Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Nov 3, 2025

Announcement Purchase of Own Shares

Athens, November 3, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 27/10/2025 – 31/10/2025, it purchased 14,141 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 (€)
27/10/2025	9,539	152,104.06	15.94549	15.90	16.01
29/10/2025	0	0	0	0	0
30/10/2025	0	0	0	0	0
31/10/2025	4,602	74,734.86	16.23965	16.23	16.27
Total	14,141	226,838.92	16.04122

Following this, the Company holds 6,146,426 own shares or 1.522% 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