Hellenic Telecommunications Organization S.A.

Transaction in Own Shares • Jul 25, 2025

Announcement Purchase of Own Shares

Athens, July 25, 2025 – Hellenic Telecommunications Organization S.A, ("OTE" or the "Company"), announces that, during 21/07/2025 – 25/07/2025, it purchased 221,497 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 (€)
21/7/2025	22,300	345,218.13	15.48060	15.41	15.53
22/7/2025	106,000	1,617,813.48	15.26240	15.20	15.38
23/7/2025	29,000	446,180.00	15.38550	15.32	15.42
24/7/2025	30,000	462,451.00	15.41500	15.38	15.46
25/7/2025	34,197	527,326.32	15.42030	15.22	15.48
Total	221,497	3,398,988.93	15.34553

Following this, the Company holds 3,364,849 own shares or 0.833% 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