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 reaffirmed it expects to have top-line data from its ongoing proof-of-concept study of gevokizumab to treat moderate to severe acne vulgaris at year end 2012. 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. In order to retain significant value from its scientific discoveries, XOMA initiated commercial operations in January 2012 through the licensing of U.S. commercial rights to Servier's ACEON® (perindopril erbumine) and a patent-protected portfolio of product candidates.

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

The XOMA Corporation logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=5960

About Servier

Servier is a privately-run French research-based pharmaceutical company. Current therapeutic domains for Servier medicines are cardiovascular, metabolic, neurological, psychiatric and bone and joint diseases, as well as oncology. Servier is established in 140 countries worldwide with over 20,000 employees and a 2011 turnover of €3.9 billion. Servier invests 25% of its turnover in R&D.

More information is available at: www.servier.com

Forward-Looking Statements

Certain statements contained herein concerning the enrollment, timing, completion and the successful outcome of the gevokizumab clinical trials and regulatory approval of its product candidates, or that otherwise relate to future periods are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Actual results could differ materially from those anticipated due to certain risks inherent in the biotechnology industry and for companies engaged in the development of new products in a regulated market. These and other risks, including those scale-up, manufacturing and marketing capabilities, are described in more detail in XOMA's most recent filing on Form 10-K and in other SEC filings. Consider such risks carefully when considering XOMA's prospects as these statements are based on assumptions that may not prove accurate.
CONTACT: 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

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