Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Sep 8, 2025

Announcement Purchase of Own Shares

Athens, September 08, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 01/09/2025 – 05/09/2025, it purchased 247,946 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 (€)
1/9/2025	73,446	1,177,992.07	16.03890	15.93	16.07
2/9/2025	61,500	983,617.40	15.99380	15.86	16.06
3/9/2025	46,000	738,823.11	16.06140	15.87	16.12
4/9/2025	32,000	516,219.28	16.13190	16.04	16.15
5/9/2025	35,000	565,028.95	16.14370	16.10	16.21
Total	247,946	3,981,680.81	16.05866

Following this, the Company holds 4,258,935 own shares or 1.055% 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