Xencor Initiates Phase 1b/2a Trial of XmAbR5871 for Autoimmune Disease MONROVIA, Calif., February 13, 2013—Xencor, Inc. today announced that the first patient has been dosed in a Phase 1b/2a clinical trial of XmAb®5871 in patients with moderate to severe rheumatoid arthritis.

MONROVIA, Calif., January 17, 2013—Xencor, Inc. today announced it has received a milestone payment from Janssen Research & Development, LLC (Janssen R&D) resulting from the exercised option for the use of Xencor's Xtend™ half-life extension technology in a therapeutic antibody.

MorphoSys AG (FSE: MOR; Prime Standard Segment, TecDAX) and US-based Xencor, Inc. today announced the online publication of first clinical data on the anti-CD19 antibody MOR208 (MOR00208/XmAb5574) in the American Society of Hematology Annual Meeting Abstracts issue of the peer-reviewed medical

Martinsried/Munich, Germany, and Monrovia, Calif., USA, May 22, 2012—MorphoSys AG (FSE: MOR; Prime Standard Segment, TecDAX) and US-based Xencor, Inc. today announced the successful completion of patient enrollment in the phase 1 clinical trial evaluating MOR208.

SEVENTH ANTIBODY DEVELOPED WITH XENCOR'S XmAb TECHNOLOGY MOVES INTO HUMAN TRIALS

Xencor Receives Second Milestone Payment from Boehringer Ingelheim Under Antibody Technology License Agreement MONROVIA, Calif., April 4, 2012 – Xencor, Inc. announced today that the Company received a milestone payment under a technology license agreement with Boehringer Ingelheim.

Antibodies engineered with Xencor's proprietary Xtend&#8482 technology for increasing antibody half-life

Xencor Initiates Phase 1 Study of XmAb ® 5871 Therapeutic Antibody For the Treatment of Autoimmune Diseases; Dual-Targeted Antibody Aims to Treat Lupus and Rheumatoid Arthritis by Suppressing Autoimmune Response Monrovia, Calif. – Oct. 21, 2011 – Xencor, Inc., a company using its

Monrovia, Calif. – March 9, 2011 – Xencor, Inc. announced positive results from preclinical studies of XmAb®5871, a humanized monoclonal antibody that dually targets CD19 and CD32b (FcyRIIb) for the treatment of autoimmune diseases, demonstrating that XmAb5871 is a potent suppressor of B cell

Amgen And Xencor Enter Option Deal To Co-develop Xencor's Novel Antibody For Autoimmune Diseases Thousand Oaks, Calif. and Monrovia, Calif. – (Jan. 6, 2011) – Amgen (NASDAQ: AMGN) and Xencor, Inc. announced today that they will collaborate to develop XmAb®5871, an Fc- engineered