Tecogen Inc. (OTCMKTS:TGEN – Get Free Report) saw a significant growth in short interest in May. As of May 31st, there was short interest totalling 1,000 shares, a growth of 900.0% from the May 15th total of 100 shares. Based on an average trading volume of 12,700 shares, the short-interest ratio is presently 0.1 days. […]