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The Gain Per Trading Day And Day Of The Week Since 1970 in S&P 500

Do you know the average return in the S&P 500 separated into trading days and day of the week?

In this article, we look at the average gain per trading day and day of the week. The best days are centered around the first and last days of the month. We also find out that the best trading days are Tuesdays and Wednesdays, something which might explain the “Monday reversal”.

Let’s start by measuring the trading day of the month:

The average gain per trading day of the month

Below you can find a bar showing the average return per trading day in the S&P 500 since 1970, excluding dividends.

Day 1 is simply the first trading day, not necessarily the 1st day of the calendar month.

Obviously, the months have a different number of trading days. The numbers are not compressed or prolonged to adjust for that. Sometimes day 20 is the last trading day of the month, in another month it could be the 21st.








The average gain per day of week

Looking at weekdays we get this bar chart (1 is Mondays and the gain is from the close on Friday until the close on Monday):










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