Net Income (Loss) per Share Attributable to Common Stockholders of Cullinan (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Net Loss Per Share

The following table sets forth the calculation of basic and diluted net income (loss) per share attributable to common stockholders of Cullinan for 2023 and 2022 (in thousands, except per share data):

	2023			2022
Numerator:
Net income (loss) attributable to common stockholders of Cullinan	$	(153,162	)	$	111,214
Denominator:
Weighted-average common stock outstanding - basic		41,550			45,164
Dilutive effect of common stock issuable from assumed exercise of equity awards		—			1,476
Weighted-average common stock outstanding - diluted		41,550			46,640
Net income (loss) per share attributable to common stockholders of Cullinan:
Basic	$	(3.69	)	$	2.46
Diluted	$	(3.69	)	$	2.38

Summary of Equity Instruments Excluded from Computation of Diluted Net Loss Per Share

The following table sets forth potential common shares that were excluded from the computation of the diluted net income (loss) per share attributable to common stockholders of Cullinan for 2023 and 2022 because their effect would have been anti-dilutive (in thousands):

	2023		2022
Stock options		9,418		6,842
Preferred stock		6,138		—
RSAs and RSUs		147		25
ESPP		9		7
Total		15,712		6,874