Comment regarding press speculation

Open Orphan plc

("Open Orphan" or the "Company")

Press Speculation

Open Orphan plc (AIM: ORPH), a rapidly growing specialist contract research organisation (CRO) and world leader in testing infectious and respiratory disease products using human challenge clinical trials, notes the media report relating to the allegation of an incident of potential insider dealing in the Company's shares by an unconnected private individual in 2020.

The Company confirms that it was made aware of this allegation by, and at their request, is helping the relevant Irish authorities in respect of this allegation.

The Board of Open Orphan is satisfied that there are no implications for the Company in the resolution of this allegation and confirms that no employee, executive, director or anyone connected with the Company had any involvement whatsoever in this matter nor are they suspected of any wrongdoing.

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Notes to Editors

Open Orphan plc (London and Euronext: ORPH) is a rapidly growing contract research company that is a world leader in testing infectious and respiratory disease products using human challenge clinical trials. The Company provides services to Big Pharma, biotech, and government/public health organisations.

The Company has a leading portfolio of human challenge study models for infectious and respiratory diseases, including the recently established COVID-19 model, and is developing a number of new models, such as Malaria, to address the dramatic growth of the global infectious disease market. The Paris and Breda offices have over 25 years of experience providing drug development services such as biometry, data management, statistics CMC, PK and medical writing to third party clients as well as supporting the London-based challenge studies.

hVIVO runs challenge studies in London from its Whitechapel quarantine clinic, its state-of-the-art QMB clinic with its highly specialised on-site virology and immunology laboratory, and its newly opened clinic in Plumbers Row. To recruit volunteers / patients for its studies, the Company leverages its unique clinical trial recruitment capacity via its FluCamp volunteer screening facilities in London and Manchester. The newly opened facilities have expanded the scope of the business to enable the offering of Phase I and Phase II vaccine field trials, PK studies, bridging studies, and patient trials as part of large international multi-centre studies.