About a year ago I showed a table on the blog that broke down op-ex week by month. Op-ex week in general is normally pretty bullish. March, April, and December it has been especially so. S&P 500 options began trading in mid-1983. The table below is an updated version of the one I produced last year. It goes back to 1984. I excluded op-ex week of September 2001 due to the extreme (and horrific) circumstances.

While December has been more reliable, total gains have been the largest during March op-ex.