Loss per share (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Loss Earnings Per Share

The calculation of basic and diluted loss per share is as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In thousands, except per share amounts)	2023			2022			2023			2022
Numerator
Net loss attributable to ADTRAN Holdings, Inc.	$	(72,735	)	$	(41,934	)	$	(140,533	)	$	(40,918	)
Denominator
Weighted average number of shares – basic		78,389			73,036			78,378			57,175
Effect of dilutive securities
Stock options		—			—			—			—
PSUs, RSUs and restricted stock		—			—			—			—
Weighted average number of shares – diluted		78,389			73,036			78,378			57,175
Loss per share attributable to ADTRAN Holdings, Inc. – basic	$	(0.93	)	$	(0.57	)	$	(1.79	)	$	(0.72	)
Loss per share attributable to ADTRAN Holdings, Inc. – diluted	$	(0.93	)	$	(0.57	)	$	(1.79	)	$	(0.72	)