Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Aug 18, 2025

Announcement Purchase of Own Shares

Athens, August 18, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 12/08/2025 – 14/08/2025, it purchased 40,800 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 (€)
12/8/2025	2,300	37,092.00	16.12700	16.10	16.16
13/8/2025	3,500	56,459.00	16.13110	16.11	16.19
14/8/2025	35,000	560,321.97	16.00920	15.92	16.10
Total	40,800	653,872.97	16.02630

Following this, the Company holds 3,607,569 own shares or 0.893% 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