X0306 4 2015-08-14 0 0000791908 XOMA Corp XOMA 0001416176 Varian John C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 1 0 0 CEO Common Shares 2015-08-14 4 D 0 35799.0 0.8335 D 516615 D Common Shares 2015-08-14 4 M 0 94573.0 0.0 A 611188 D Common Shares 18538 I by 401(k) Restricted Stock Units 0.0 2015-08-14 4 M 0 94573.0 0.0 D Common Shares 94573 195239 D 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. 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. These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on August 14, 2013. By: Russell J. Wood For: John Varian 2015-08-18