X0306 4 2018-07-19 0 0000791908 XOMA Corp XOMA 0001731721 DATTA DEEPSHIKHA C/O XOMA CORPORATION 2200 POWELL STREET, SUITE 310 EMERYVILLE CA 94608 0 1 0 0 Chief Business Officer Non-Qualified Share Option (right to buy) 25.05 2018-07-19 4 A 0 24000 0.0 A 2028-07-19 Common Shares 24000 24000 D One-third of this grant (i.e., 8,000 options) will vest on the first anniversary of the date of grant and the remaining options will vest in equal monthly increments over the next twenty four (24) months thereafter. Deepshikha Datta 2018-07-23