Gil Sadka

Liquidity and the Post-Earnings-Announcement Drift

Coauthor(s): Tarun Chordia, Amit Goyal, Ronnie Sadka, Lakshmanan Shivakumar.

Abstract:
The post-earnings-announcement drift is a longstanding anomaly that conflicts with market efficiency. This study documents that the post-earnings-announcement drift occurs mainly in highly illiquid stocks. A trading strategy that goes long high-earnings-surprise stocks and short low-earnings-surprise stocks provides a monthly value-weighted return of 0.04 percent in the most liquid stocks and 2.43 percent in the most illiquid stocks. The illiquid stocks have high trading costs and high market impact costs. By using a multitude of estimates, the study finds that transaction costs account for 70?100 percent of the paper profits from a long?short strategy designed to exploit the earnings momentum anomaly.

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