THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN, IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION, DISTRIBUTION OR FORWARDING, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES, AUSTRALIA, CANADA, JAPAN, THE REPUBLIC OF SOUTH AFRICA OR ANY OTHER JURISDICTION IN WHICH SUCH RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

THIS ANNOUNCEMENT IS FOR INFORMATION PURPOSES ONLY AND IS NOT AN OFFER OF SECURITIES IN ANY JURISDICTION.

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF ARTICLE 7 OF THE MARKET ABUSE REGULATIONS (EU) NO. 596/2014 WHICH FORMS PART OF DOMESTIC UK LAW PURSUANT TO THE EUROPEAN UNION (WITHDRAWAL) ACT 2018 ("UK MAR").

16 January 2026

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

Results of Open Offer and Total Voting Rights

Rockhopper Exploration plc (AIM: RKH), the oil and gas company with key interests in the North Falkland Basin, announces the results of its Open Offer to Qualifying Shareholders announced on 22 December 2025 which, in accordance with its terms, closed for acceptances at 11.00 a.m. on 15 January 2026. 

The Company is pleased to announce that valid acceptances were received from Qualifying Shareholders for a total of 101,956,821 Open Offer Shares under the Open Offer, representing a take-up of approximately 773.1% per cent. of the 13,188,036 Open Offer Shares available under the Open Offer.

Qualifying Shareholders who have validly applied for Open Offer Shares will receive their full basic entitlement. Applications for New Ordinary Shares under the Excess Application Facility have been scaled back on a pro rata basis, in accordance with the terms of the Open Offer as outlined in the Circular.

Accordingly, the Open Offer has raised total gross proceeds of approximately £6.9 million (approximately US$9.2 million) through the issue of a total of 13,188,036 Open Offer Shares.

Admission and dealings

The Open Offer Shares will, when issued, be credited as fully paid and will rank pari passu in all respects with each other and with the Existing Ordinary Shares, including the right to receive all dividends and other distributions declared, made or paid after the date of Admission. Application has been made to the London Stock Exchange for the Open Offer Shares to be admitted to trading on AIM ("Admission"). Dealings in the Open Offer Shares and Admission are expected to take place on or around 8.00 a.m. on 21 January 2026.

Total voting rights

The Company confirms that, upon Admission of the Open Offer Shares, which is expected to occur on 21 January 2026, the issued ordinary share capital of the Company will consist of 860,504,777 Ordinary Shares of 1 pence each with voting rights attached and there will be no Ordinary Shares held in treasury. This issued share capital figure can be used by Shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FCA's Disclosure Guidance and Transparency Rules.

Sam Moody, Chief Executive Officer of Rockhopper Exploration, commented:

"I am delighted that the Open Offer has been a success and was significantly oversubscribed, reflecting strong shareholder support at an exciting time for Rockhopper. We thank all our shareholders for their continued interest and look forward to progressing the Sea Lion development with partner and operator Navitas."

Unless otherwise defined, capitalised terms have the same meaning as in the Company's circular published in connection with the Open Offer on 29 December 2025.

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.

IMPORTANT NOTICES

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under Article 7 of the Market Abuse Regulation (EU) No. 596/2014 (as amended) as it forms part of the domestic law of the United Kingdom by virtue of the European Union (Withdrawal) Act 2018 (as amended). Upon the publication of this announcement via the Regulatory Information Service, this inside information is now considered to be in the public domain.

This announcement contains (or may contain) certain forward-looking statements with respect to certain of the Company's plans and its current goals and expectations relating to its future financial condition and performance and which involve a number of risks and uncertainties. The Company cautions readers that no forward-looking statement is a guarantee of future performance and that actual results could differ materially from those contained in the forward-looking statements. These forward-looking statements can be identified by the fact that they do not relate only to historical or current facts. Forward-looking statements sometimes use words such as "aim", "anticipate", "target", "expect", "estimate", "intend", "plan", "goal", "believe", or other words of similar meaning. By their nature, forward-looking statements involve risk and uncertainty because they relate to future events and circumstances, including, but not limited to, economic and business conditions, the effects of continued volatility in credit markets, market-related risks such as changes in the price of commodities or changes in interest rates and foreign exchange rates, the policies and actions of governmental and regulatory authorities, changes in legislation, the further development of standards and interpretations under International Financial Reporting Standards ("IFRS") applicable to past, current and future periods, evolving practices with regard to the interpretation and application of standards under IFRS, the outcome of pending and future litigation or regulatory investigations, the success of future explorations, acquisitions and other strategic transactions and the impact of competition. A number of these factors are beyond the Company's control. As a result, the Company's actual future results may differ materially from the plans, goals, and expectations set forth in the Company's forward-looking statements. You should not place undue reliance on forward-looking statements. Any forward-looking statements made in this announcement by or on behalf of the Company speak only as of the date they are made. Except as required by the FCA, the London Stock Exchange or applicable law, the Company expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained in this announcement to reflect any changes in the Company's expectations with regard thereto or any changes in events, conditions or circumstances on which any such statement is based.

