S&P 500 (^SPX) – abbreviation of the Standard and Poor's 500-is a US stock market index based on the total market value of 500 large companies that have ordinary shares listed on the New York Stock Exchange or NASDAQ. The headquarters is located in New York. Since 1860, Standard and Poor's has offices in 23 countries and supports the S & amp; P 500 index. The Standard and Poor's index portfolio, which makes up the S & amp; P 500 index, has an asset of more than 1.25 trillion USD. The S & amp; P 500 index displays the status of the entire stock market, tracking the earnings and volatility of the 500 most frequently traded shares of leading companies on the NYSE, which cover about 80% of the total market value of all companies. Among the 500 companies that make up the S&P 500, there are companies from all major industries, and they are selected based on their market capitalization, liquidity, ability to sell, as well as other factors. In addition, the importance of the S&P 500 index is emphasized in its use as an economic indicator of the state of the United States economy.