holdings overlap with the named fund.
Open IJJ 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.