Announcement of regulated information

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Hellenic Telecommunications Organization S.A. announced that its Chief Customer Operations Officer purchased 1,759 shares of the company on November 27, 2025, at an average price of €17.33 per share, totaling €30,483.47. This transaction was made under the "OTE Shares Award" Program and is being disclosed as regulated information in accordance with relevant EU and national laws concerning market abuse.

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Hellenic Telecomms Organization S A

02 December 2025

Announcement of Regulated Information

Αthens, December 02, 2025 - Hellenic Telecommunications Organization S.A. ("OTE" or the "Company") announces that in the context of ''OTE Shares Award'' Program, Mr. Athanasios Stratos, Chief Customer Operations Officer OTE Group - Chairman & CΕΟ Cosmote Evalue, Germanos, Cosmote Technical Services, according to his transaction notification to the Company dated 02.12.2025, purchased 1,759 shares of OTE (LEI ELPUFM0XZRZO4LFXW404), at an average price of €17.33 for a total value of €30,483.47 on 27.11.2025.

The announcement is issued as a Regulated Information, in accordance with Law 3556/2007, [article 3, par. 1 (p) and article 21] and Regulation No 596/2014 (article 19) of the European Parliament and of the Council on market abuse.

FOR FURTHER INFORMATION:

OTE GROUP INVESTOR RELATIONS

Tel. +30 210-6117364, +30 210-6332342

E-mail: iroffice@ote.gr

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