 Citigroup Inc. increased its stake in PDL BioPharma Inc NASDAQ:PDLI by 24.6 in the 4th quarter, according to the company in its most recent filing with the SEC. The institutional investor owned 153,508 shares of the biotechnology companys stock after acquiring an additional 30,311 shares during the quarter. Citigroup Inc. owned approximately 0.13 of PDL ... 