Diether, Lee, and Werner (2009) show that, in general, short sellers are contrarian in both contemporaneous and past returns and able to impressively predict future returns. This study examines these trading characteristics during both the trading day and the after-hours period. Interestingly,...

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...