Abstract

Almost all U.S. firms now announce earnings outside of regular trading hours. This paper studies how stock prices incorporate information in after-hours trading. I find slow prices adjustment accompanied by significant trading volume. During 2002-2012, 5,881 rule-based trading opportunities generate an average return of 1.53% within four hours. After costs (assessed by a trading experiment), an investor who properly exploits the slow adjustment beats the market by 11.5% per year. The slow price adjustment persists under various levels of investor inattention, limited arbitrage capital, and short-sale constraints.

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