Is reversal of large stock‐price declines caused by overreaction or information asymmetry: Evidence from stock and option markets

The role of option markets is reexamined in the reversal process of stock prices following stock price declines of 10% or more. A matched pair of optionable and nonoptionable firms is randomly selected when their price declines by 10% or more on the same date. The authors examine the 1,443 and 1,018 matched pairs of New York Stock Exchange/American Stock Exchange (AMEX) and National Association of Securities Dealers Automated Quotations firms over the period from 1996 to 2004. It was found that the positive rebounds for nonoptionable firms are caused by an abnormal increase in bid–ask spread on and before the large price decline date. On the other hand, the bid–ask spreads for optionable firms decrease on and before the large price decline date. An abnormal increase in the open interest and volume in the option market on and before the large price decline date was also found. Overall, the results suggest that the stock‐price reversal neither is a result of overreaction nor can it be simply explained by the bid–ask bounce. © 2009 Wiley Periodicals, Inc. Jrl Fut Mark 29:348–376, 2009