Calfrac Well Services Ltd. (OTCMKTS:CFWFF – Get Free Report) was the target of a large increase in short interest in July. As of July 31st, there was short interest totalling 9,600 shares, an increase of 7.9% from the July 15th total of 8,900 shares. Based on an average daily volume of 5,800 shares, the days-to-cover […]