Αthens, May 15, 2018 – Hellenic Telecommunications Organization S.A. (“OTE S.A.” or the “Company”) announces that, Mr. Konstantinos Christopoulos, vice chairman, independent non-executive member of the Board of Directors, according to his transaction notification towards the Company dated 14/05/2018, sold on 14/05/2018, debt securities of face value €100,000.00 of OTE plc.(ISIN: XS1086785182, maturity date July 9, 2020) for a total value of €105,420.00.

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.