Cogna Educação S.A. (OTCMKTS:COGNY – Get Rating) was the recipient of a large increase in short interest in May. As of May 31st, there was short interest totalling 44,200 shares, an increase of 103.7% from the May 15th total of 21,700 shares. Based on an average daily volume of 54,600 shares, the days-to-cover ratio is […]