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
285 positions appear in both funds. Buying equal dollars of IJJ and MDY would leave roughly 58.0% of each dollar exposed to the same underlying securities.
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
285 shared in total| # | Holding | In IJJ | In MDY | Overlap |
|---|---|---|---|---|
| 1 | US Foods Holding Corp. | 1.30% | 0.64% | 0.64% |
| 2 | Entegris, Inc. | 0.68% | 0.62% | 0.62% |
| 3 | Illumina, Inc. | 0.55% | 0.79% | 0.55% |
| 4 | Reliance, Inc. | 1.01% | 0.53% | 0.53% |
| 5 | TD SYNNEX Corp. | 0.81% | 0.51% | 0.51% |
| 6 | Burlington Stores, Inc. | 0.50% | 0.54% | 0.50% |
| 7 | Performance Food Group Co. | 0.86% | 0.49% | 0.49% |
| 8 | East West Bancorp, Inc. | 0.46% | 0.49% | 0.46% |
| 9 | Annaly Capital Management, Inc. | 0.97% | 0.46% | 0.46% |
| 10 | WP Carey, Inc. | 0.45% | 0.44% | 0.44% |
| 11 | Dick's Sporting Goods, Inc. | 0.50% | 0.43% | 0.43% |
| 12 | Jones Lang LaSalle, Inc. | 0.91% | 0.42% | 0.42% |
Only in IJJ
18 total- BlackRock Funds III 3.36%
- BlackRock Funds III 0.66%
- CNH Industrial NV 0.62%
- Janus Henderson Group plc 0.40%
- RenaissanceRe Holdings Ltd. 0.39%
- Axalta Coating Systems Ltd. 0.38%
- Roivant Sciences Ltd. 0.33%
- Sensata Technologies Holding plc 0.33%
- Weatherford International plc 0.25%
- Masimo Corp. 0.22%
Only in MDY
116 total- Twilio Inc. Class A 0.88%
- U.S. Dollar 0.84%
- Carpenter Technology Corporation 0.82%
- Curtiss-Wright Corporation 0.78%
- TechnipFMC plc 0.74%
- ATI Inc 0.71%
- Woodward Inc. 0.69%
- nVent Electric plc 0.68%
- XPO Inc. 0.67%
- Okta Inc. Class A 0.66%
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.