Xencor Secures U.S. Patent 12,492,253 Extending Antibody Half-Life to 2028
Xencor announced the issuance of U.S. Patent 12,492,253, which covers Xencor's Xtend Fc domain for extending the half-life of antibodies targeting C5, with a term that extends into December 2028. The new patent term is approximately three years longer than the previous latest-to-expire U.S. patent covering the Xtend Fc domain. Xencor now anticipates receiving low-single digit royalties on net sales of Ultomiris, an anti-C5 antibody engineered with a licensed Xtend Fc domain, into December 2028 in the United States. Ultomiris is a drug being developed and commercialized by Alexion Pharmaceuticals, Inc., and is a registered trademark of Alexion. Xencor has also previously secured regulatory extensions of exclusivity in several EU countries, Japan and Australia.
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Xencor Extends Ultomiris Patent to 2028, Anticipates $100M to $120M in Additional Revenue
- Patent Extension: Xencor has been granted U.S. Patent 12,492,253 covering its Xtend™ Fc domain, extending the patent term to December 2028, which is approximately three years longer than the previous patent, ensuring low-single digit royalty income from Ultomiris.
- Potential Revenue Growth: Based on consensus sales forecasts, Xencor anticipates receiving an additional $100 million to $120 million in royalties during the extended patent term, which will support funding for its internal pipeline as it advances in clinical development.
- Strategic Partnership: OMERS has acquired royalties due to Xencor on global Ultomiris sales starting in 2026, with potential annual revenues of up to $35 million, enhancing the company's financial stability as excess royalties revert to Xencor.
- Technological Advantage: Xencor's Xtend antibody half-life extension technology provides new therapeutic mechanisms for its XmAb medicines, driving innovation in cancer and autoimmune disease treatments, aligning with its long-term value creation strategy.