Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Aug 4, 2025

Announcement Purchase of Own Shares

Athens, August 04, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 28/07/2025 – 01/08/2025, it purchased 98,400 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 (€)
28/7/2025	48,000	739,688.49	15.41020	15.37	15.53
29/7/2025	5,700	89,088.40	15.62950	15.39	15.93
30/7/2025	3,800	59,861.00	15.75290	15.70	15.83
31/7/2025	4,900	77,481.00	15.81240	15.78	15.85
1/8/2025	36,000	564,598.61	15.68330	15.63	15.80
Total	98,400	1,530,717.50	15.55607

Following this, the Company holds 3,463,249 own shares or 0.858% 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