Hellenic Telecommunications Organization S.A.

Notice of Dividend Amount • Oct 14, 2025

Announcement Write-off of the Unclaimed dividend of financial year 2019

Athens, October 14, 2025 – Hellenic Telecommunications Organization S.A. ("OTE S.A." or the "Company"), informs investors and its shareholders that the five-year deadline for the collection of the fiscal year 2019 dividend, expires on 31/12/2025. After this date, the total amount of any unclaimed dividends will be assigned to the Greek State.

Shareholders that have not yet collected the dividend for fiscal year 2019 may do so through any Piraeus Bank branch until 31/12/2025, upon display of their Identity Card or Passport. The dividend may also be collected until this date on behalf of the shareholders by a proxy, upon display of a power of attorney and their identification, according to the above. Following this date, shareholders will no longer be entitled to receive the 2019 dividend amount.

For any further information or related enquiries, shareholders may contact the OTE Group Investor Relations.

FOR FURTHER INFORMATION OTEGROUP INVESTOR RELATIONS Tel. +30 210 6115381, +30 210 6117364, +30 210 6332342

E-mail: iroffice@ote.gr