Appointment of Non-Executive Chair

hVIVO plc (AIM: HVO), a full-service Contract Research Organisation (CRO) and the world leader in human challenge clinical trials, confirms that, further to its announcement on 29 July 2025, Shaun Chilton has today joined the Board of Directors as Non-Executive Chair with immediate effect.

Shaun brings substantial sector-relevant experience and expertise to the Board, underpinned by a track record of delivering strong growth in sales and enterprise value. He brings over 30 years of experience leading and managing both private and public businesses. Shaun was previously Chief Executive Officer of Clinigen Group plc, a global pharmaceutical services group operating in more than 100 countries and has considerable board experience within UK public companies. He is currently Non-Executive Chair of Avacta Group plc, Non-Executive Chair of Kintiga Limited, and Independent Supervisory Board Member of Product Life Group.

Elaine Sullivan, Interim Chair & Senior Non-Executive Director of hVIVO plc, said: "We are delighted to welcome Shaun to the Board of hVIVO. Shaun brings a wealth of sector-relevant experience and we believe his expertise will support us as we continue to grow and diversify the Group. As a Board we look forward to working closely with Shaun to help deliver on the Company's mission and execute on our strategy."

Shaun Chilton, incoming Non-Executive Chair of hVIVO plc, said: "I am pleased to join the Board of hVIVO plc, a Company which I believe has excellent prospects as it continues to diversify its service offering while leading the global charge in delivering exceptional human challenge trial services to its clients."

Additional Information on the Board Appointment

The following additional information is provided with regards to the appointment of Shaun Edward Chilton, aged 57, in accordance with Rule 17 and Schedule 2(g) of the AIM Rules for Companies:

Clinigen Healthcare Limited

Clinigen Holdings Limited

Clinigen International Holdings Limited

Clinigen Limited

Clinigen Pharma Limited

Definigen Limited

IDIS GA Limited

IDIS Group Holdings Limited

IDIS Group Limited IDIS Limited

IDIS MA Limited

IDIS Pharma Limited

Iovance Biotherapeutics UK SP Ltd

Keats Healthcare Limited

Shaun does not hold any shares or options in the Company.