Hellenic Telecommunications Organization S.A.

M&A Activity • Dec 29, 2025

Announcement Purchase of Own Shares

Athens, December 29, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 22/12/2025 – 23/12/2025, it purchased 55,133 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 (€)
22/12/2025	47,217	794,477.21	16.82610	16.68	16.90
23/12/2025	7,916	133,451.72	16.85848	16.80	16.95
Total	55,133	927,928.93	16.83074

Following this, the Company holds 7,461,054 own shares or 1.847% 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