X0306 4 2013-11-13 0 0000791908 XOMA Corp XOMA 0001222790 SCANNON PATRICK J MD PHD C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 1 0 0 Exec. VP & CSO Common Shares 2013-11-13 4 M 0 22652 0 A 50363 D Common Shares 2013-11-13 4 S 0 8346 3.9132 D 42017 D Common Shares 20339 I by 401(k) Common Shares 750 I by Daughter Common Shares 4053 I by Trust Restricted Stock Units 0 2013-11-13 4 M 0 22652 0 D 2015-08-14 Common Shares 22652 9876 D These restricted stock units were granted on October 27, 2011 and are scheduled to vest in substantially equal installments on each of November 13, 2012, November 13, 2013 and November 14, 2014. Each restricted stock unit represents the right to receive, upon vesting, one share of common stock. This nondiscretionary transaction represents the vesting of restricted stock units as shares of common stock. Shares sold on the open market to satisfy the minimum amount of taxes required to be withheld in connection with the vesting of the shares in a non-discretionary transaction pursuant to the reporting person's agreement under the Company's equity incentive plan. By: Russell J. Wood For: Patrick J. Scannon, MD, PhD 2013-11-15