$250 million share buyback programme.

Harbour Energy plc

(the "Company" or "Harbour")

$250 million share buyback programme

6 August 2026

Harbour has today announced a share buyback programme of the Company's ordinary shares for up to a maximum aggregate consideration of $250 million.

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 is expected to commence today, 6 August 2026 and will end no later than 5 March 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 236,805,964.

Enquiries

Harbour Energy plc                                                       

Elizabeth Brooks, SVP Investor Relations

Andy Norman, SVP Communications

Tel: +44 (0) 20 3833 2320

Email: CorporateExternalCommunications@harbourenergy.com