X0306 4 2019-09-18 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 Chief Executive Officer Common Stock 2019-09-18 4 M 0 3830 5.50 A 21499 D Common Stock 2019-09-18 4 S 0 3830 21.9616 D 17669 D Common Stock 2019-09-19 4 M 0 6370 5.50 A 24039 D Common Stock 2019-09-19 4 S 0 3728 20.6891 D 20311 D Common Stock 2019-09-19 4 S 0 2642 21.7317 D 17669 D Common Stock 2019-09-20 4 M 0 5452 5.50 A 23121 D Common Stock 2019-09-20 4 S 0 5452 20.2257 D 17669 D Common Stock 4202 I By 401(k) Stock Option (right to buy) 5.50 2019-09-18 4 M 0 3830 0.00 D 2017-12-21 2026-12-22 Common Stock 3830 72170 D Stock Option (right to buy) 5.50 2019-09-19 4 M 0 6370 0.00 D 2017-12-21 2026-12-22 Common Stock 6370 65800 D Stock Option (right to buy) 5.50 2019-09-20 4 M 0 5452 0.00 D 2017-12-21 2026-12-22 Common Stock 5452 60348 D The reporting person's Form 3 and certain of his subsequent Form 4s contained an inadvertent error in the number of shares directly owned reported in Column 5. The number of shares reported in Column 5 of this Form 4 has been adjusted to correct that error. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.85 to $22.00, 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 $20.52 to $21.40, 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 $21.6350 to $21.9750, 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 $20.00 to $20.7150, 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 /s/ Thomas Bums, as attorney-in-fact for James R. Neal 2019-09-20