Adtran Networks SE: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution

EQS Voting Rights Announcement: Adtran Networks SE Adtran Networks SE: Release according to Article 40, Section 1 of the WpHG [the German Securities Trading Act] with the objective of Europe-wide distribution 13.05.2026 / 22:10 CET/CEST Dissemination of a Voting Rights Announcement transmitted by EQS News - a service of EQS Group. The issuer is solely responsible for the content of this announcement.

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Notification of Major Holdings

1. Details of issuer

Name:	Adtran Networks SE
Street:	Märzenquelle 1-3
Postal code:	98617
City:	Meiningen-Dreissigacker Germany
Legal Entity Identifier (LEI):	5299001QZNN0TKI9J120

2. Reason for notification

X	Acquisition/disposal of shares with voting rights
	Acquisition/disposal of instruments
	Change of breakdown of voting rights
	Other reason:

3. Details of person subject to the notification obligation

Legal entity: JPMorgan Chase & Co. City of registered office, country: Wilmington, Delaware, United States of America (USA)

4. Names of shareholder(s)
holding directly 3% or more voting rights, if different from 3.

J.P. Morgan Securities plc

5. Date on which threshold was crossed or reached:

11 May 2026

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