EQS — PVR: 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 24.09.2026 / 00:19 CET/CEST Dissemination of a Voting Rights Announcement transmitted by 1 EQS News — a service of 2 EQS Group. The issuer is solely responsible for the content of this announcement. ══════════════════════════════════════════════════════════════════════════ 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/d