Common Contracts

1,400,000 Depositary Shares XOMA CORPORATION Each Representing 1/1000th of a Share of 8.375% Series B Cumulative Perpetual Preferred Stock UNDERWRITING AGREEMENT

Underwriting Agreement • April 8th, 2021 • XOMA Corp • Pharmaceutical preparations • New York

• Contract Type
  Underwriting Agreement
• Filed
  April 8th, 2021
• Company
  XOMA Corp
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

The issuer has filed a registration statement (including a base prospectus dated March 19, 2021) and a preliminary prospectus supplement dated April 5, 2021 with the Securities and Exchange Commission (“SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering.

880,000 Shares XOMA CORPORATION 8.625% Series A Cumulative Perpetual Preferred Stock UNDERWRITING AGREEMENT

Underwriting Agreement • December 11th, 2020 • XOMA Corp • Pharmaceutical preparations • New York

• Contract Type
  Underwriting Agreement
• Filed
  December 11th, 2020
• Company
  XOMA Corp
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

The issuer has filed a registration statement (including a base prospectus dated April 5, 2018) and a preliminary prospectus supplement dated December 10, 2020 with the Securities and Exchange Commission (“SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering.