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 (As Restated)			2022			2023 (As Restated)			2022
Numerator
Net loss attributable to ADTRAN Holdings, Inc.	$	(78,563	)	$	(41,934	)	$	(157,743	)	$	(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	$	(1.00	)	$	(0.57	)	$	(2.01	)	$	(0.72	)
Loss per share attributable to ADTRAN Holdings, Inc. – diluted	$	(1.00	)	$	(0.57	)	$	(2.01	)	$	(0.72	)