Ballard Power Systems Inc. (NASDAQ:BLDP – Get Free Report) (TSE:BLD) saw a significant decrease in short interest in July. As of July 31st, there was short interest totalling 27,890,000 shares, a decrease of 13.5% from the July 15th total of 32,240,000 shares. Based on an average daily volume of 3,550,000 shares, the days-to-cover ratio is […]