Hellenic Telecommunications Organization S.A.

Report Publication Announcement • Oct 10, 2025

Announcement

OTE Group Q3 2025 Financial results to be released on November 13th, 2025

ATHENS, Greece – October 10, 2025 – Hellenic Telecommunications Organization SA (ASE: HTO, OTC MARKET: HLTOY), announces that it will release its Q3 and 9M 2025 financial results on Thursday, November 13, 2025, before the opening of the Athens Exchange.

OTE's management will host a conference call to review the results on the same date at 13:00 (GREECE) / 12:00 (CONTINENT) / 11:00 (UK) / 06:00 (EASTERN US).

Please find below details regarding the conference call dial-in and replay numbers as well as the live audio webcast:

Conference Call Details

Date: Thursday, 13th November 2025

Time: 13:00 Athens Time (C.E.T. +1)

Conference Phone GR +30 210 9460 800

Conference Phone DE +49 (0) 69 2222 4493

Conference Phone UK & Intl +44 (0) 203 059 5872

Conference Phone USA +1 516 447 5632

We recommend that you call any of the above numbers 5 to 10 minutes before the conference call is scheduled to start.

Webcast Details

To participate via webcast you may join by linking at the internet site: https://87399.themediaframe.eu/links/otegroup251113.html

If you experience any difficulty please call + 30 210 9460803

Digital Playback Details

A digital playback of the conference call will be available approximately one hour after the end of the conference call until end of business day of 15^th December 2025.

If you are interested to listen to the play back, please dial one of the following

Playback Phone GR +30 210 9460 929

Playback Phone UK +44 (0) 203 0595874

Playback Phone US +1 631 257 0626

The playback conference call number is: 808#

FOR FURTHER INFORMATION

OTE GROUP INVESTOR RELATIONS Tel. +30 210-6117364, +30 210-6332342 +30 210-6118190

E-mail: iroffice@ote.gr