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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.
S&P Index Funds. You can also buy an S&P 500 index fund, a pool of all the stocks in the index. The managers of index funds don't actively pick stocks but simply attempt to match the contents of the S&P 500 list.Many fund management companies, including Vanguard and Fidelity, list available S&P 500 index funds.PX is the stock market symbol for the S&P 500 stock index. ... How to Buy S&P 500 Stock. The S&P 500...