Adtran Networks SE announced that the Chairwoman of the Supervisory Board, Prof. Dr. Johanna Hey, has informed the Company that she will resign from her position as a member of the Supervisory Board and as Chairwoman for private reasons with effect from June 30, 2023. Prof. Dr. Johanna Hey has been a member of the Supervisory Board since May 16, 2011. She has held the office of Chairwoman of the Supervisory Board since September 21, 2022.