Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Jul 11, 2025

Announcement Purchase of Own Shares

Athens, July 11, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 07/07/2025 – 11/07/2025, it purchased 402,900 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 (€)
7/7/2025	70,000	1,103,720.00	15.76740	15.61	15.85
8/7/2025	73,900	1,161,525.70	15.71750	15.62	15.78
9/7/2025	41,500	654,340.56	15.76720	15.66	15.83
10/7/2025	102,000	1,590,028.42	15.58850	15.49	15.75
11/7/2025	115,500	1,783,538.58	15.44190	15.30	15.58
Total	402,900	6,293,153.26	15.61964

Following this, the Company holds 11,675,998 own shares or 2.829% 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