The Nasdaq Composite was formed in 1971 and includes the stocks of more than 3,000 companies today. It includes stocks that are listed on the technology-company-heavy Nasdaq stock exchange, one of the market's largest exchanges. (Other major stock exchanges include the New York Stock Exchange, or the NYSE, and the American Stock Exchange, or AMEX.) Like the S&P 500, the Nasdaq is a market-cap-weighted index. For a stock to be included in the Nasdaq Composite, it must trade on the Nasdaq stock exchange and meet other specific criteria. If a company fails to meet all of the criteria at any time, it is then removed from the composite.
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