BIIB BIOGEN INC Company Mergers 8-K Filing 2023 - Merger Agreement Biogen Inc. has entered into an Agreement and Plan of Merger with Reata Pharmaceuticals, Inc., in which Reata will be merged with and into Biogen, with Reata surviving as a wholly-owned subsidiary of Biogen.Get access to all SEC 8-K filings of the BIOGEN INC