Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Oct 20, 2025

Announcement Purchase of Own Shares

Athens, October 20, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 13/10/2025 – 17/10/2025, it purchased 326,562 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 (€)
13/10/2025	31,147	500,693.79	16.07519	15.97	16.21
14/10/2025	58,021	926,276.53	15.96451	15.79	16.08
15/10/2025	76,744	1,214,244.39	15.82201	15.71	15.95
16/10/2025	74,525	1,175,330.76	15.77096	15.63	15.95
17/10/2025	86,125	1,344,807.17	15.61460	15.43	15.74
Total	326,562	5,161,352.64	15.80512

Following this, the Company holds 5,889,187 own shares or 1.458% 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