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S and P 500

The S&P 500 is an index of 500 large cap companies maintained by Standard and Poor's.

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Expanded Definition

Many index funds mimic the S&P 500, as does the spiders (AMEX:SPY) exchange-traded fund. Standard and Poor's introduced the index we now know as the S&P 500 in 1923. At the time it covered 233 companies. This index was expanded by Standard and Poor's in 1957 to 500 companies.

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