Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Aug 8, 2025

Announcement Purchase of Own Shares

Athens, August 8, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 04/08/2025 – 07/08/2025, it purchased 103,520 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 (€)
4/8/2025	16,000	252,770.00	15.7981	15.66	15.83
5/8/2025	9,500	151,065.00	15.9016	15.80	15.98
6/8/2025	17,000	270,711.00	15.9242	15.86	15.99
7/8/2025	61,020	963,891.35	15.7963	15.69	15.90
Total	103,520	1,638,437.35	15.82725

Following this, the Company holds 3,566,769 own shares or 0.883% 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