X0306 4 2017-03-21 0 0000791908 XOMA Corp XOMA 0001600865 Neal James R C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 1 1 0 1 VP Business Development VP Business Development Common Shares 2017-03-21 4 S 0 5105 5.4004 D 15366 D Common Shares 2961 I by 401(k) Indirect ownership includes shares acquired from a 401(k) match accumulated during 2016 and purchased on 1/26/2017, deemed not reportable. 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. Shares sold at multiple prices between $5.4002 and $5.4004 with a weighted average sale price of $5.40038. Includes unvested RSUs previously reported on Table I. James R. Neal 2017-03-23