Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Jan 5, 2026

Announcement Purchase of Own Shares

Athens, January 5, 2026 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 29/12/2025 – 02/01/2026, it purchased 120,420 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 (€)
29/12/2025	13,995	236,501.44	16.89900	16.82	16.94
30/12/2025	34,074	576,377.46	16.91546	16.80	16.96
31/12/2025	40,279	679,094.26	16.85976	16.76	16.95
2/1/2026	32,072	541,931.80	16.89735	16.86	16.94
Total	120,420	2,033,904.96	16.89009

Following this, the Company holds 7,581,474 own shares or 1.877% 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

E-mail: iroffice@ote.gr