 EMERYVILLE, Calif., April 05, 2021 GLOBE NEWSWIRE -- XOMA Corporation Nasdaq: XOMA XOMA or the Company today announced it has commenced an underwritten registered public offering of depositary shares, each representing 11000th fractional interest in a share of the Companys Series B Cumulative Perpetual Preferred Stock, with liquidation preference of 25.00 per depositary share, subject to market and certain other conditions. The Company expects to grant the underwriters a 30-day option to purchase additional depositary shares in connection with the offering. 