 EMERYVILLE, Calif., Dec. 10, 2020 GLOBE NEWSWIRE -- XOMA Corporation Nasdaq: XOMA XOMA or the Company today announced it has commenced an underwritten registered public offering of shares of its Series A Cumulative Perpetual Preferred Stock, with liquidation preference of 25.00 per share the Preferred Stock. The Company expects to grant the underwriters a 30-day option to purchase additional shares of the Preferred Stock in connection with the offering. 