3 November 2025

Rockhopper Exploration plc

("Rockhopper" or the "Company")

Exercise of Options & Blocklisting Application

Rockhopper Exploration plc (AIM: RKH), the oil and gas company with key interests in the North Falkland Basin, announces that it has issued a total of 1,000,000 ordinary shares in the capital of the Company (the "New Ordinary Shares") pursuant to the exercise of share options by an employee. The New Ordinary Shares were issued during October 2025 under the Company's existing blocklisting entitlement.

Total Voting Rights

In conformity with the Financial Conduct Authority's Disclosure and Transparency Rules, the Company confirms that, as at 31 October 2025, the issued ordinary share capital of the Company consists of 646,213,765 ordinary shares of 1 pence each with voting rights attached (one vote per ordinary share). The Company does not hold any shares in Treasury at the date of this disclosure. The issued share capital figure can be used by shareholders as the denominator for the calculations by which to determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure and Transparency Rules.

Blocklisting Application

The Company also announces that it has made an application to the London Stock Exchange for a blocklisting of 17,079,589 ordinary shares in the capital of the Company (the "New Blocklisting Shares"). It is expected that admission will become effective on or around 6 November 2025. The New Blocklisting Shares will be used to provide additional headroom to satisfy the issue of shares pursuant to the exercise of options under the Rockhopper Exploration plc Long Term Incentive Plan 2013 and the Rockhopper Exploration plc Share Option Plan 2020 (collectively the "Employee Share Schemes"). The New Blocklisting Shares will be credited as fully paid and will rank pari passu in all respects with the existing ordinary shares.

Enquiries:

Rockhopper Exploration plc

Jan Davies, Company Secretary

Tel. +44 (0)20 7390 0234 (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