Monday of September options expiration week is bullish for DJIA and S&P 500 although major shellacking’s in 2001 and 2008 pull the day’s average gain since 1982 negative. NASDAQ’s record is much weaker on Monday, declining 20 times in 32 years.
Moving forward to September option expiration day, it is generally bullish and has improved recently with DJIA up eight of the past ten years with an average gain of 0.5%. S&P 500 and NASDAQ have nearly identical recent track records.
Full-week performance has a somewhat spotty record over the last tens years for DJIA, up six and down four. However, S&P 500 and NASDAQ have fared better, both have gained in nine of the past eleven years.