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04/03/1957 The S&P 500 stock market index is introduced

The Standard & Poor's 500 is an American stock market index based on the market capitalizations of 500 large companies having common stock listed on the NYSE or NASDAQ. The "Composite Index", as the S&P 500 was first called when it introduced its first stock index in 1923, began tracking a small number of stocks, and by 1957 it had its current 500.