Over the past 23 years, since 1999, S&P 500’s performance during January’s option expiration week has been a mixed bag. Friday has been up 12 and down 11, and the entire week has been down 14 times with an average weekly loss of 0.50%. DJIA’s record on Friday and the week after is similar to S&P 500. DJIA has performed modestly better during expiration week with 12 advances, but its average loss is larger at 0.65%. NASDAQ holds no observable advantage over S&P 500 and DJIA with mild average losses on Friday, during the full week and the week after.