There are 500 large-cap U.S. stocks in the S&P 500. The index covers a broad range of sectors, including consumer staples, financials, technology and health care. Many of the companies you interact with on an everyday basis are in the S&P 500, like Home Depot, Exxon Mobil, Mastercard and Coca-Cola. Some companies have more than one type of stock offered and included in the index, which is why you may see the designations "Class A" and "Class B."