22 June 2026

Fusion Antibodies plc

("Fusion" or the "Company")

Notice of allowance of patent in Canada

Fusion Antibodies plc (AIM: FAB), specialists in pre-clinical antibody discovery, engineering and supply for both therapeutic drug and diagnostic applications, announces that the Canadian Intellectual Property Office has issued a notice of allowance in respect of the Company's Canadian patent application no. 3,115,150 (the "Patent Application").

The Patent Application entitled "Antibody Library and Method", covers two families of antibodies, and the method for the design of such antibody libraries. The patent, once granted, is expected to be complementary to Fusion's offering to provide "Opti" designed antibody libraries for a range of applications including: Antibody Discovery; Affinity Maturation; and Sequence Optimisation.

The Company is also progressing additional patent applications in respect of the OptiMAL® Library in Canada and several other territories worldwide including Europe and China.

Receipt of a notice of allowance indicates that the claims in the Patent Application are patentable and does not in itself represent a grant of patent rights. Fusion anticipates that the patent will be granted upon completion of certain administrative requirements, including payment of the Patent Application, in due course.

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About Fusion Antibodies plc

Fusion is a Belfast based contract research organisation ("CRO") providing a range of antibody engineering services for the development of antibodies for both therapeutic drug and diagnostic applications.

The Company's ordinary shares were admitted to trading on AIM on 18 December 2017. Fusion provides a broad range of services in antibody generation, development, production, characterisation and optimisation. These services include antigen expression, antibody production, purification and sequencing, antibody humanisation using Fusion's proprietary CDRx ^TM platform and the production of antibody generating stable cell lines to provide material for use in clinical trials. Since 2012, the Company has successfully sequenced and/or expressed over 750 antibodies and successfully completed over 250 humanisation projects and has an international, blue-chip client base, which has included eight of the top 10 global pharmaceutical companies by revenue.

The Company was established in 2001 as a spin out from Queen's University Belfast. The Company's mission is to enable pharmaceutical and diagnostic companies to develop innovative products in a timely and cost-effective manner for the benefit of the global healthcare industry. Fusion Antibodies provides a broad range of services in antibody generation, development, production, characterisation and optimisation.

Fusion Antibodies growth strategy is based on combining the latest technological advances with cutting edge science to deliver new platforms that will enable Pharma and Biotech companies get to the clinic faster, with the optimal drug candidate and ultimately speed up the drug development process.