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Current S&P 500 PE Ratio: 28.40 -0.04 (-0.16%)
4:00 PM EDT, Fri Jun 21
Mean: 16.07
Median: 15.00
Min: 5.31 (Dec 1917)
Max: 123.73 (May 2009)

Price to earnings ratio, based on trailing twelve month “as reported” earnings.

Current PE is estimated from latest reported earnings and current market price.

Source: Robert Shiller and his book Irrational Exuberance for historic S&P 500 PE Ratio.