The S&P 500 is one of the most widely followed stock market indexes in the world. It appears in financial headlines, fund descriptions, retirement plan menus, market commentary, and economic analysis. Yet many readers still use the term loosely, often treating it as a shortcut for “the stock market” without understanding what the index actually measures.
At its core, the S&P 500 is a benchmark for large publicly traded U.S. companies. It does not include every stock, every sector equally, or every part of the global economy. It is a specific index built according to specific rules, and those rules shape how it behaves.
This guide explains what the S&P 500 tracks, how companies are selected, why market-cap weighting matters, how S&P 500 ETFs and index funds work, and what risks readers should understand before treating the index as a complete market solution.
Key Takeaways
Point
Details
The S&P 500 tracks large U.S. companies
It is commonly used as a
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