Intention to Move from AIM to the Main Market

THIS ANNOUNCEMENT IS FOR INFORMATION PURPOSES ONLY AND DOES NOT CONSTITUTE AN OFFER TO SELL OR ISSUE OR SOLICITATION TO BUY, SUBSCRIBE FOR OR OTHERWISE ACQUIRE SHARES IN SERICA ENERGY PLC IN ANY JURISDICTION.

28 September 2026

Serica Energy plc

(‘Serica’ or ‘the Company’)

Intention to Move from AIM to the Main Market

Serica Energy plc (AIM: SQZ), as per its previously stated aim of transferring from AIM to the Main Market, is now formally announcing its intention to apply for the Company’s ordinary shares (‘Ordinary Shares’) to be admitted to the Equity Shares (Commercial Companies) (‘ESCC’) segment of the Official List maintained by the Financial Conduct Authority (‘FCA’) (‘Official List’) and to trading on London Stock Exchange plc’s (‘London Stock Exchange’) main market for listed securities (‘Main Market’) (together, ‘Admission’).

Serica is a British independent upstream oil and gas exploration and production company with a portfolio of UK Continental Shelf assets. Serica is set to end the year as the sixth largest producer on the UKCS, with a balance of gas and oil production. The Company is generating material free cash flow from its producing assets, with the potential for significant organic growth in coming years, and a focus on creating shareholder value from its current portfolio and through M&A.

Serica will not be raising any funds or offering any new securities in connection with Admission or the publication of the related prospectus. The Admission will be effected through an introduction of the Company’s existing Ordinary Shares.

Admission is subject to the approval by the FCA of a prospectus and the Ordinary Shares being admitted by the FCA to the ESCC segment of the Official List and by the London Stock Exchange to trading on the Main Market. Subject to the satisfaction of these conditions, Admission is expected to occur before the end of October 2026. Accordingly, the Company hereby gives notice of the intended cancellation of trading of its Ordinary Shares on AIM in accordance with Rule 41 of the AIM Rules for Companies. The Company's listing on AIM is expected to be to be cancelled concurrently with Admission.

Admission is not conditional upon shareholder approval. Serica shareholders should note that the Company's Ordinary Shares will cease to be traded on AIM with effect from Admission and should consult their own professional advisors regarding the consequences of Admission.

Serica will make a further announcement on the status of the proposed applications for Admission, together with the timeline for Admission, in due course.

Peel Hunt LLP is acting exclusively as Sponsor to the Company and no one else in connection with Admission.

David Latin, Chair of Serica, stated:

“This is a notable milestone for Serica. The Company has come a long way since listing on AIM over 20 years ago. Serica has progressed to become one of the leading independent producers in the UK North Sea, with material and growing production, strong cash generation, and the opportunity to deliver value for shareholders through both exciting organic growth opportunities and disciplined acquisitions. We have been proud to be part of AIM, and the move to the Main Market reflects the scale and maturity of the business today, supporting our ambition to deliver long-term value for shareholders through providing the platform to take our investment case to the widest possible audience.”

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Enquiries:

About Serica Energy Plc

Serica Energy is an independent British oil and gas company with a broad portfolio of assets located in the UK Continental Shelf (UKCS). The Company operates assets that deliver around 10% of the UK’s gas production, a key component of the UK energy system, and has invested over £1 billion in the UK supply chain since 2020. Serica maintains a broadly balanced output of oil and gas across its operations.

The Company’s key producing assets are currently grouped around two major hubs: the Bruce, Keith, and Rhum fields in the Northern North Sea, where Serica is the operator; and a mix of operated and non-operated fields connected to the Triton FPSO in the Central North Sea. The Company also holds a notable position West of Shetland, including a 40% operated stake in the Greater Laggan Area offshore fields and associated Shetland Gas Plant.

Serica is also set to complete the acquisition of a package of operated and non-operated assets from Spirit Energy on or around 1 October 2026, including a 15% stake in the Cygnus field and 25% in Clipper South as well as the operated Greater Markham Area.

Serica aims to create shareholder value through a mix of production from existing oil and gas fields, organic investment and M&A.

Serica’s Ordinary Shares currently trade on the AIM market of the London Stock Exchange (ticker: SQZ), and the Company has announced its intention to move its listing to the Main Market of the LSE in 2026. More information about Serica is available on the Company’s website (www.serica-energy.com). To receive news updates by email, interested parties can subscribe through the website.

Important Notice

This announcement contains statements that are, or may be deemed to be, ‘forward-looking statements’. These forward-looking statements can be identified by the use of words such as ‘will’, ‘expect’, ‘could’, ‘believe’, ‘intend’, ‘should’ and words of similar meaning. All statements other than statements of historical facts included in this announcement, including those regarding the Company’s strategy, plans and objectives and the anticipated Admission are forward-looking statements. Readers are cautioned not to place undue reliance on such statements. Forward-looking statements involve a number of known and unknown risks, uncertainties and other factors, many of which are difficult to predict and generally beyond the control of Serica. These forward-looking statements speak only as of the date of this announcement. Serica expressly disclaims any obligation or undertaking to update or revise any forward-looking statement (except to the extent legally required).

Peel Hunt LLP (‘Peel Hunt’), which is authorised and regulated in the United Kingdom by the FCA, is acting exclusively for the Company  as Sponsor and no one else in connection with Admission and it will not regard any other person as a client in relation to Admission and will not be responsible to anyone other than the Company  for providing the protections afforded to its clients or for providing advice in relation to Admission or any other transaction, matter, or arrangement referred to in this announcement.

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 Peel Hunt or by any of its affiliates, partners, directors, officers, employees, advisers 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 therefore is expressly disclaimed.