Historical stock prices for Pharmaceutical Resources (PRX). Par Pharmaceutical Companies, Inc. is a holding company that, principally through its wholly owned operating subsidiary, Par Pharmaceutical, Inc., is in the business of developing, licensing, manufacturing, marketing and distributing generic and branded drugs in the United States. The Company operates primarily in the United States as two business segments: Par Pharmaceutical (Par), its generic products division, and Strativa Pharmaceuticals (Strativa), its branded products division. In February 17, 2012, the Company acquired Edict Pharmaceuticals Private Limited. On November 17, 2011, it acquired Anchen Incorporated and its subsidiary, Anchen Pharmaceuticals, Inc. In October 2011, it acquired rights to three products from Teva Pharmaceuticals in connection with Teva's acquisition of Cephalon. In September 2012, certain affiliates of TPG acquired the Company.