The S&P 500 Index

The S&P 500 Index is a stock market index that tracks the performance of approximately 500 of the largest publicly traded companies in the United States.

It is maintained by S&P Dow Jones Indices, a subsidiary of S&P Global.

S&P 500 component stocks

Key characteristics of the S&P 500 include:

• Market Capitalization Weighting: The index is weighted by free-float market capitalization, meaning that companies with larger market values have a greater impact on the index’s performance.
• Broad Representation: It is considered a leading indicator of the overall health of the U.S. stock market and the broader economy, representing about 80% of the total U.S. equity market value.
• Diverse Industries: The index includes companies from a wide range of industries, ensuring broad diversification.
• Selection Criteria: Companies are selected for inclusion by a committee based on strict criteria, including market capitalization, liquidity, and domicile.
• Benchmark for Investments: The S&P 500 is widely used as a benchmark for investment funds, such as index mutual funds and exchange-traded funds (ETFs), that aim to replicate its performance.

It’s important to note that you cannot invest directly in the S&P 500 index itself. Instead, investors can gain exposure to it by investing in funds that track the index.

As of September 12, 2025, the S&P 500 Index closed at 6,584.00.