April option expiration is generally bullish across the board with solid gains on the last day of the week, the entire week and the week after. Since 1982, DJIA and S&P 500 have both advanced 23 times in 36 years on expiration day with an average gain of just under 0.2%. Expiration week as a whole has a slightly more bullish track record over the past 36 years to expiration day. Average weekly gains are 1% or better for S&P 500, DJIA and NASDAQ. The bullish bias of April expiration also persists during the week after. DJIA has posted a full-week gain in twelve of the last fourteen weeks following expiration.