This company has continued to grow while navigating a changing landscape.The S&P 500 (^GSPC 0.40%) is generally recognized as the most comprehensive measure of the U.S. stock market, made up of the 500 leading publicly traded companies in the country. Given the broad reach of the businesses that make up the index, it is regarded as the most reliable benchmark of overall stock market performance.To be considered for admission to the S&P 500, a company must meet the following criteria:Be a U.S. companyIts mar ...