Using a broad sample of earnings announcements, we find that option call and put implied volatilities become increasingly misaligned as the earnings announcement dates (EAD) get closer. The percentage deviation between call and put implied volatilities increases monotonically in the one-month...

By using a unique dataset of daily short covering volumes obtained from the Taiwan Stock Exchange, we first examine, in general, what drives daily short covering activity in the cross-section and its return predictability; we then investigate, in specific, the relation between short covering and...