XOMA to Announce First Quarter 2013 Financial Results and Host Webcast on May 8

BERKELEY, Calif., April 25, 2013 (GLOBE NEWSWIRE) -- XOMA Corporation (Nasdaq:XOMA), a leader in the discovery and development of antibody therapeutics, announced the Company will host a conference call on Wednesday, May 8, 2013, at 4:30 p.m. Eastern time to discuss first quarter 2013 financial results and provide an update on gevokizumab's global clinical programs.

The webcast can be accessed via the Investors & Media section of XOMA's website at http://investors.xoma.com/events.cfm and will be available for replay until close of business on August 8, 2013.

Telephone numbers for the live audiocast are 877-369-6589 (U.S./Canada) and 408-337-0122 (international). A telephonic replay will be available beginning approximately two hours after the conclusion of the call until close of business on May 15, 2013. Telephone numbers for the replay are 855-859-2056 (U.S./Canada) and 404-537-3406 (international), replay Conference ID number 42348170.

About XOMA Corporation

XOMA combines a portfolio of innovative therapeutic antibodies, both in late-stage clinical development and in preclinical research, with its recently launched commercial operations. XOMA focuses its antibody research and development on allosteric modulation, which offers opportunities for new classes of therapeutic antibodies to treat a wide range of human diseases. XOMA is developing its lead product gevokizumab (IL-1 beta modulating antibody) with Servier through a global Phase 3 program in non-infectious uveitis and ongoing proof-of-concept studies in other IL-1-mediated diseases. XOMA's scientific research also produced the XMet program, which consists of three classes of preclinical antibodies, including Selective Insulin Receptor Modulators (SIRMs) that could have a major effect on the treatment of diabetes.

More detailed information can be found at www.xoma.com.

CONTACT: XOMA Corporation

         Company and Investor Contact:
         Ashleigh Barreto
         510-204-7482
         barreto@xoma.com

         Juliane Snowden
         The Oratorium Group, LLC
         jsnowden@oratoriumgroup.com

         Media Contact:
         Canale Communications
         Carolyn Hawley
         619-849-5375
         carolyn@canalecomm.com

Released April 25, 2013