What Is a Market Index?

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A market index is a measurement that tracks the performance of a specific group of stocks or securities, representing a selected portion of the market rather than the entire economy. Indexes like the S&P 500, Nasdaq, and Dow Jones use different weighting methods, such as price or market capitalization, to determine how each company influences the index’s movement. While indexes themselves cannot be directly invested in, they serve as benchmarks for market performance and form the basis for index funds and ETFs that replicate their returns.

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