Discretionary Announcement Timing and Stock Returns

Discretionary announcement timing generates high conditional risk premia of stock returns and a pattern of negative drifts followed by positive jumps. Average announcement returns are much larger than unconditional risk premia. Capital Asset Pricing Model alphas turn negative when conditioning on nondisclosure because betas rise faster than risk premia prior to disclosures, but average announcement returns may appear to be too large relative to market risk when betas are estimated from past returns. The effects are amplified when multiple firms exercise discretion over the timing of correlated announcements. We present evidence that firms time earnings announcements in a manner consistent with our model.