The S&P 500 is a stock market index maintained by S&P Dow Jones Indices. It comprises 503 common stocks which are issued by 500 large-cap companies traded on the American stock exchanges (including the 30 companies that compose the Dow Jones Industrial Average). The index includes about 80 percent of the American market by capitalization. It is weighted by free-float market capitalization, so more valuable companies account for relatively more weight in the index. The index constituents and the constituent weights are updated regularly using rules published by S&P Dow Jones Indices. Although called the S&P 500, the index contains 503 stocks because it includes two share classes of stock from three of its component companies (Alphabet, Fox Corporation and News Corp).[1][2]
S&P 500 component stocks
Selected changes to the list of S&P 500 components
S&P Dow Jones Indices updates the components of the S&P 500 periodically, typically in response to acquisitions, or to keep the index up to date as various companies grow or shrink in value.[5] Between January 1, 1963, and December 31, 2014, 1,186 index components were replaced by other components.
See also
External links
References
- The S&P 500 is becoming the S&P 502. USA Today, 2014-07-30, retrieved 2014-12-02^
- S&P U.S. Indices Methodology Update www.spice-indices.com, 2015-01-12, retrieved 2015-03-13^
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