This announcement is for information purposes only and shall not constitute an offer to buy, sell, issue, or subscribe for, or the solicitation of an offer to buy, sell, issue, or subscribe for any securities, nor shall there be any offer, solicitation or sale of securities in any jurisdiction in which such offer, solicitation or sale would be unauthorised or unlawful prior to registration or qualification under the securities laws of any such jurisdiction. Any failure to comply with these restrictions may constitute a violation of the securities law of any such jurisdiction.

This announcement is not an offer of securities for sale in or into the United States. The New Ordinary Shares have not been and will not be registered under the US Securities Act 1933, as amended (the "Securities Act") or with any securities regulatory authority of any state or other jurisdiction of the United States and may not be offered, sold, delivered, transferred, or taken up, directly or indirectly, in or into the United States except pursuant to an exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in compliance with any applicable securities laws of any state or other jurisdiction of the United States. The Company does not intend to register any portion of the Open Offer in the United States or to conduct an offering of securities in the United States. The New Ordinary Shares are being offered and sold in "offshore transactions" as defined in, and in reliance on, Regulation S under the Securities Act.

This announcement does not contain an offer or constitute any part of an offer to the public within the meaning of Sections 85 and 102B of the FSMA or otherwise. This announcement is not an "approved prospectus" within the meaning of Section 85(7) of the FSMA and a copy of it has not been, and will not be, delivered to the FCA in accordance with the Prospectus Regulation Rules or delivered to any other authority which could be a competent authority for the purpose of the Prospectus Regulation (EU) 2017/1129 (the "EU Prospectus Regulation") or the UK version of Prospectus Regulation (EU) 2017/1129 as it forms part of retained EU law by virtue of the European Union (Withdrawal) Act 2018, as amended (the "UK Prospectus Regulation"). Its contents have not been examined or approved by the London Stock Exchange, nor has it been approved by an "authorised person" for the purposes of Section 21 of the FSMA. This announcement is being distributed to persons in the United Kingdom only in circumstances in which section 21(1) of the FSMA does not apply.

This announcement has been issued by and is the sole responsibility of the Company. No representation or warranty, express or implied, is or will be made as to, or in relation to, and no responsibility or liability is or will be accepted by Canaccord and / or Peel Hunt (apart from the responsibilities or liabilities that may be imposed by the FSMA or other regulatory regime established thereunder) or by any of their respective affiliates or agents as to, or in relation to, the accuracy or completeness of this announcement or any other written or oral information made available to or publicly available to any interested party or its advisers, and any liability therefor is expressly disclaimed.

Canaccord Genuity Limited ("Canaccord"), which is authorised and regulated in the United Kingdom by the FCA, is acting as nominated adviser and bookrunner for the Company and for no-one else in connection with the Capital Raising, and Canaccord will not be responsible to anyone other than the Company for providing the protections afforded to its customers or for providing advice to any other person in relation to the Open Offer or any other matter referred to herein.

Peel Hunt LLP ("Peel Hunt"), which is authorised and regulated in the United Kingdom by the FCA, is acting as lead manager for the Company and for no-one else in connection with the Capital Raising, and Peel Hunt will not be responsible to anyone other than the Company for providing the protections afforded to its customers or for providing advice to any other person in relation to the Open Offer or any other matter referred to herein.

The distribution of this announcement and the offering of the New Ordinary Shares in certain jurisdictions may be restricted by law. No action has been taken by the Company, Canaccord or Peel Hunt that would permit an offering of such securities or possession or distribution of this announcement or any other offering or publicity material relating to such securities in any jurisdiction where action for that purpose is required. Persons into whose possession this announcement comes are required to inform themselves about, and to observe, such restrictions.

The information in this announcement may not be forwarded or distributed to any other person and may not be reproduced in any manner whatsoever. Any forwarding, distribution, dissemination, reproduction, or disclosure of this information in whole or in part is unauthorised. Failure to comply with this directive may result in a violation of the Securities Act or the applicable laws of other jurisdictions.

Neither the content of the Company's website nor any website accessible by hyperlinks on the Company's website is incorporated in, or forms part of, this announcement.