Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Summary of Calculation of Basic and Diluted Loss Per Share

The calculation of basic and diluted loss per share for the quarters ended March 31, 2026 and 2025 are as follows:

	Three Months Ended
	March 31,
(In thousands, except per share amounts)	2026			2025
Numerator
Net loss attributable to ADTRAN Holdings, Inc.	$	(1,321	)	$	(11,267	)
Effect of redemption of RNCI		301			(3	)
Net loss attributable to ADTRAN Holdings, Inc. common stockholders	$	(1,020	)	$	(11,270	)
Denominator
Weighted average number of shares – basic		80,321			79,534
Weighted average number of shares – diluted		80,321			79,534
Loss per share attributable to ADTRAN Holdings, Inc. – basic	$	(0.01	)	$	(0.14	)
Loss per share attributable to ADTRAN Holdings, Inc. – diluted	$	(0.01	)	$	(0.14	)

Schedule of Antidilutive Securities Excluded from Earnings Per Share Computation

The following potentially dilutive shares were excluded from the calculation of the diluted weighted average number of shares outstanding as the effect would have been anti-dilutive:

	Three Months Ended
	March 31,
(In thousands)	2026		2025
Convertible senior notes		2,440		—
Stock options		794		711
PSUs, RSUs and restricted stock		446		202