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XOMA Announces Proposed Public Offering of Common Stock

XOMA Corporation Logo

BERKELEY, Calif., Oct. 23, 2012 (GLOBE NEWSWIRE) -- XOMA Corporation (Nasdaq:XOMA) announced today it is offering to sell, subject to market and other conditions, shares of its common stock pursuant to an effective shelf registration statement in an underwritten public offering. XOMA also expects to grant the underwriters a 30-day option to purchase up to an additional 15 percent of the shares of common stock offered in the public offering to cover over-allotments, if any.

Credit Suisse Securities (USA) LLC and Cowen and Company, LLC are acting as joint book-running managers. The shares of common stock will be issued pursuant to a prospectus supplement filed as part of a shelf registration statement previously filed with the Securities and Exchange Commission (SEC) on Form S-3.

This press release does not constitute an offer to sell or a solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. This press release is being issued pursuant to and in accordance with Rule 134 under the Securities Act of 1933, as amended. Any offer, if at all, will be made only by means of a prospectus supplement and accompanying prospectus forming a part of the effective registration statement. Copies of the prospectus supplement and accompanying prospectus relating to the offering may be obtained from Credit Suisse Securities (USA) LLC, Attention: Credit Suisse Prospectus Department, One Madison Avenue, New York, NY 10010; tel: 1-800-221-1037, or from Cowen and Company, LLC c/o Broadridge Financial Services, 1155 Long Island Avenue, Edgewood, NY 11717, Attn: Prospectus Department, Phone: 631-274-2806, Fax: 631-254-7140. XOMA intends to file a final prospectus supplement relating to the offering with the SEC, which will be available along with the accompanying prospectus filed with the SEC in connection with the shelf registration, on the SEC's website at http://www.sec.gov/.

About XOMA

XOMA discovers and develops innovative antibody therapeutics.

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

Forward-Looking Statements

Certain statements contained in this press release including, but not limited to, statements related to anticipated completion and timing of the proposed public offering 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. These statements are based on assumptions that may not prove accurate, and actual results could differ materially from those anticipated due to certain risks and uncertainties including, without limitation, risks and uncertainties related to market conditions and satisfaction of customary closing conditions related to the public offering. There can be no assurance that XOMA will be able to complete the public offering on the anticipated terms, or at all. Risks and uncertainties relating to XOMA and its business can be found in the "Risk Factors" section of XOMA's most recent filing on Form 10-K and in other SEC filings. Consider such risks carefully when considering XOMA's prospects. Any forward-looking statement in this press release represents XOMA's views only as of the date of this press release and should not be relied upon as representing its views as of any subsequent date. XOMA disclaims any obligation to update any forward-looking statement, except as required by applicable law.

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

Source:XOMA Corporation