Αthens, May 25, 2018 – Hellenic Telecommunications Organization S.A. (“OTE S.A.” or the “Company”) announces that, Mr. Tabourlos Panagiotis, independent non-executive member of the Board of Directors, according to his transaction notification towards the Company dated 25/05/2018, proceeded with the below transactions:

• Bought on 22/05/2018, 86 shares of OTE S.A. for a total value of €929.66
• Bought on 23/05/2018, 1,500 shares of OTE S.A. for a total value of €16,182.33
• Bought on 24/05/2018, 1,414 shares of OTE S.A. for a total value of €15,356.04

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