What Is the S&P 500?
The S&P 500 is the most widely followed stock market index in the world. It has returned roughly 10% annually since inception, including dividends.
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The S&P 500 is an index tracking the 500 largest US public companies, weighted by market capitalization. It is the default benchmark for US stock market performance and the basis for the most popular index funds.
Real-world example: When news says "the market was up 1%," they almost always mean the S&P 500. It represents about 80% of total US stock market value.
Explore more terms in our comprehensive Financial Glossary with 140+ terms explained in plain English.
Frequently Asked Questions
Why is understanding the S&P 500 important for investors?
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Knowing what the S&P 500 means helps you make better financial decisions, read investment news with confidence, and avoid common mistakes. Financial literacy is the foundation of successful investing — understanding concepts like the S&P 500 puts you ahead of most individual investors.
How does the S&P 500 relate to everyday personal finance?
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the S&P 500 isn't just Wall Street jargon — it directly impacts how your money grows (or doesn't). Whether you're managing a 401(k), evaluating a savings account, or considering an investment, understanding the S&P 500 helps you make choices that align with your financial goals.
Where can I learn more about markets concepts?
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Our Financial Glossary covers 140+ terms across investing, retirement, taxes, credit, crypto, and budgeting — all explained in plain English with real-world examples. You can also use our calculators to see these concepts in action with your own numbers.