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.

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

The Major Indices Page presents charts of the four major indices for your selected market (U.S. or Canada) for a quick visual on how each index has moved over the last week.

Realtime quotes for major US and global market indexes covering the Americas, Europe, Middle East, Africa, and Asia Pacific

S&P 500 Today: Get all information on the S&P 500 Index including historical chart, news and constituents.

Find the latest information on S&P 500 INDEX (^SPX) including data, charts, related news and more from Yahoo Finance

Get S&P 500 Index (SPX:INDEX) real-time stock quotes, news, price and financial information from CNBC.

SPX: S&P 500 Index - Stock Price, Quote and News - CNBC

Get S&P 500 Index live stock quotes as well as charts, technical analysis, components and more SPX index data.

U.S. Equity Index futures and options Gain capital-efficient exposure to the U.S. equity market with the CME Group suite of liquid and flexible U.S. Equity Index futures and options. Choose from benchmarks indices such as the S&P 500, Nasdaq-100, Dow Jones, Russell 2000 Indices and more.

"Why?" A question as old as humanity, and as relevant today as ever. Explore the history, meaning, and necessity of the question that drives discovery from toddlers to theoretical physicists.