Onconova Therapeutics, Inc. (NASDAQ:ONTX – Get Rating) was the recipient of a large drop in short interest in May. As of May 15th, there was short interest totalling 291,400 shares, a drop of 24.8% from the April 30th total of 387,400 shares. Based on an average daily volume of 540,800 shares, the days-to-cover ratio is […]