History of S&P 500 in Timeline

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S&P 500

The S&P 500 is a stock market index that tracks the performance of 500 of the largest publicly traded companies in the United States. It represents roughly 80% of the total U.S. equity market capitalization, making it a key indicator of overall market health and economic performance. As of the end of 2025, the S&P 500 had an aggregate market capitalization exceeding $61.1 trillion. It serves as a benchmark for investment portfolios and is widely used by investors and financial professionals.