North American Cannabis Holdings, Inc. (OTCMKTS:USMJ – Get Rating) saw a significant increase in short interest during the month of May. As of May 31st, there was short interest totalling 917,600 shares, an increase of 3,555.8% from the May 15th total of 25,100 shares. Based on an average daily volume of 35,389,800 shares, the days-to-cover […]