S&P Dow Jones Indices is a leading provider of financial market indices, which are used to measure the performance of various asset classes, including stocks and bonds. It is a joint venture between S&P Global, CME Group, and News Corp. The indices are widely recognized and serve as benchmarks for investment performance, helping investors make informed decisions. The most well-known index managed by S&P Dow Jones Indices is the S&P 500, which tracks the performance of 500 large companies listed on stock exchanges in the United States. Other notable indices include the Dow Jones Industrial Average and the S&P MidCap 400, each serving different segments of the market.