Adtran Holdings, Inc.: Christoph Glingener, Acquisition of 1,906 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) due to the vesting of 1,906 Restricted Stock Units (granted May 24, ...

About this update from Adtran Holdings, Inc.

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them 29.05.2026 / 09:16 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 ISIN: US00486H1059 b) Nature of the transaction Acquisition of 1,906 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) due to the vesting of 1,906 Restricted Stock Units (granted May 24, 2023) pursuant to the 2020 Employee Stock Incentive Plan. c) Price(s) and volume(s) Price(s) Volume(s) 15.67 USD 29,867.02 USD d) Aggregated information Price Aggregated volume 15.67 USD 29,867.02 USD e) Date of the transaction 24/05/2026; UTC−5 f) Place of the transaction Outside a trading venue 29.05.2026 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 105220  29.05.2026 CET/CEST

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