 PDL BioPharma Inc NASDAQ:PDLI was the target of a significant decline in short interest during the month of March. As of March 31st, there was short interest totalling 5,950,000 shares, a decline of 14.0 from the March 15th total of 6,920,800 shares. Currently, 5.0 of the companys shares are sold short. Based on an average ... 