Generated October 17, 2026.
Overview
IJH and MDY are both ETFs that track the S&P MidCap 400 Index, giving them nearly identical underlying exposure to 400 mid-sized U.S. companies. The key distinction lies in their cost structure and asset base: IJH charges 0.05% versus 0.23% for MDY, and IJH holds $121B in assets compared to $25.7B for MDY.
How they differ
Both ETFs replicate the same index, so their performance before fees should track almost identically. Over time, that compounds into meaningful drag on returns for MDY shareholders.
The second difference is scale. IJH has built a substantially larger asset base at $121B, versus $25.7B for MDY. Larger funds typically enjoy tighter bid-ask spreads and lower trading friction, though spreads depend on intraday volume and market conditions.
Distribution yield is also slightly higher for IJH at 1.25% versus 0.97% for MDY, a gap of 0.28%. Both pay quarterly dividends from the same underlying holdings, so the modest spread likely reflects timing differences in distributions or minor fee drag on MDY's yield.
Both have published betas of 1.0, confirming they move in line with the broad mid-cap market. IJH inception was May 2000; MDY began earlier, in May 1995.
Who each is best for
IJH: Fits investors seeking broad mid-cap exposure at the lowest possible cost, particularly those building core equity positions where fee drag compounds over decades.
Key risks to know
- Index concentration within mid-cap range. Both ETFs hold 400 stocks, but the S&P MidCap 400 is itself a slice of the U.S. equity market. Concentration in mid-cap stocks exposes you to sector and size-related drawdowns that large-cap or small-cap indices may avoid.
- Tracking error from dividends and rebalancing. Because both funds must periodically rebalance the index and handle dividend reinvestment timing, actual returns may lag the index slightly. MDY's higher expense ratio amplifies this effect relative to IJH.
Bottom line
If you prioritize minimizing costs on a core mid-cap holding, IJH's lower fee and larger asset base make it the more efficient vehicle. If you have a tactical or secondary reason to hold MDY — platform integration, existing share position — the 0.28% yield difference and 0.18% fee gap aren't insurmountable, but they work in IJH's favor on pure economics. Past performance doesn't predict future results.
AI-generated analysis for educational purposes only. Verify important details independently; past performance does not guarantee future results.
