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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (67,408)	$ (21,954)	$ (136,117)	$ (82,717)
Net unrealized gain (loss) on marketable debt securities	(498)	1,765	(1,942)	5,093
Comprehensive loss	(67,906)	(20,189)	(138,059)	(77,624)
Comprehensive loss attributable to non-controlling interest	(1,445)	0	(2,121)	0
Comprehensive loss attributable to Xencor, Inc.	$ (66,461)	$ (20,189)	$ (135,938)	$ (77,624)

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