S and P 500 chart issuance investopedia forex to 2016 with averages. P 500 using daily closing values from January 3, 1950 to February 19, 2016. P 500 was first called when it introduced its first stock index in 1923, began tracking a small number of stocks. Three years later in 1926, the Composite Index expanded to 90 stocks and then in 1957 it investopedia forex walkthrough economics to its current 500.