Intention to Appoint Administrators and Suspension

THE INFORMATION CONTAINED WITHIN THIS ANNOUNCEMENT IS DEEMED BY THE COMPANY TO CONSTITUTE INSIDE INFORMATION STIPULATED UNDER THE MARKET ABUSE REGULATION (EU) NO. 596/2014 ("MAR") AND THE RETAINED UK LAW VERSION OF MAR PURSUANT TO THE MARKET ABUSE (AMENDMENT) (EU EXIT) REGULATIONS 2019 (SI 2019/310) ("UK MAR"). UPON THE PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INSIDE INFORMATION IS NOW CONSIDERED TO BE IN THE PUBLIC DOMAIN.

Oncimmune Holdings plc

("Oncimmune" or the "Company", together with its subsidiary "the Group")

Intention to Appoint Administrators and Suspension of Trading

Oncimmune Holdings plc (AIM: ONC.L) today announces, further to the announcement made on 24 February 2025, that despite a comprehensive sale process and positive interest in the business it has unfortunately not been possible to secure a buyer for the Company's trading subsidiary, Oncimmune Germany GmbH. It has also not been possible to raise the additional capital required to meet the Company's short term funding needs.

In light of this, and after extensive consideration of the Company's current financial situation as well as the resulting creditor position, the Board has regrettably concluded that there are no further options available to the Company to extend its cash runway and that the Group should therefore be placed into administration in order to preserve the value of the business for creditors. Accordingly, a notice will be filed with the Court today notifying the directors' intention to appoint Managing Directors from Alvarez & Marsal Europe LLP as administrators of the Company as soon as reasonably practicable.

Consequently, the Company has requested a suspension in the trading of its ordinary shares on AIM, which will become effective from 7.30am on 17 March 2025.

Further announcements will be made in due course.

For further information:

Contact Alvarez & Marsal : [email protected]

[email protected]

Cavendish Capital Markets Limited (Nominated Adviser and Joint Broker)

Geoff Nash, Callum Davidson, Trisyia Jamaludin (Corporate Finance)

Nigel Birks (Life Science Specialist Sales)

Ondraya Swanson (Corporate Broking) +44 (0) 20 7220 0500

Zeus (Joint Broker)

Dominic King +44 (0)20 3829 5000

About Oncimmune

Oncimmune is a precision medicine company, specialising in analysing immune interactions through the autoantibody profile. Taking a platform approach to generating insights, Oncimmune is partnering with global pharmaceutical and biotech companies, as well as contract research organisations (CROs) to discover novel biomarkers for the development of more targeted and effective therapies across many immune-mediated diseases. Our mission at Oncimmune is to enable precision medicine. We help our partners to discover novel biomarkers, drug targets and predict treatment efficacy through the application of our platform. We are able to do this by deploying our world class scientific team and our cutting-edge technology platform, built on years of experience in the field. Our aim is to make this an essential tool in drug discovery and development.

Oncimmune is headquartered in the UK, with its discovery and development facility based in Dortmund, Germany and a business development team based in the US and Europe.

For more information, visit www.oncimmune.com