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S&P 400
American mid-cap stock market index
S&P 400
The S&P 400 (S&P MidCap 400 or Standard and Poor's 400) is a stock market index tracking the stock performance of 400 companies listed on stock exchanges in the United States that are considered to have medium market capitalizations. The S&P 400 is a subset of the S&P 1500. It is maintained by S&P Dow Jones Indices and its components are selected by a committee. For a list of the criteria for addition to the index, see S&P 1500 § Selection criteria. The index is a public-float-weighted/capitalization-weighted index. The index includes approximately 5% of the total market capitalization of U.S. public companies, with an aggregate market capitalization of more than $2.9 trillion as of December 31, 2025. The median market capitalization of the components of the index is $7.9 billion and components range in market capitalization from $1.5 billion to $33.6 billion. Products linked to the S&P 400 include index funds (exchange-traded funds/ETFs and mutual funds) as well as derivatives (options...
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