P/E data based on as-reported earnings; estimate data based on operating earnings. Sources: Birinyi Associates We are in the process of updating our Market Data experience and we want to hear from S&P 500 PE Ratio chart, historic, and current data. Current S&P 500 PE Ratio is 20.38, a change of +1.71 from previous market close. A mistake many investors make is associating value investing with only buying stocks with a low price-to-earnings (P/E) ratio. While a high P/E ratio has generated above-average returns over long periods in the past, it is not always the ideal method to use for valuation.