Business and Personal Finance Dictionary

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• STANDARD AND POOR’S 500 - $SPX
  
  The S&P 500 index - ($SPX), more formally known as the S&P 500 Composite Stock Price Index, is a European-style, capitalization-weighted index (shares outstanding multiplied by stock price) of 500 stocks that are traded on the New York Stock Exchange, American Stock Exchange and NASDAQ National Market. The advantage of "cap-weighting" is that each company's influence on index performance is directly proportional to its relative market value. It is this characteristic that makes the S&P 500 such a valuable tool for measuring the performance of actual portfolios.
  
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