 Akcea Therapeutics Inc NASDAQ:AKCA was the target of a large drop in short interest during the month of September. As of September 15th, there was short interest totalling 1,170,000 shares, a drop of 60.3 from the August 31st total of 2,950,000 shares. Approximately 7.0 of the companys shares are short sold. Based on an average ... 