X0306 4 2016-03-18 0 0000791908 XOMA Corp XOMA 0001210905 RUBIN PAUL D C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 0 1 0 0 Sr. VP Clinical Dev. & CMO Common Shares 2016-03-18 4 M 0 12141.0 0.0 A 350795 D Common Shares 2016-03-22 4 S 0 24194.0 0.7847 D 326601 D Common Shares 13422 I by 401(k) Restricted Stock Units 0.0 2016-03-18 4 M 0 12141.0 0.0 D 2014-03-18 2016-03-18 Common Shares 12141 0 D These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on March 18, 2014. Each restricted stock unit represents the right to receive, at settlement, one share of common stock. This nondiscretionary transaction represents the settlement of vested restricted stock units in shares of common stock. 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: Russell J. Wood For: Paul D. Rubin 2016-03-22