X0306 4 2018-04-26 0 0000791908 XOMA Corp XOMA 0001600865 Neal James R C/O XOMA CORPORATION 2200 POWELL STREET, SUITE 310 EMERYVILLE CA 94608 1 1 0 0 CEO Common Shares 2018-04-26 4 M 0 8345 5.5 A 24678 D Common Shares 2018-04-26 4 S 0 8345 24.6914 D 16333 D Common Shares 2018-04-27 4 M 0 15655 5.5 A 31988 D Common Shares 2018-04-27 4 S 0 15655 24.4162 D 16333 D Common Shares 2961 I by 401(k) Non-Qualified Share Option (right to buy) 5.5 2018-04-26 4 M 0 8345 0.0 D 2017-12-21 2026-12-22 Common Shares 8345 91655 D Non-Qualified Share Option (right to buy) 5.5 2018-04-27 4 M 0 15655 0.0 D 2017-12-21 2026-12-22 Common Shares 15655 76000 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.50 to $25.00, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.25 to $24.835, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. James R. Neal 2018-04-27