X0306 4 2014-05-22 0 0000791908 XOMA Corp XOMA 0001225476 BOWES WILLIAM K JR C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 0 0 0 Common Shares 2014-05-22 4 A 0 8400 0 A 21268 D Common Shares 1000 I by Spouse Non-Qualified Share Option (right to buy) 3.87 2014-05-22 4 A 0 11600 3.87 A 2024-05-22 Common Shares 11600 11600 D These shares were acquired pursuant to a grant of restricted stock units on May 22, 2014 under the Amended and Restated XOMA Corporation 2010 Long Term Incentive and Stock Award Plan and are scheduled to vest in substantially equal installments on each of May 28, 2015, May 28, 2016, and May 28, 2017. These shares were purchased and are held by Ute C. Bowes, the spouse of William K. Bowes, Jr. Exercisable with respect to 1/12th of options in monthly increments beginning June 22, 2014 and ending May 22, 2015. By: Russell J. Wood For: William K. Bowes, Jr. 2014-05-27