The S&P 1500, or S&P Composite 1500 Index, is a stock market index of US stocks published by S&P Global. It combines stocks in the S&P 500, S&P MidCap 400, and S&P SmallCap 600. This index covers approximately 90% of the market capitalization of U.S. stocks and is a broad measure of the U.S. equity market. The index was launched on May 18, 1995, with a first value date of December 30, 1994. Wikipedia