Onxeo's Joint General Meeting in Camera on May 29, 2020

Availability of Preparatory Documents and Live Webcast Login Information

Regulatory News:

Onxeo S.A. (Euronext Paris, NASDAQ Copenhagen: ONXEO - FR0010095596), (“Onxeo”, “the Company” or “the Group”), a clinical-stage biotechnology company specializing in the development of innovative drugs targeting tumor DNA Damage response (DDR) in oncology, in particular against rare or resistant cancers, announces today the availability of the preparatory documents for its joint general meeting of May 29, 2020 and specifies the live webcast login information.

As indicated in the press release of April 27, 2020, the Joint General Meeting on May 29, 2020 at 10:00 a.m., will be held in camera, without the presence of shareholders or other persons usually eligible to attend, pursuant to the provisions of Order no. 2020-321 of March 25, 2020.

The General Meeting will be webcasted live (in French) via a web conferencing system, and shareholders of Onxeo are invited to login through the following link:

https://onlinexperiences.com/scripts/Server.nxp?LASCmd=AI:4;F:QS!10100 ...

• This link allows shareholders to pre-register for the General Meeting by indicating your name, first name and e-mail. They will then receive a confirmation of their registration with the possibility to add the event to their agenda.
• On May 29, 2020, they will be able to log on to this same link from 9:45 am. The meeting will start at 10:00 am sharp and they will be able to follow the presentation commented by the management of Onxeo directly on their computer.
• At any time during the presentation, they will be able to send their questions via the web platform. Questions will be answered during the Q&A session.

In accordance with current regulations and the recent recommendations of the French stock-market authority (AMF), Onxeo shareholders are requested to cast their votes exclusively through mail or online voting prior to the General Meeting:

- online voting is available and must be used as a priority: the secure voting platforms VOTACCESS in France and Computershare in Denmark will be active as of this morning at 9 a.m.

- alternatively, shareholders can also vote by postal ballot, in accordance with the terms and conditions indicated in the prior notice published in the BALO on April 24, 2020.

The voting procedure is detailed in the Shareholder handbook available through the following links:

• procedure for shares traded on Euronext Paris;
• procedure for shares traded on Nasdaq Copenhagen;

All documents relating to this General Meeting are available on the company's website, in the General Meetings section.