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

The S&P 500 index is a free-float weighted/capitalization-weighted index. As of September 30, 2024, the nine largest companies on the list of S&P 500 companies accounted for 34.6% of …

Find the latest S&P 500 (^GSPC) stock quote, history, news and other vital information to help you with your stock trading and investing.

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

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 …