3 September 2026

ITHACA ENERGY PLC

("Ithaca Energy", the "Company" or the "Group")

Entry into FTSE 100

Ithaca Energy is pleased to confirm its promotion to the FTSE 100 Index, effective 21 September 2026, following the announcement made on 2 September 2026 by FTSE Russell.

Executive Chairman, Yaniv Friedman commented: "We're very pleased to be entering the FTSE 100, reflecting ongoing efforts of optimisation, growth and delivery of shareholder value. We welcome the opportunities our updated position unlocks, including being introduced to a new pool of potential investors, with whom we look forward to engaging."

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Notes:

About Ithaca Energy plc

Ithaca Energy is a leading UK independent exploration and production company with a strong track record of material value creation. In recent years, the Company has been focused on growing its portfolio of assets through both organic investment programmes and acquisitions and has seen a period of significant M&A driven growth centred upon three transformational acquisitions in recent years, including the recent Business Combination with Eni UK. Today, Ithaca Energy is one of the largest independent oil and gas companies in the United Kingdom Continental Shelf (the "UKCS"), ranking second largest independent by production with the largest resource base.

With stakes in six of the ten largest fields in the UKCS and two of UKCS's largest pre-development fields, and with energy security currently being a key focus of the UK Government, the Group believes it can utilise its significant reserves and operational capabilities to play a key role in delivering security of domestic energy supply from the UKCS.

Ithaca Energy serves today's needs for domestic energy through operating sustainably. The Group achieves this by harnessing Ithaca Energy's deep operational expertise and innovative minds to collectively challenge the norm, continually seeking better ways to meet evolving demands.

Ithaca Energy's commitment to delivering attractive and sustainable returns is supported by a well-defined emissions-reduction strategy with a target of achieving net zero ahead of targets set out in the North Sea Transition Deal.

Ithaca Energy plc was admitted to trading on the London Stock Exchange (LON: ITH) on 14 November 2022.

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