Live S&P 500 index level and historical performance.
The S&P 500 tracks 500 of the largest US publicly traded companies, weighted by market capitalization, and is the most widely cited benchmark for the overall US stock market. Money managers use it to measure whether a portfolio is beating "the market"; the Fed and economists watch it as a read on investor sentiment and wealth effects. This page updates the index level continuously during market hours alongside its daily percent change and year-to-date return.