Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Nov 10, 2025

Announcement Purchase of Own Shares

Athens, November 10, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 03/11/2025 – 07/11/2025, it purchased 156,200 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 (€)
3/11/2025	4,260	69,395.84	16.29010	16.26	16.36
4/11/2025	21,838	353,315.30	16.17890	16.14	16.12
5/11/2025	16,631	272,146.52	16.36381	16.29	16.50
6/11/2025	44,058	719,625.92	16.33360	16.24	16.47
7/11/2025	69,413	1,132,640.75	16.31740	16.26	16.40
Total	156,200	2,547,124.33	16.30681

Following this, the Company holds 6,302,626 own shares or 1.561% 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