Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Dec 8, 2025

Announcement Purchase of Own Shares

Athens, December 08, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 01/12/2025 – 05/12/2025, it purchased 328,171 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 (€)
1/12/2025	29,363	504,779.39	17.19100	17.11	17.27
2/12/2025	76,443	1,331,327.60	17.41600	17.35	17.54
3/12/2025	78,204	1,356,095.96	17.34050	17.28	17.40
4/12/2025	72,958	1,271,974.03	17.43430	17.33	17.50
5/12/2025	71,203	1,235,983.00	17.35860	17.24	17.42
Total	328,171	5,700,159.98	17.36948

Following this, the Company holds 6,864,933 own shares or 1.700% 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