The S&P 500 is an important stock market index in the United States. Established in 1954 by Standard & Poor’s, a credit rating agency, the value of the index is based on the market capitalisation of 500 of the largest publicly-traded US companies, chosen to reflect the range of US business activity. Criteria for selection also include a minimum market value of $4 billion, with at least 50% of the shares in public hands, and a market price of at least $1 per share.
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