Spero Therapeutics, Inc. (NASDAQ:SPRO – Get Rating) was the target of a large decline in short interest during the month of May. As of May 15th, there was short interest totalling 1,650,000 shares, a decline of 55.3% from the April 30th total of 3,690,000 shares. Based on an average daily volume of 634,900 shares, the […]