Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Jul 21, 2025

Announcement Purchase of Own Shares

Athens, July 21, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 14/07/2025 – 18/07/2025, it purchased 307,800 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 (€)
14/7/2025	76,000	1,173,262.31	15.43770	15.21	15.52
15/7/2025	116,000	1,771,710.88	15.27340	15.10	15.52
16/7/2025	109,000	1,655,086.78	15.18430	15.03	15.40
17/7/2025	2,300	35,661.92	15.50520	15.43	15.54
18/7/2025	4,500	69,815.00	15.51440	15.47	15.56
Total	307,800	4,705,536.89	15.28764

Following this, the Company holds 11,983,798 own shares or 2.904% 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