 Acacia Research Corp NASDAQ:ACTG saw a large increase in short interest during the month of April. As of April 15th, there was short interest totalling 603,700 shares, an increase of 8.5 from the March 31st total of 556,500 shares. Based on an average daily trading volume, of 212,500 shares, the short-interest ratio is presently 2.8 ... 