4 September 2026

Rockhopper Exploration plc

("Rockhopper")

Sea Lion Operator Update following Media Reports

Rockhopper (AIM: RKH), the oil and gas company with key interests in the North Falkland Basin, notes media reporting regarding the Falkland Islands and also notes the announcement made today by its partner and Sea Lion project operator Navitas Petroleum ("Navitas") which is extracted below:

'Further to reports in the media, including in connection with the speech delivered overnight by the President of Argentina, Javier Milei, regarding Argentina's position on the Falkland Islands and the Sea Lion Project, the Partnership hereby clarifies the following update:

The Partnership operates pursuant to valid petroleum licenses lawfully granted to it by the Government of the Falkland Islands, a self-governing UK Overseas Territory, and with the full and ongoing support of the UK Government. For further details, see also Sections 8.2, 8.13 and 8.15 of the Partnership's 2025 Annual Report, published on March 18, 2026 (reference no. 2026-01-023779).

The Partnership believes that the recent developments are not expected to have a material effect on the development activities of the Sea Lion Project, including the timetable for completion of the Project's development. For further details, see the Board of Directors' Report included in the Partnership's report for the second quarter of 2026, published on August 24, 2026 (reference no. 2026-01-079056).'

The full announcement by Navitas can be found here: NAVITAS PETRO- Response regarding publications regarding the Sea-Lion project | MAYA - TASE Site

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 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.