The S&P MidCap 400 Index measures the performance of Mid Cap securities and is selected by a Committee process. Currently, 10 ETFs track the S&P MidCap 400 Index with more than $68.17 B in ETP assets with an average expense ratio of 0.74%. The largest ETF is iShares Core S&P Mid-Cap ETF (IJH) by iShares with $45.61 B in assets.
In the last 12 months, the best performing S&P MidCap 400 Index ETF was the ProShares UltraPro MidCap400 (UMDD) at 59.50%. The most-recent ETF launched by S&P MidCap 400 Index was the Vanguard S&P Mid-Cap 400 ETF (IVOO) in September 2010.