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S&P 500
Large-cap American stock market index
S&P 500
The S&P 500 (Standard and Poor's 500) is a stock market index tracking the stock performance of 500 companies listed on stock exchanges in the United States that are considered to have large market capitalizations. The S&P 500 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 83% of the total market capitalization of U.S. public companies, with an aggregate market capitalization of more than $61.1 trillion as of December 31, 2025. The median market capitalization of the components of the index is $41.8 billion and components range in market capitalization from $5.6 billion to $4.8 trillion. Products linked to the S&P 500 include index funds (exchange-traded funds/ETFs and mutual funds) as well as derivatives (options and futures contracts...
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