$150 million Share Buyback Programme

Harbour Energy plc

(the "Company" or "Harbour")

$150 million share buyback programme

5 November 2026

Harbour has today announced a new $150 million share buyback programme of the Company's ordinary shares.

The purpose of the programme is to reduce the Company's share capital and all ordinary shares purchased as part of this programme will be cancelled. The programme will commence following completion of the buyback programme announced in August, expected around year-end 2026, and will run until the end of Q1 2027. Harbour has entered into an irrevocable, non-discretionary agreement with Barclays to execute the programme on its behalf.

Any purchases of ordinary shares by the Company in relation to this announcement will be conducted in accordance with the relevant regulations (including but not limited to the Listing Rules) and Harbour's general authority to repurchase shares.

Pursuant to the authority granted by shareholders at the Company's Annual General Meeting held on 7 May 2026, the maximum number of ordinary shares which may be purchased by the Company is 152,750,304, being the number of ordinary shares remaining under that authority.

Enquiries

Harbour Energy plc     +44 (0) 203 833 2421

Elizabeth Brooks, SVP Investor Relations

Andy Norman, SVP Communications

Email: [email protected]