Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Oct 13, 2025

Announcement Purchase of Own Shares

Athens, October 13, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 06/10/2025 – 10/10/2025, it purchased 429,216 own shares, in the context of the Own Share Buy Back Programme for 2025, as follows:

Date	Number of shares	Total amount (€)	Average price (€)	Lowest price (€)	Highest price (€)
6/10/2025	89,824	1,431,334.29	15.93488	15.79	16.08
7/10/2025	91,711	1,456,219.09	15.87835	15.78	15.94
8/10/2025	91,121	1,447,461.39	15.88505	15.80	15.96
9/10/2025	87,690	1,392,963.34	15.88509	15.71	16.00
10/10/2025	68,870	1,098,916.82	15.95639	15.78	16.12
Total	429,216	6,826,894.93	15.90550

Following this, the Company holds 5,562,625 own shares or 1.377% of the total outstanding shares.

The announcement is issued in accordance with Regulation (EU) No 596/2014 of the European Parliament and of the Council of 16 April 2014 and the Commission Delegated Regulation (EU) 2016/1052 of 8 March 2016.

FOR FURTHER INFORMATION:

OTE GROUP INVESTOR RELATIONS Τel. +30 210 6117364, +30 210 6332342 E-mail: iroffice@ote.gr, eboua@ote.gr