X0306 4 2015-05-21 0 0000791908 XOMA Corp XOMA 0001221676 VAN NESS W DENMAN C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 0 0 0 Common Shares 2015-05-21 4 A 0 36873.0 0.0 A 81900 D Common Shares 20 I by IRA Common Shares 10 I by Spouse Common Shares 2600 I by Trust Non-Qualified Share Option (right to buy) 3.39 2015-05-21 4 A 0 36873.0 3.39 A 2025-05-21 Common Shares 36873 36873 D These shares were acquired pursuant to a grant of restricted stock units on May 21, 2015, 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, 2016, May 28, 2017, and May 28, 2018. Owned directly through W. D. Van Ness IRA. Held indirectly through the C. Van Ness IRA. Shares owned directly by The Van Ness 1983 Revocable Trust. Exercisable with respect to 1/12th of options in monthly increments beginning June 21, 2015 and ending May 21, 2016. By: Russell J. Wood For: W. Denman Van Ness 2015-05-22