X0306 4 2016-12-21 0 0000791908 XOMA Corp XOMA 0001222790 SCANNON PATRICK J MD PHD C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 0 1 0 1 Exec. VP & CSO Exec. VP & CSO Common Shares 2016-12-21 4 S 0 3230 5.75 D 8217 D Common Shares 1690 I by 401(k) Common Shares 37 I by Daughter Common Shares 202 I by Trust Shares sold on the open market to satisfy the 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 incentive plan. By: Denis Quinlan For: Patrick J. Scannon 2016-12-23