Directorate change

Harbour Energy plc(the "Company" or "Harbour Energy")

Board Change

9 December 2025

Harbour Energy is pleased to announce the appointment of Gregory Hill as an independent Non-Executive Director. Greg will join the Board on 1 January 2026 and will stand for election by shareholders at the Company's 2026 Annual General Meeting. He will serve on the Board's Audit & Risk and Health, Safety, Environment & Security Committees.

Greg joins the Board with extensive global energy leadership experience. He was President and Chief Operating Officer of Hess Corporation from January 2009 until completion of the merger of Hess with Chevron in July 2025; in addition, Greg served as an Executive Director on the Hess Board from 2009 to 2015. Before joining Hess, Greg spent 25 years at Shell in senior roles across Asia Pacific, Europe, and the U.S., including Executive Vice President of Exploration and Production for Shell Asia Pacific and Vice President of Production for Shell E&P Europe.

Harbour also announces that Alan Ferguson, who was appointed Interim Senior Independent Director in July 2025, has been confirmed in the role on a permanent basis. 

R. Blair Thomas, Chairman, commented:

"I am delighted to welcome Greg Hill to the Board as an Independent Non-Executive Director. Greg's significant experience in oil and gas will be of great value to the Board and its committees."

Enquiries Telephone +44 (0) 203 833 2421Elizabeth Brooks, SVP Investor RelationsAndy Norman, SVP CommunicationsRachel Rickard, Company Secretary

Additional disclosures

Greg also served on the Board of Hess Midstream (HESM) from 2017-2025. No further information is required to be disclosed under LR 6.4.8 (1) to (6) in respect of Gregory Hill.

Harbour energy plc LEI: 213800YPC42DYBKVPF97