ORPH.L Regulatory News (ORPH)

Open Orphan plc

("Open Orphan" or the "Company")

CEO share purchase

Open Orphan plc (AIM: ORPH), (to be renamed hVIVO plc (AIM: HVO) effective 26 October 2022), a rapidly growing specialist contract research organisation (CRO) and world leader in testing infectious and respiratory disease products using human challenge clinical trials, announces that it has received notification that on 29 September 2022, Yamin 'Mo' Khan, Chief Executive Officer of the Company, purchased 510,204 ordinary shares of 0.1 pence each in the capital of the Company ("Shares") at a price of 9.8 pence per Share. Following the purchase of shares Mo holds 510,204 ordinary shares representing approximately 0.08 per cent of the Company's issued ordinary capital.

Yamin 'Mo' Khan, Chief Executive Officer of Open Orphan plc, said: "The purchase of shares in the Company demonstrates both my commitment and my confidence in our long-term growth strategy. Since my appointment as CEO in February 2022, we have made significant progress, delivering continued growth and a record orderbook valued at c.£80m as of 1 September, which provides excellent forward visibility into H2 2022 and 2023."

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 (as implemented into English law) ("MAR"). With the publication of this announcement via a Regulatory Information Service, this inside information is now considered to be in the public domain.

For further information please contact:

Notes to Editors

Open Orphan plc (London and Euronext: ORPH) is changing its name to hVIVO plc (AIM and Euronext: HVO), which is expected to take effect on the AIM market of the London Stock Exchange and the Euronext Growth Exchange market on 26 October 2022.

hVIVO 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 and is developing a number of new models, such as malaria and COVID-19, 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.

Notification of transactions by Directors, Persons Discharging Managerial Responsibilities ("PDMRs") and persons closely associated with them.