Adtran Holdings, Inc.: Timothy Santo, Acquisition of 6,579 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059)

About this update from Adtran Holdings, Inc.

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them 10.08.2026 / 09:34 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: Timothy Last name(s): Santo 2. Reason for the notification a) Position / status Position: Chief Financial 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 6,579 shares in ADTRAN Holdings, Inc. (ISIN US00486H1059) c) Price(s) and volume(s) Price(s) Volume(s) 7.5999 USD 49,999.7421 USD d) Aggregated information Price Aggregated volume 7.5999 USD 49,999.7421 USD e) Date of the transaction 06/08/2026; UTC−4 f) Place of the transaction Name: NASDAQ MIC: XNAS 10.08.2026 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 LEI Code: 549300VV36J86CRRWF77   End of News EQS News Service 106420  10.08.2026 CET/CEST

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