hVIVO plc

("hVIVO" or the "Company")

Exercise of Options

hVIVO plc (AIM: HVO) (formerly Open Orphan plc), a rapidly growing specialist contract research organisation (CRO) and world leader in testing infectious and respiratory disease products using human challenge clinical trials, confirms that it has issued 7,716,964 new ordinary shares of 0.1 pence each in the capital of the Company ("Ordinary Shares"), pursuant to the exercise of share options by a former employee of the Company. It is expected that the admission of the Ordinary Shares will occur on 28 March 2023.

Following admission, the Company will have 678,764,735 Ordinary Shares in issue. This figure of 678,764,735 may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change of their interest in, the Company under the FCA's Disclosure and Transparency Rules.

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Notes to Editors

hVIVO plc (ticker: HVO) (formerly Open Orphan plc) is a rapidly growing specialist contract research organisation (CRO) and the world leader in testing infectious and respiratory disease vaccines and therapeutics using human challenge clinical trials. The Group provides end-to-end early clinical development services to its large, established and growing repeat client base, which includes four of the top 10 largest global biopharma companies.

The Group's fast-growing services business includes a unique portfolio of 11 human challenge models, with a number of new models under development, to test a broad range of infectious and respiratory disease products, world class challenge agent manufacturing, specialist drug development and clinical consultancy services via its Venn Life Sciences brand, and a lab offering via its hLAB brand, which includes virology, immunology biomarker and molecular testing. The Group offers additional clinical field trial services such as patient recruitment and clinical trial site services.

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 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.