Do Short Sellers Front-Run Insider Sales?

Abstract

We find evidence of significant increases in short sales immediately prior to large insider sales, consistent with information leakage and front-running. We examine a number of alternative explanations that the increase in short sales is driven by public information about the firm or about the impending insider sale, but the evidence is inconsistent with these explanations. The result has implications for the enforcement of insider information regulations, and for timely disclosure of short sales information by stock exchanges.