2 days ago · SPX | A complete S&P 500 Index index overview by MarketWatch. View stock market news, stock market data and trading information.

Get the latest S&P 500 (.INX) value, historical performance, charts, and other financial information to help you make more informed trading and investment decisions.

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Apr 11, 2025 · S&P 500 Index advanced index charts by MarketWatch. View real-time SPX index data and compare to other exchanges and stocks.

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The S&P 500® is widely regarded as the best single gauge of large-cap U.S. equities. The index includes 500 leading companies and covers approximately 80% of available market capitalization.

4 days ago · View the full S&P 500 Index (SPX) index overview including the latest stock market news, data and trading information.

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It is one of the most commonly followed equity indices and includes approximately 80% of the total market capitalization of U.S. public companies, with an aggregate market cap of more than $49.8 trillion as of March 31, 2025. [2] The S&P 500 index is a Free-float weighted/ capitalization-weighted index.