We document significant increases in short positions on days when company insiders sell their firms’ shares. Short selling increases before insider sales are publicly reported and often before insiders finish selling. Furthermore, the magnitude of short selling activity is consistent with...

Purpose – The purpose of this paper is to investigate what is denoted as episodes of concentrated short-selling activity, or consecutive days of abnormal short-sale activity in a particular stock. The motivation to do so is two fold. First, US regulators and regulators in other countries have...