Disclosure of allegedly illegal corporate activities and information risk

We investigate how the disclosure of allegedly illegal corporate activities such as the backdating of stock option grants affects the “information risk” of accused companies. This research provides evidence about the consequences of this risk change on equity values. We compare the earnings' response coefficients (ERC) for companies charged with backdating before and after it was revealed that these companies allegedly engaged in these activities. Our results show a U-shape pattern in ERC across post-backdating periods, suggesting a temporary decline in information risk. We also estimate the amount of company valuation losses that are based on the changes in the ERC. We find, on average, that a firm suffered approximately $26.2 million in valuation losses for four quarterly earnings announcements in the post-backdating period. Our economic significance analysis suggests that valuation losses related to changes in “information risk” provide some explanations for the subsequent market valuation consequences.