Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Dec 1, 2025

Announcement Purchase of Own Shares

Athens, Decamber 01, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 24/11/2025 – 28/11/2025, it purchased 52,213 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 (€)
24/11/2025	0	0.00	0.00000	0.00	0.00
25/11/2025	50	857.00	17.14000	17.14	17.14
26/11/2025	0	0.00	0.00000	0.00	0.00
27/11/2025	0	0.00	0.00000	0.00	0.00
28/11/2025	52,163	894,650.30	17.15110	17.08	17.30
Total	52,213	895,507.30	17.15104

Following this, the Company holds 6,536,762 own shares or 1.619% 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