Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Jun 16, 2025

Announcement Purchase of Own Shares

Athens, June 16, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 10/06/2025 – 13/06/2025, it purchased 396,602 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 (€)
10/6/2025	108,343	1,864,294.40	17.20730	17.07	17.42
11/6/2025	110,535	1,871,793.94	16.93390	16.76	17.23
12/6/2025	111,430	1,866,563.20	16.75100	16.66	16.89
13/6/2025	66,294	1,111,699.63	16.75540	16.60	16.92
Total	396,602	6,714,351.17	16.92970

Following this, the Company holds 10,208,862 own shares or 2.474% 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