Spero Therapeutics, Inc. (NASDAQ:SPRO – Get Rating) was the recipient of a significant increase in short interest in March. As of March 15th, there was short interest totalling 942,700 shares, an increase of 142.0% from the February 28th total of 389,500 shares. Based on an average trading volume of 459,100 shares, the days-to-cover ratio is […]