Capital Reduction effective

HARBOUR ENERGY PLC

("Harbour" or the "Company")

Capital Reduction effective

3 August 2022

Harbour announces that the Capital Reduction, comprising the Share Premium Reduction and the Merger Reserve Reduction approved by shareholders at the General Meeting held on 11 May 2022, is now effective. This follows the confirmation of the Capital Reduction by the Court of Session, Edinburgh on 2 August 2022 and the registration of the Court order with the Registrar of Companies in Scotland on 3 August 2022.

The Capital Reduction creates additional distributable reserves to the value of US$6,310,960,275. This provides the Company with further flexibility to deliver shareholder returns over the coming years either in the form of dividends and/or share buybacks.

Terms used but not defined in this announcement are as defined in the Company's announcement of 13 April 2022.

Enquiries

Harbour Energy plc +44(0)20 7730 1111

Rachel Rickard, Company Secretariat

Elizabeth Brooks, Head of Investor Relations