Adtran Holdings, Inc.: James Denson Wilson Jr, Transfer of 10,469 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) as donation.

About this update from Adtran Holdings, Inc.

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them 26.05.2026 / 08:54 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: James Denson Last name(s): Wilson Jr 2. Reason for the notification a) Position / status Position: Chief Revenue 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 ISIN: US00486H1059 b) Nature of the transaction Transfer of 10,469 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) as donation. 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 22/05/2026; UTC−5 f) Place of the transaction Outside a trading venue 26.05.2026 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 105100  26.05.2026 CET/CEST

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