Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Oct 27, 2025

Announcement Purchase of Own Shares

Athens, October 27, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 20/10/2025 – 24/10/2025, it purchased 243,098 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 (€)
20/10/2025	58,051	915,159.88	15.76476	15.63	15.87
21/10/2025	75,236	1,176,023.63	15.63113	15.54	15.81
22/10/2025	84,157	1,317,627.65	15.65678	15.56	15.87
23/10/2025	25,654	404,204.89	15.75602	15.64	15.91
24/10/2025			0
Σύνολο	243,098	3,813,016.05	15.68510

Following this, the Company holds 6,132,285 own shares or 1.518% 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