25 August 2026

Gulf Keystone Petroleum Ltd. (LSE: GKP & OSE)
(“Gulf Keystone”, “GKP” or “the Company”)

Interim dividend information

Gulf Keystone today announced the declaration of a $10 million interim dividend in connection with its 2026 Half Year Results. The Company confirms the following key information.

Payment information for OSE, LSE and certificated shareholders

OSE shareholders

Shareholders of GKP shares trading on Euronext Growth Oslo operated by the Oslo Stock Exchange (“OSE”) will receive the interim dividend in NOK. The Company will announce the NOK per share amount on 23 September 2026.

LSE shareholders holding CREST Depositary Interests

GKP shares trading on the LSE are settled through CREST Depositary Interests (“CDIs”) issued by Euroclear UK & International Limited (“Euroclear”). The CDIs are held in a nominee account for Euroclear registered in the Norwegian VPS. The interim dividend will be paid to the Euroclear nominee account in NOK, as per the conventions of the Norwegian VPS and according to the NOK per share amount announced on 23 September 2026. CDI holders will in turn receive the dividend in EUR, GBP or USD according to the preferred payment currency of their CREST account.

Where a CREST participant has not explicitly set a preferred CREST currency, the system will follow alphabetical order of eligible currencies as set out in the Euroclear International Service Description. This means payment would default to EUR (if the participant can receive EUR), or GBP if not, and finally USD if no EUR or GBP payment account is linked to the CREST account. Shareholders are encouraged to contact their broker or nominee account to confirm their final payment currency for the interim dividend.

Certificated shareholders

Certificated shareholders will continue to receive the interim dividend in either GBP or USD according to their currency election preference.

The default currency for the Company’s dividend payments to certificated shareholders is GBP, either via cheque or BACS. Dividend payments in USD can be paid by cheque only. Should certificated shareholders wish to change their current currency to USD or modify their payment methods, forms are available through Computershare Investor Services PLC at the following link:

https://www-uk.computershare.com/Investor/#Help/PrintableForms?issuerId=SCUKGKP

The final day for currency election for certificated shareholders will be 14 September 2026. Certificated shareholders who have previously amended their preferences are not required to do so again, unless they wish to make further changes.

Enquiries:

or visit: www.gulfkeystone.com

Notes to Editors:

Gulf Keystone Petroleum Ltd. (LSE & OSE: GKP) 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