XOMA XOMA Royalty Corporation

XOMA Corporation (Nasdaq: XOMA) (“XOMA” or the “Company”) today announced its Board of Directors has authorized the following cash dividends to holders of XOMA’s Series A and Series B Cumulative Preferred Stock:

Holders of the 8.625% Series A Cumulative Perpetual Preferred Stock (Nasdaq: XOMAP) shall receive a cash dividend equal to $0.53906 per share.

Holders of depositary shares, each representing 1/1000 of a share of XOMA’s 8.375% Series B Cumulative Perpetual Preferred Stock (Nasdaq: XOMAO), shall receive a cash dividend equal to $0.52344 per depositary share.

The preferred dividends will be paid on or about October 16, 2023, to respective holders of record at the close of business on October 5, 2023.

About XOMA CorporationXOMA is a biotechnology royalty aggregator playing a distinctive role in helping biotech companies achieve their goal of improving human health. XOMA acquires the potential future economics associated with pre-commercial therapeutic candidates that have been licensed to pharmaceutical or biotechnology companies. When XOMA acquires the future economics, the seller receives non-dilutive, non-recourse funding they can use to advance their internal drug candidate(s) or for general corporate purposes. The Company has an extensive and growing portfolio with more than 70 assets (asset defined as the right to receive potential future economics associated with the advancement of an underlying therapeutic candidate). For more information about the Company and its portfolio, please visit www.xoma.com.

Forward-Looking Statements/Explanatory NotesCertain statements contained in this press release are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, amended, and Section 21E of the Securities Exchange Act of 1934, as amended. In some cases, you can identify such forward-looking statements by terminology such as “will” or “shall”, the negative of these terms or similar expressions. These forward-looking statements are not a guarantee of XOMA’s performance, and you should not place undue reliance on such statements. These statements are based on assumptions that may not prove accurate, and actual results could differ materially from those anticipated due to certain risks inherent in the biotechnology industry, including those related to the fact that our product candidates subject to out-license agreements are still being developed, and our licensees may require substantial funds to continue development which may not be available; we do not know whether there will be, or will continue to be, a viable market for the products in which we have an ownership or royalty interest; if the therapeutic product candidates to which we have a royalty interest do not receive regulatory approval, our third-party licensees will not be able to market them, and the impact to the global economy as a result of the COVID-19 pandemic.  Other potential risks to XOMA meeting these expectations are described in more detail in XOMA's most recent filing on Form 10-Q and in other SEC filings.  Consider such risks carefully when considering XOMA's prospects.  Any forward-looking statement in this press release represents XOMA's beliefs and assumptions only as of the date of this press release and should not be relied upon as representing its views as of any subsequent date.  XOMA disclaims any obligation to update any forward-looking statement, except as required by applicable law.

EXPLANATORY NOTE: Any references to “portfolio” in this press release refer strictly to milestone and/or royalty rights associated with a basket of drug products in development.  Any references to “assets” in this press release refer strictly to milestone and/or royalty rights associated with individual drug products in development.

As of the date of this press release, all assets in XOMA’s milestone and royalty portfolio, except Vabysmo® (faricimab), are investigational compounds. Efficacy and safety have not been established with any of these investigational assets, and there is no guarantee that any will become commercially available.

Investor contact: Juliane Snowden XOMA+1-646-438-9754juliane.snowden@xoma.com

Media contact:Kathy VincentKV Consulting & Management+1-310-403-8951kathy@kathyvincent.com