Posting of Annual Report & Notice of AGM

5 June 2026

Rockhopper Exploration plc

("Rockhopper", the "Group" or the "Company")

Posting of Annual Report

&

Notice of Annual General Meeting

Further to the announcement of the Company's results for the year ended 31 December 2025 on 3 June 2026, Rockhopper (AIM: RKH) confirms that the Annual Report and Accounts for the year ended 31 December 2025 will be available from 12.00 p.m. today on the Company's website. Hard copies will be posted to those shareholders who elected to receive them, together with documentation for the 2026 Annual General Meeting ("AGM").

The AGM is scheduled to be held at 10.00 a.m. on Tuesday, 30 June 2026 at The Clubhouse, Skew Bridge, Wilton Road, Salisbury, Wiltshire SP2 9NY.

The AGM Notice includes resolutions relating to the proposed election of two new directors to the Board to reflect the new phase of Rockhopper's development having taken FID at Sea Lion and the increasingly international nature of the shareholder register.

William Perry will, subject to approval of shareholders at the AGM, join the Board as Chief Financial Officer ("CFO"). William has been performing the role of CFO in a non-Board capacity since 2021. A Chartered Accountant, he started working with Rockhopper in 2010 before joining full time in 2011. He joined from Smith & Williamson where he was a senior manager with a portfolio of clients from a range of industries including those in the oil and gas sector. Relevant disclosures under AIM Rule 17 and Schedule 2(g) of the AIM Rules for Companies are provided below.

Barak Mashraki will, subject to approval of shareholders at the AGM, join the Board as an Independent Non-Executive Director. Barak is an experienced energy, finance, and capital markets executive with over two decades of leadership experience in the oil and gas industry, including large-scale energy investments and strategic development initiatives. He served as Chief Financial Officer of Delek Group, one of Israel's leading energy groups, from 2008 to 2020, and most recently as Chief Executive Officer of Tel Aviv-listed Tamar Petroleum until early 2026. He brings extensive relationships across the Israeli institutional investor and capital markets community. He currently serves as a Board advisor to Ratio Petroleum.

As Barak Mashraki is not a UK citizen, his appointment is subject to additional due diligence which is currently ongoing. Subject to approval by shareholders at the AGM, confirmation of his appointment and relevant disclosures under AIM Rule 17 and Schedule 2(g) of the AIM Rules for Companies will be provided on completion of the AGM.

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

Disclosures under Rule 17 / Schedule 2(g) of the AIM Rules for Companies

Mr William Rees Perry (aged 49 years old) holds or has held the following directorships or partnerships in the past five years:

Mr Perry holds the following interest in the Company:

No further disclosures on William Perry are required under AIM Rule 17 or Schedule 2(g) of the AIM Rules for Companies.

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 per cent interest in licences in the North Falkland Basin, where it has sanctioned the development of the significant Sea Lion field, 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.