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Maintained and calculated by S&P Dow Jones Indices LLC, the index selects companies based on stringent criteria including market capitalization, liquidity, and sector representation, ensuring a diversified cross-section of the U.S. large-cap equity market. Since its inception in 1957, the S&P 500 has become the primary gauge by which institutional investors, financial professionals, and economists measure overall stock market performance and economic trends. The index's market-cap weighting methodology means that larger companies exert proportionally greater influence on the index's movements, making it particularly reflective of how the most valuable U.S. corporations are performing. The constituent companies span nearly every major economic sector, including technology, healthcare, financials, consumer goods, and energy, providing broad exposure to the U.S. business landscape. The S&P 500's widespread adoption as a performance benchmark has made it one of the most important financial indicators globally, influencing investment strategies, retirement planning, and economic policy discussions.50:T13bf,

SP 500 stock market news September 2026 SP 500 September 22 2026 stock market news

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