X0306 4 2015-03-18 0 0000791908 XOMA Corp XOMA 0001572521 Klein Thomas C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY CA 94710 0 1 0 0 Chief Commercial Officer Common Shares 2015-03-18 4 M 0 80000.0 0.0 A 238050 D Common Shares 2015-03-18 4 M 0 667.0 0.0 A 238717 D Common Shares 2015-03-18 4 D 0 373.0 4.0105 D 238344 D Common Shares 2015-03-18 4 D 0 44591.0 4.0105 D 193753 D Common Shares 2015-03-18 4 D 0 8073.0 4.0105 D 185680 D Common Shares 4660 I by 401(k) Restricted Stock Units 0.0 2015-03-18 4 M 0 80000.0 0.0 D 2014-03-18 2016-03-18 Common Shares 80000 81333 D Restricted Stock Units 0.0 2015-03-18 4 M 0 667.0 0.0 D 2014-03-18 2016-03-18 Common Shares 667 80666 D These shares were acquired pursuant to a grant of restricted stock units on March 18, 2013 under the Amended and Restated XOMA Corporation 2010 Long Term Incentive and Stock Award Plan and are scheduled to vest in substantially equal installments on each of March 18, 2014, March 18, 2015, and March 18, 2016. 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 shares were acquired pursuant to a grant of restricted stock units on May 23, 2013 under the Amended and Restated XOMA Corporation 2010 Long Term Incentive and Stock Award Plan and are scheduled to vest in substantially equal installments on each of March 18, 2014, March 18, 2015, and March 18, 2016. 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. This transaction was executed in multiple trades ranging at prices from $3.93 to $4.15.The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. 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. 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. By: Russell J. Wood For: Thomas Klein 2015-03-20