20 January 2026

Rockhopper Exploration plc
("Rockhopper" or the "Company")

Appointment of Non-Executive Director

Rockhopper Exploration plc (AIM: RKH), the oil and gas company with key interests in the North Falkland Basin, is pleased to announce the appointment of Richard Slape to the Board as a Non-Executive Director, with immediate effect.

Richard will join the Remuneration, Nomination and Audit and Risk Committees. Alison Baker, Senior Independent Director, will retire from the Board at the next Annual General Meeting, currently anticipated to be in June 2026, and Richard will at that point take on the role of chair of the Audit and Risk Committee, currently led by Alison. Paul Mayland will assume Alison's position as Senior Independent Director.

Richard has extensive board level experience within the energy sector and was also an oil and gas analyst for over 25 years prior to moving into corporate roles within the industry. He has fulfilled a number of senior executive roles including Chief Financial Officer of Kistos Holdings (and its predecessor) from 2021 to 2024. Prior to joining Kistos, he was the Chief Financial Officer of RockRose Energy and he has also served on the board of Lansdowne Oil & Gas.

Simon Thomson, Chairman of Rockhopper Exploration, commented:

"We are delighted to welcome Richard, a hugely experienced industry figure, to the Board at such an exciting time for the Company and with the development of Sea Lion now under way following its recent sanction. Richard has assisted Rockhopper previously so knows the business extremely well, meaning we will be able to fully benefit from his insights and contributions quickly. I would also like to thank Alison for her unstinting support and contribution to the Company's progress in her time on the Board and wish her the very best for her future endeavours. I am very pleased she was able to see the sanction of Sea Lion achieved during her tenure."

Further information on Richard Slape's appointment:

The following details in relation to the appointment of Richard Slape is disclosed in accordance with AIM Rule 17 and Schedule 2(g) of the AIM Rules:

Richard Slape (aged 60) has held the following directorships and/or partnerships in the past five years.

There is no further information to be disclosed in relation to Richard Slape's appointments pursuant to AIM Rule 17 or Schedule Two, paragraph (g) (i)-(viii) of the AIM Rules for Companies.

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Enquiries:

Rockhopper Exploration plc
Sam Moody - Chief Executive Officer
Tel. +44 (0)20 7390 0230 (via Vigo Consulting)

Canaccord Genuity Limited (NOMAD and Joint Broker)

Henry Fitzgerald-O'Connor/James Asensio/Charlie Hammond

Tel. +44 (0) 20 7523 8000

Peel Hunt LLP (Joint Broker)

Richard Crichton/Georgia Langoulant

Tel. +44 (0) 20 7418 8900

Vigo Consulting

Patrick d'Ancona/Ben Simons/Fiona Hetherington

Tel. +44 (0) 20 7390 0234

Notes to Editors

Rockhopper Exploration plc is a UK-based oil and gas exploration and production company with key interests in the Falkland Islands. The Company holds a 35% interest in licences in the North Falkland Basin, where it has sanctioned the development of the significant Sea Lion field which was originally discovered by the Company in 2010.

Rockhopper's shares are quoted on the AIM market of the London Stock Exchange under the ticker RKH.

For more information, visit the Company's website at www.rockhopperexploration.co.uk.