Publication of 2025 Annual Report and Accounts & Sustainability Report

2 April 2026 Gulf Keystone Petroleum Ltd. (LSE: GKP & OSE) (“Gulf Keystone”, “GKP” or “the Company”) Publication of 2025 Annual Report and Accounts & Sustainability Report Gulf Keystone has today issued its Annual Report and Accounts for the year ended 31 December 2025 ("the Annual Report"). The Annual Report is available on the Company's website: www.gulfkeystone.com . The Annual Report includes Gulf Keystone’s 2025 Sustainability Report, which is also available to view as a separate document on the Company’s website, along with a summary of key sustainability metrics. The Company has published a copy of the Annual Report prepared using the single electronic reporting format specified in the Transparency Directive ESEF Regulation. In accordance with UK Listing Rule 9.6.1, a copy of the Company's Annual Report has been submitted to the National Storage Mechanism. Enquiries: Gulf Keystone: +44 (0) 20 7514 1400 Aaron Clark, Head of Investor Relations & Corporate Communications aclark@gulfkeystone.com FTI Consulting +44 (0) 20 3727 1000 Ben Brewerton Nick Hennis GKP@fticonsulting.com or visit: www.gulfkeystone.com Notes to Editors: Gulf Keystone Petroleum Ltd. (LSE: GKP & OSE) is a leading independent operator and producer in the Kurdistan Region of Iraq. Further information on Gulf Keystone is available on its website www.gulfkeystone.com Disclosure regulation: This information is subject to the disclosure requirements pursuant to Section 5-12 of the Norwegian Securities Trading Act and the Euronext Growth Rule Book Part II.