Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Nov 24, 2025

Announcement Purchase of Own Shares

Athens, November 24, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 17/11/2025 – 21/11/2025, it purchased 96,451 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 (€)
17/11/2025	2,341	39,148.11	16.72280	16.64	16.89
18/11/2025	26,235	437,688.49	16.68338	16.64	16.72
19/11/2025	46,173	770,868.89	16.69520	16.66	16.81
20/11/2025	9,310	155,765.08	16.73090	16.69	16.77
21/11/2025	12,392	208,970.52	16.86330	16.80	16.91
Total	96,451	1,612,441.09	16.71772

Following this, the Company holds 6,484,549 own shares or 1.606% 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