Spero Therapeutics, Inc. (NASDAQ:SPRO – Get Free Report) was the recipient of a large drop in short interest in January. As of January 15th, there was short interest totalling 680,200 shares, a drop of 13.8% from the December 31st total of 789,000 shares. Based on an average daily volume of 171,200 shares, the days-to-cover ratio […]