Adtran Holdings, Inc. Adtran Holdings, Inc.: Christoph Glingener, Acquisition of 27,924 RSUs as part of Equity Incentive Compensation. The RSUs will pay out in shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) on a one-for-one basis.

Language:EnglishDE

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them
13.08.2026 / 17:38 CET/CEST
The issuer is solely responsible for the content of this announcement.

1. Details of the person discharging managerial responsibilities / person closely associated
a) Name

Title:
First name:	Christoph
Last name(s):	Glingener

2. Reason for the notification
a) Position / status

Position:

Chief Technology Officer

b) Initial notification
3. Details of the issuer, emission allowance market participant, auction platform, auctioneer or auction monitor
a) Name

Adtran Holdings, Inc.

b) LEI

549300VV36J86CRRWF77

4. Details of the transaction(s)
a) Description of the financial instrument, type of instrument, identification code

Type:	Share
Description:	Restricted Stock Units (RSUs) to be settled in shares in ADTRAN Holdings, Inc. (ISIN US00486H1059)

b) Nature of the transaction

Acquisition of 27,924 RSUs as part of Equity Incentive Compensation. The RSUs will pay out in shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) on a one-for-one basis.

c) Price(s) and volume(s)

Price(s)	Volume(s)
not numberable	not numberable

d) Aggregated information

Price	Aggregated volume
not numberable	not numberable

e) Date of the transaction

10/08/2026; UTC−5

f) Place of the transaction

Outside a trading venue

13.08.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.

Language:	English
Company:	Adtran Holdings, Inc.
	901 Explorer Boulevard
	35806 Huntsville
	United States
Internet:	www.adtran.com
LEI Code:	549300VV36J86CRRWF77


End of News	EQS News Service

106604 13.08.2026 CET/CEST