Publication of a Prospectus

THIS IS AN ANNOUNCEMENT AND NOT A CIRCULAR OR PROSPECTUS AND INVESTORS SHOULD NOT MAKE ANY INVESTMENT DECISION ON THE BASIS OF ITS CONTENTS. A COMBINED CIRCULAR AND PROSPECTUS IN RELATION TO THE PROPOSED ACQUISITIONS DESCRIBED IN THIS ANNOUNCEMENT WILL BE PUBLISHED IN DUE COURSE. FOR IMMEDIATE RELEASE

EnQuest PLC

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

Publication of combined Circular and Prospectus and Notice of General Meeting

Further to the announcement made on 10 June 2026 (the "FOA Announcement") and the update announcement made on 10 July 2026 regarding the pre-emption rights in relation to Package 2, EnQuest is pleased to announce that it has today, following receipt of approval from the Financial Conduct Authority (the "FCA"), published a combined prospectus and shareholder circular (the "Prospectus") in relation to the proposed acquisitions of participating interests in four production sharing contracts in Malaysia from PETRONAS CARIGALI SDN. BHD. ("CARIGALI") for a maximum total consideration of US$833 million, subject to the Approval Conditions set out in the FOA Announcement (together the "Proposed Acquisitions").

The Prospectus will be posted to shareholders today and is available to view on EnQuest's website at https://www.enquest.com/investors/shareholder-information/malaysia-acquisition. A copy of the Prospectus will be submitted to the National Storage Mechanism and will also be available for inspection at https://data.fca.org.uk/#/nsm/nationalstoragemechanism. A general meeting of EnQuest's shareholders will be held at 9.00a.m. on 11 August 2026 (the "General Meeting") to consider and approve the Proposed Acquisitions. Full details and joining instructions are set out in the Notice of the General Meeting contained in the Prospectus.

The Proposed Acquisitions, should they complete, will together constitute a reverse takeover for the purposes of the UK Listing Rules of the FCA (the "UKLRs"). In addition, the acquisition of Package 1 alone (regardless of whether the acquisitions of Package 2 or Package 3 complete) constitutes a reverse takeover under the UKLRs. Therefore, the admission of the entire issued share capital of EnQuest ("Ordinary Shares") to the Equity Shares (Commercial Companies) ("ESCC") category of the Official List of the FCA and to trading on London Stock Exchange plc's main market for listed securities (the "Main Market") will be cancelled following Completion of the acquisition of Package 1, regardless of whether the acquisitions of Package 2 and Package 3 are completed. Provided completion in respect of Package 1 occurs, the Ordinary Shares are expected to be subsequently re-admitted to the ESCC category of the Official List of the FCA and to trading on the Main Market (together, "Re-admission") at 8.00am on the business day following Completion, expected to be on or around 4 January 2027.

The Company is not offering any new Ordinary Shares nor any other securities in connection with the Proposed Acquisitions. Following Re-admission, the Ordinary Shares will continue to be registered with their existing ISIN of: GB00B635TG28 and the Company's ticker symbol will continue to be ENQ on the Main Market.

Unless otherwise defined, all definitions used in this announcement have the same meanings as described in the Company's FOA Announcement on 10 June 2026.