Since 1994, October’s expiration day tends to be mixed with modest average losses across the board even though S&P 500 and NASDAQ have advanced more often than not. Expiration week and the week after have been mildly bullish. DJIA and S&P 500 have the best long-term records. October’s reputation for volatility can be seen with wild daily and weekly swings in the tables below. Weekly moves in excess of 4% appear throughout the tables below. However, not all of those big weeks were losers especially during the following week.