The purpose of this paper is to examine the impact of earnings preannouncements on the announcer’s rivals. We find rivals’ stock price react to preannouncements within one to two minutes following the disclosure. There is a delayed reaction to good news. Competitive effects exist in more concentrated industry (higher Herfindahl index) under bad news preannouncements while contagion effects exist in more concentrated industry. Contagion effects exist in more levered industry (higher leverage ratio) no matter under good or bad news preannouncements. Disclosure quality affects the reaction. Quantitative disclosures elicit larger price response and the speed of reactions is faster.