Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Aug 25, 2025

Announcement Purchase of Own Shares

Athens, August 25, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 18/08/2025 – 22/08/2025, it purchased 88,600 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 (€)
18/8/2025	34,000	545,566.32	16.04610	15.95	16.09
19/8/2025	7,300	118,554.84	16.24040	16.12	16.33
20/8/2025	7,700	125,630.00	16.31560	16.21	16.37
21/8/2025	15,600	254,596.00	16.32030	16.27	16.34
22/8/2025	24,000	392,109.50	16.33790	16.30	16.36
Total	88,600	1,436,456.66	16.21283

Following this, the Company holds 3,696,169 own shares or 0.915% 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