Ballard Power Systems, Inc. (NASDAQ: BLDP - Get Free Report) (TSE: BLD) saw a large drop in short interest in the month of July. As of July 31st, there was short interest totaling 16,558,574 shares, a drop of 35.7% from the July 15th total of 25,762,152 shares. Currently, 5.5% of the shares of the stock are sold








