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When was the S&P 500 founded?

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The S&P 500 index, formerly called the Composite Index (and later Standard & Poor's Composite Index), had been launched on a small scale in 1923. It began tracking 90 stocks in 1926 and expanded to 500 in 1957. Unlike the Dow Jones average, the S&P 500 computes a weighted average of the stocks constituting the index.
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