X0306 4 2017-02-10 0 0000791908 XOMA Corp XOMA 0001221676 VAN NESS W DENMAN C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 0 0 0 Non-Qualified Share Option (right to buy) 4.03 2017-02-10 4 A 0 8000 0.0 A 2027-02-10 Common Shares 8000 8000 D This option was approved by the Board of Directors of the Issuer on February 10, 2017, subject to approval by the Issuer's stockholders, at the 2017 Annual Meeting of Stockholders, of an amendment of the Issuer's 2010 Long Term Incentive and Stock Award Plan (the "Plan"), including an increase in the number of shares reserved for issuance under the Plan (the "Amendment"). The Stockholders of the Issuer approved the Amendment on May 18, 2017. Shares subject to this option shall vest in equal monthly installments over three years from the grant date. By: Thomas Burns For: W. Denman Van Ness 2017-05-22