ETF comparison
IJK vs MDY
Both US Mid Cap.
iShares S&P Mid-Cap 400 Growth ETF · State Street SPDR S&P MIDCAP 400 ETF Trust
Holdings overlap
226 positions appear in both funds. Buying equal dollars of IJK and MDY would leave roughly 58.0% 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
IJK is 7 bps cheaper than MDY. On a $100,000 position that's about $70/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 IJK vs MDY.
Top shared holdings
226 shared in total| # | Holding | In IJK | In MDY | Overlap |
|---|---|---|---|---|
| 1 | Twilio, Inc. | 1.66% | 1.30% | 1.30% |
| 2 | Okta, Inc. | 1.21% | 1.01% | 1.01% |
| 3 | ATI, Inc. | 1.42% | 0.75% | 0.75% |
| 4 | United Therapeutics Corp. | 1.22% | 0.67% | 0.67% |
| 5 | MACOM Technology Solutions Holdings, Inc. | 1.32% | 0.64% | 0.64% |
| 6 | XPO, Inc. | 1.28% | 0.62% | 0.62% |
| 7 | Tenet Healthcare Corp. | 0.85% | 0.60% | 0.60% |
| 8 | Entegris, Inc. | 0.58% | 0.73% | 0.58% |
| 9 | Curtiss-Wright Corp. | 1.48% | 0.58% | 0.58% |
| 10 | Roku, Inc. | 0.96% | 0.58% | 0.58% |
| 11 | Royal Gold, Inc. | 0.86% | 0.57% | 0.57% |
| 12 | Woodward, Inc. | 1.34% | 0.56% | 0.56% |
Only in IJK
17 total- nVent Electric plc 1.45%
- TechnipFMC plc 1.40%
- Everpure, Inc. 1.32%
- Fabrinet 1.07%
- Jazz Pharmaceuticals plc 0.80%
- Illumina, Inc. 0.76%
- TopBuild Corp. 0.53%
- Chart Industries, Inc. 0.50%
- Roivant Sciences Ltd. 0.49%
- RenaissanceRe Holdings Ltd. 0.37%
Only in MDY
175 total- U.S. Dollar 0.89%
- nVent Electric plc 0.79%
- TechnipFMC plc 0.77%
- TD SYNNEX Corporation 0.64%
- US Foods Holding Corp. 0.60%
- Reliance Inc. 0.59%
- Roivant Sciences Ltd. 0.55%
- WESCO International Inc. 0.53%
- Permian Resources Corporation Class A 0.53%
- HF Sinclair Corporation 0.50%
Related comparisons
More comparisons with IJK
- IJK vs BBMC · JPMorgan BetaBuilders U.S. Mid Cap Equity ETF 38.3%
- IJK vs SCHM · Schwab U.S. Mid-Cap ETF 36.3%
- IJK vs VB · Vanguard Morningstar Small-Cap ETF 29.4%
- IJK vs IJJ · iShares S&P Mid-Cap 400 Value ETF 28.0%
- IJK vs IWP · iShares Russell Mid-Cap Growth ETF 19.0%
- IJK vs AVMV · Avantis U.S. Mid Cap Value ETF 16.0%
More comparisons with MDY
- 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%
- 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%
Percentages are holdings overlap with the named fund.
Open IJK 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.