Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2021

Summary of Calculation of Basic and Diluted Net Loss Per Share

The following table sets forth the calculation of basic and diluted net loss per share:

	Three Months Ended March 31,
	2020			2021
	(in thousands, except share and per share data)
Numerator:
Net loss attributable to common stockholders of Cullinan	$	(4,973	)	$	(70	)
Denominator
Total weighted-average shares used in computing net loss per share, basic and diluted		18,747,004			41,977,336
Net Loss per Share:	$	(0.27	)	$	(0.00	)

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

The following outstanding equity instruments were excluded from the computation of the diluted net loss per share for the periods presented because their effect would have been anti-dilutive:

	Three Months Ended March 31,
	2020		2021
Restricted stock awards		478,293		242,411
Stock options		—		6,600,953
Estimated shares issuable under the ESPP		—		10,101
Total		478,293		6,853,465