 Blackrock Municipal 2030 Trgt Trm Trst NYSE:BTT saw a large growth in short interest in March. As of March 13th, there was short interest totalling 69,200 shares, a growth of 231.1 from the February 27th total of 20,900 shares. Based on an average daily trading volume, of 132,000 shares, the days-to-cover ratio is presently 0.5 ... 