Quarterly report [Sections 13 or 15(d)]

Capital Stock - BVF Ownership (Details)

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Capital Stock - BVF Ownership (Details) - BVF - Xoma Royalty Corporation - Common Stock
Mar. 31, 2026
Sale of stock  
Ownership interest (as a percent) 21.70%
Ownership interest, if shares are converted (as a percent) 44.90%