S&P 500 Index
Market index
The S&P 500, or just the S&P, is a stock market index that measures the stock performance of 500 large companies listed on stock exchanges in the United States. It is one of the most commonly followed equity indices, and many consider it to be one of the best representations of the U.S. stock market. Wikipedia
Market cap: US$28.1 trillion; (as of December 31, 2019)
Exchanges: NYSE, NASDAQ, Cboe BZX Exchange
Weighting method: Free-float capitalization-weighted
Related indices: List: S&P 1500; S&P Global 1200; S&P 100
Constituents: 505
Foundation: March 4, 1957; 62 years ago