Monthly S&P 500 index performance 2017-2020

The S&P 500, an index of 500 publicly traded companies in the United States, closed at 3500.31 points on the last day of August 2020.

What is the S&P 500?

The S&P 500 is a stock market index that tracks the evolution of 500 companies. In contrast to the Dow Jones Industrial Index, which measures the performance of thirty large U.S. companies, the S&P 500 shows the sentiments in the broader market.

Publicly traded companies

Companies on the S&P 500 are publicly traded, meaning that anyone can invest in them. A large share of adults in the United States invest in the stock market, though many of these are through a retirement account or mutual fund. While most people make a modest return, the most successful investors have made billions of U.S. dollars through investing.

Monthly development of the S&P 500 index from October 2017 to August 2020

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Release date

September 2020


United States

Survey time period

October 2017 to August 2020

Special properties

end of month closing values

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