Next week is options expiration week and mid-August is often better performing than the beginning and the end of the month. This strength is punctuated with a four-day string of bullish days that wrap the weekend from August 14 to 19. A bullish day is defined as a trading day in which the S&P 500 has risen greater than or equal to 60% of the time over the past 21 years. Unfortunately, this bullish cluster has not always resulted in full-week gains during option expiration as noted in the table below.