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How is the value of the S&P 500 calculated? The S&P 500 is a U.S.market index that gives investors an idea of the overall movement in the U.S.equity market. The value of the S&P 500 constantly changes based on the movement of 500 underlying stocks. The index is computed by weighted average market capitalization.
This helps correct for the fact that averages tend to be affected by extreme values. Most indices weight for market capitalization. A prominent example is the S&P 500. See also: Weighted average price.