 Alliancebernstein L.P. increased its position in shares of Opko Health Inc. NASDAQ:OPK by 2.3 in the fourth quarter, according to its most recent 13F filing with the Securities Exchange Commission. The institutional investor owned 517,625 shares of the biotechnology companys stock after purchasing an additional 11,600 shares during the quarter. Alliancebernstein L.P. owned approximately ... 