S&P 500 

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Latest news on the S&P 500, or the Standard & Poor's 500, an American stock market index based on the market capitalizations of 500 large companies having common stock listed on the NYSE or NASDAQ. The S&P 500 index components and their weightings are determined by S&P Dow Jones Indices. It is one of the most commonly followed equity indices, and many consider it to be one of the best representations of the U.S. stock market. The index includes 500 of the top companies in leading industries of the U.S. economy, including health care, technology, consumer goods, and more.