S&P 500 Index

SPX is an abbreviation for the S&P 500 Index, which is a stock market index that tracks the performance of 500 large-cap U.S. companies across a range of industries. The S&P 500 Index is widely considered to be one of the best indicators of the overall health and performance of the U.S. stock market and the economy as a whole.

The companies that make up the S&P 500 Index are selected by the S&P Dow Jones Indices, which is a subsidiary of S&P Global, based on a number of factors such as market capitalization, liquidity, and sector representation. The index is market-cap weighted, which means that companies with a larger market capitalization have a greater impact on the index’s overall performance.

The S&P 500 Index is a benchmark index that is closely watched by investors, financial analysts, and policymakers. It is often used as a barometer of the health of the U.S. economy and as a benchmark against which investment performance can be measured.


The S&P 500 index consists of most but not all of the largest companies in the United States. The S&P market cap is 70 to 80% of the total US stock market capitalization.

As of 2023-03-08 Total S&P 500 Market Capitalization is $33.377 trillion

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