Holding(s) in Company

About this update from Harbour Energy Plc

TR-1: Standard form for notification of major holdings 1. Issuer Details ISIN GB00BMBVGQ36 Issuer Name HARBOUR ENERGY PLC UK or Non-UK Issuer UK 2. Reason for Notification An acquisition or disposal of voting rights 3. Details of person subject to the notification obligation Name BASF SE City of registered office (if applicable) Ludwigshafen am Rhein Country of registered office (if applicable) Deutschland 4. Details of the shareholder Name City of registered office Country of registered office Vidacos Nominees Limited London England 5. Date on which the threshold was crossed or reached 18-Mar-2026 6. Date on which Issuer notified 20-Mar-2026 7. Total positions of person(s) subject to the notification obligation % of voting rights attached to shares (total of 8.A) % of voting rights through financial instruments (total of 8.B 1 + 8.B 2) Total of both in % (8.A + 8.B) Total number of voting rights held in issuer Resulting situation on the date on which threshold was crossed or reached 40.950900 0.000000 40.950900 646912035 Position of previous notification (if applicable) 41.500000 0.000000 41.500000 8. Notified details of the resulting situation on the date on which the threshold was crossed or reached 8A. Voting rights attached to shares Class/Type of shares ISIN code(if possible) Number of direct voting rights (DTR5.1) Number of indirect voting rights (DTR5.2.1) % of direct voting rights (DTR5.1) % of indirect voting rights (DTR5.2.1) GB00BMBVGQ36 646912035 40.950900 Sub Total 8.A 646912035 40.950900% 8B1. Financial Instruments according to (DTR5.3.1R.(1) (a)) Type of financial instrument Expiration date Exercise/conversion period Number of voting rights that may be acquired if the instrument is exercised/converted % of voting rights   Sub Total 8.B1 8B2. Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b)) Type of financial instrument Expiration date Exercise/conversion period Physical or cash settlement Number of voting rights % of voting rights   Sub Total 8.B2 9. Information in relation to the person subject to the notification obligation 2. Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entities (please add additional rows as necessary) Ultimate controlling person Name of controlled undertaking % of voting rights if it equals or is higher than the notifiable threshold % of voting rights through financial instruments if it equals or is higher than the notifiable threshold Total of both if it equals or is higher than the notifiable threshold BASF SE (Chain 1) BASF Handels- und Exportgesellschaft mit beschränkter Haftung 40.950900 40.950900% BASF SE (Chain 1) Vidacos Nominees Ltd 40.950900 40.950900% 10. In case of proxy voting Name of the proxy holder   The number and % of voting rights held   The date until which the voting rights will be held   11. Additional Information BASF SE is making this notification on behalf of itself and on behalf of its wholly owned subsidiary BASF Handels und Exportgesellschaft mit beschränkter Haftung. BASF SE and BASF Handels und Exportgesellschaft mit beschränkter Haftung hold the shares in Harbour Energy plc indirectly via a custodian, Vidacos Nominees Limited (as described in section 9 above), which holds the legal title to those shares on their behalf pursuant to a custody arrangement. 12. Date of Completion 20-Mar-2026 13. Place Of Completion Ludwigshafen, Germany

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