Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Sep 29, 2025

Announcement Purchase of Own Shares

Athens, September 29, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 22/09/2025 – 26/09/2025, it purchased 322,214 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 (€)
22/9/2025	41,614	697,935.46	16.77165	16.70	16.87
23/9/2025	46,374	776,226.10	16.73839	16.67	16.85
24/9/2025	75,555	1,249,415.61	16.53650	16.34	16.75
25/9/2025	77,419	1,274,295.60	16.45973	16.31	16.53
26/9/2025	81,252	1,327,011.46	16.33205	16.22	16.40
Total	322,214	5,324,884.23	16.52592

Following this, the Company holds 4,723,661 own shares or 1.170% 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