11 June 2026

Serica Energy Plc.
('Serica' or 'the Company')

Completion of acquisition of assets from ONE-Dyas

Further to its announcement on 30 September 2025, Serica Energy Plc (AIM: SQZ) is pleased to announce that the acquisition from ONE-Dyas of a 10% interest in the Catcher Field and a 5.21% interest in the Golden Eagle Area Development ('GEAD'), has now completed.

The acquisition further diversifies Serica's producing portfolio, with current net production of around 2,500 boepd, and adds combined net 2P reserves of 3.0 mmboe and 2C resources of 0.5 mmboe as at 31 December 2025.

Serica has settled the consideration of $6.75 million, and has received a payment of $13.0 million, reflecting interim post-tax cashflows between the Economic Date of 1 January 2024 and the date of completion. In addition, Serica will receive around 85,000 barrels of oil equivalent in respect of an underlift position, with the associated cash proceeds of c.$8 million to be received in Q3.

-end-

Contacts:

Notes to Editors

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 also intends to complete the acquisition of a package of operated and non-operated assets from Spirit Energy in Q3 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 shares 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.