What is Post Earnings Announcement Drift?(포스트 실적 발표 드리프트란?) Posted By: Steve Burnson: In trading and investing post earnings announcement drift (or PEAD) is the theory that a stock’s price action tends to trend in the same direction as an earnings surprise causes it to go. This effect usually starts with a gap in the direction that it will go for the next few weeks or even months in some cases. ..