When it was first officially established on 3 March 1957, the S&P 500 (Index: SPX) had a total market capitalization of $172 billion. Over twenty five years later, at the end of 1982, the market capitalization of the entire S&P 500 had grown to more than $1 trillion.
Now, nearly 36 years later, at least two of the 505 companies that currently compose the index have market caps that have reached values of $1 trillion or more: Apple Computer (Nasdaq: AAPL) and Amazon (Nasdaq: AMZN), neither of which existed in 1957 and only one of which existed in 1982.
Overall, the market capitalization of the entire S&P 500 stands at roughly $25.8 trillion through the end of August 2018. The following chart tracks the history of the index' market valuation since it reached $1 trillion in value. We also have a chart showing the vertical axis on a logarithmic scale if you would prefer to see that version!
A third company, most popularly known as Google but officially called Alphabet (Nasdaq: Amazon (Nasdaq: GOOG and GOOGL), which also did not exist in either 1957 or in 1982, could also reach that lofty market valuation during 2018.
Now, nearly 36 years later, at least two of the 505 companies that currently compose the index have market caps that have reached values of $1 trillion or more: Apple Computer (Nasdaq: AAPL) and Amazon (Nasdaq: AMZN), neither of which existed in 1957 and only one of which existed in 1982.
Overall, the market capitalization of the entire S&P 500 stands at roughly $25.8 trillion through the end of August 2018. The following chart tracks the history of the index' market valuation since it reached $1 trillion in value. We also have a chart showing the vertical axis on a logarithmic scale if you would prefer to see that version!
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