HELLENIC TELECOM ORGANIZATION S A : Revision of Financial Calendar 2017

ANNOUNCEMENT

Athens, April 13, 2017 - The Hellenic Telecommunications Organization S.A. (OTE S.A. or Company), releases, its 2017 Financial Calendar, pursuant to paragraphs 4.1.2.1.(b) and 4.1.4.3.1 of the Athens Stock Exchange Regulation, according to which:

1. Announcement on the Company's website (https://www.cosmote.gr/fixed/corporate/ir) and on the website of the Athens Stock Exchange of the Annual Stand Alone and Consolidated Financial Statements for the fiscal year 2016, in accordance with the I.F.R.S, together with the table with the financial data and information deriving from said Financial Statements: Thursday, March 2, 2017 /Press Release: Friday, March 3rd 2017.

2. The analysts briefing on the full year 2016 financial results: Thursday, March 2, 2017.

3. Ordinary General Meeting of the Company's Shareholders: Tuesday, June 20, 2017 at OTE

   S.A. headquarters, 99 Kifissias Av., Maroussi, Athens.

4. Ex-dividend date: Friday, July 7, 2017. On that date, Company shares will be trading without a dividend right for the year 2016. The ex-dividend date follows the expiry of derivatives (June series).

5. Beneficiaries of said dividend are the Company's Shareholders registered on Monday, July 10, 2017 (Record Date).

6. Dividend payment (starting date): Friday, July 14 2017.

It is noted that: (i) the Company retains the right to alter the above dates after duly advising the investing public of the amendment hereof and (ii) the Ordinary General Meeting of the Company's Shareholders is entitled to resolve differently on the above matters, according to the applicable legislation and Athens Stock Exchange Regulation.

The OTE Group is the largest telecommunications provider in the Greek market and one of the leading telecom groups in Southeast Europe with presence in Greece, Romania and Albania. OTE is among the largest listed companies, with respect to market capitalization, in the Athens Stock Exchange.

OTE Group offers the full range of telecommunications services: from fixed-line and mobile telephony, broadband services, to pay television and ICT solutions. In addition to its core telecommunications activities, the Group is also involved in maritime communications, real-estate and professional training.

Additional Information is also available on https://www.cosmote.gr.

FOR FURTHER INFORMATION: OTE GROUP INVESTOR RELATIONS Τel. +30 210-6111574

E-mail: iroffice@ote.gr Fax: +30 210-6111030