Adtran Holdings, Inc.: Anne DelSanto, Acquisition of 4,399 shares of restricted stock as part of Equity Incentive Compensation. The restrictions lapse upon vesting of the RSAs and unrestricted ...

Notification and public disclosure of transactions by persons discharging managerial responsibilities and persons closely associated with them

07.07.2026 / 09:31 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) Name2. Reason for the notification a) Position / status

• Position:
• Member of the Board of Directors

b) Initial notification3. 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 b) Nature of the transaction

Acquisition of 4,399 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) d) Aggregated information e) Date of the transaction

01/07/2026; UTC−5

f) Place of the transaction

Outside a trading venue

07.07.2026 CET/CEST The EQS Distribution Services include Regulatory Announcements, Financial/Corporate News and Press Releases.

105950 07.07.2026 CET/CESTSaving the news in databases or any forwarding of the news to third parties in a commercial context or for commercial purposes is only permitted with the prior written consent of EQS Group AG.