Naked Short Selling: Is it Information-Based Trading?

• In Event: Effect of Investors on Stock Returns

Abstract

Citing a widely held belief that naked short selling is not based on company fundamentals, the SEC (2008) has substantially tightened Reg. SHO close-out regulations in an effort to eliminate naked short selling. Contrary to accepted belief, we find that accounting fundamentals are highly significant in explaining naked short sales. Further, naked short sales contain incremental information about future stock prices: Abnormal returns from a long/short trading strategy that buys (sells short) shares with low (high) short interest are more than seven times larger using naked and covered short interest, compared to returns using only covered short interest (15.2 percent vs. 2.1 percent annualized). Our findings show that recent actions by regulators to eliminate naked short sales are likely to impede informed arbitrage and reduce market efficiency.

Authors

• Harrison Liu, The University of Texas at San Antonio

• Sean Thomas McGuire, Texas A&M University

• Edward P Swanson, Texas A&M University