Generated August 29, 2026.
Overview
IJH and MDY are both ETFs tracking the S&P MidCap 400 Index, giving them nearly identical underlying exposure to 400 mid-cap U.S. stocks. Both distribute quarterly and carry betas near 1.0, making them functionally equivalent in terms of market sensitivity and income generation.
How they differ
The primary difference is expense ratio: IJH costs 0.05% versus MDY's 0.23%, a spread of 18 basis points that compounds over time. This fee advantage flows directly from IJH's substantially larger asset base ($124B versus $26.1B), which allows iShares to spread fixed costs across a much wider pool. Both funds offer nearly identical distribution rates (1.00% versus 0.98%) and quarterly payout frequency, so yield to the investor is functionally the same. MDY has a slightly longer track record, dating to May 1995 versus IJH's inception in May 2000, though both have decades of performance history. The funds' betas are nearly identical (IJH at 1.0, MDY at 0.99), confirming that market-tracking behavior is equivalent.
Who each is best for
IJH: Fits investors seeking the lowest-cost broad mid-cap index exposure and willing to benefit from the liquidity and cost efficiency that comes with a very large AUM pool. Index-focused allocators prioritizing fee drag reduction over time.
MDY: Fits investors who already hold State Street's broader ecosystem of SPDR products or prefer the issuer's custody and operational infrastructure. Those for whom issuer familiarity or trading venue preference slightly outweighs the higher annual cost.
Key risks to know
- Index concentration within mid caps. Both funds track the same 400 mid-cap stocks, so performance will be driven by mid-cap sector rotation and valuation cycles. A prolonged period of large-cap outperformance or small-cap underperformance could pressure returns for both equally. Over a 20-year horizon, this compounds meaningfully.
- Moderate systematic risk. Both funds carry betas around 1.0, meaning they will track broad equity market downturns without dampening. Investors seeking downside cushioning will not find it in either fund.
Bottom line
If cost minimization is central to your allocation strategy, IJH's $124B scale and 0.05% expense ratio delivers a clear fee advantage. Either way, 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.