Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Sep 22, 2025

Announcement Purchase of Own Shares

Athens, September 22, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 15/09/2025 – 19/09/2025, it purchased 72,632 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 (€)
15/9/2025	2,502	41,810.52	16.71084	16.66	16.79
16/9/2025	2,976	49,906.76	16.76974	16.70	16.89
17/9/2025	37,068	615,951.36	16.61680	16.47	16.81
18/9/2025	15,735	263,722.24	16.76023	16.63	16.90
19/9/2025	14,351	241,686.18	16.84107	16.66	16.96
Total	72,632	1,213,077.06	16.70169

Following this, the Company holds 4,401,447 own shares or 1.090% 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