Adtran Holdings, Inc.: Nikos Theodosopoulos, Acquisition of 13,809 shares of restricted stock as part of Equity Incentive Compensation. The restrictions lapse upon vesting of the RSAs and ...

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them 07.01.2026 / 10:19 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: Nikos Last name(s): Theodosopoulos 2. Reason for the notification a) Position / status Position: Member of the Board of Directors 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 Awards (RSAs) regarding shares in ADTRAN Holdings, Inc. (ISIN US00486H1059 b) Nature of the transaction Acquisition of 13,809 shares of restricted stock as part of Equity Incentive Compensation. The restrictions lapse upon vesting of the RSAs and unrestricted shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) are held. c) Price(s) and volume(s) Price(s) Volume(s) 0.00 USD 0.00 USD d) Aggregated information Price Aggregated volume not numberable not numberable e) Date of the transaction 31/12/2025; UTC−6 f) Place of the transaction Outside a trading venue 07.01.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases. View original content: EQS News

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

End of News	EQS News Service

102770  07.01.2026 CET/CEST