The S&P 500, or the Standard & Poor's 500, is a stock market index based on the market capitalizations of 500 leading companies publicly traded in the U.S. stock market, as determined by Standard & Poor's. It differs from other U.S. stock market indices such as the Dow Jones Industrial Average and the Nasdaq due to its diverse constituency and weighting methodology. It is one of the most commonly followed equity indices and many consider it the best representation of the market as well as abellwether for the U.S. economy.[4] The National Bureau of Economic Research has classified common stocks as a leading indicator of business cycles.[5]
The S&P 500 is maintained by Standard & Poor's, a division of McGraw-Hill that publishes a variety of other stock market indices such as the S&P MidCap 400, the S&P SmallCap 600 and the S&P Composite 1500. It is a free-float capitalization-weightedindex[3] and has several ticker symbols: ^GSPC,[6] INX,[7] and $SPX.[8]
| S&P 500/stocks | |
|---|---|
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| S&P 500 Index from 1950 to 2012 | |
| Foundation | 1957[1] |
| Operator | Standard & Poor's[2] |
| Exchanges | NYSE, NASDAQ |
| Constituents | 500[2] |
| Type | Large-cap[2] |
| Market cap | US$ 14,199 billion (as of April 30, 2013)[1] |
| Weighting method | Free-float capitalization-weighted[3] |
| Related indices | |
| Website | S&P 500 |
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