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Closing milestones of the S&P 500 Index
This article is a summary of the closing milestones of the S&P 500 Index, a United States stock market index. Since opening at 16.66 on January 3, 1950, the S&P 500 has increased despite several periods of decline.
==History==
Standard & Poor's, initially known as the Standard Statistics Company, created its first stock market index in 1923. It consisted of 233 different stocks and was computed on a weekly basis. Three years later, it developed a 90 component composite price index that was computed on a daily basis; that was expanded over the years. On March 4, 1957, the Standard & Poor's 500 (.INX) (.SPX) was introduced.〔S&P 500〕
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