NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF THAT JURISDICTION

London and the Netherlands, 2 January 2026

Notification of delayed interest payments on the Senior Secured and Senior Unsecured Notes

Nostrum Oil & Gas Finance B.V. (the "Issuer"), a wholly-owned subsidiary of Nostrum Oil & Gas PLC (the "Parent"), was required by 30 June 2025 to have paid accrued interest in accordance with the terms and conditions of the Issuer's outstanding notes with ISIN USN64884AF16, US66978CAF95, USN64884AE41 and US66978CAD48 (the "Notes"). The Issuer was subsequently required to have paid accrued interest on the Notes by 31 December, 2025, and such amount remains unpaid. The Notes are guaranteed by, among other entities, the Parent.

The delay is the result of the continuing payment administration issue which currently does not permit the Issuer to make a payment on the Notes through the clearing systems. The Issuer has applied for the applicable regulatory licences to make such payment. The delay in the interest payments does not reflect any issue of the Parent's or Issuer's solvency or liquidity. All underlying funds for making the interest payments are available and secured.

The Issuer has made the second consent fee payment as set out in the terms of the previously consummated consent solicitation which shall mean that no default or event of default is caused by the failure to make the interest payment on the Notes at this time. Payment of the applicable consent fees shall be made by the relevant agent to the eligible holders in the coming days.

Timing

The Parent thanks holders of the Notes for their support and participation surrounding these third party issues which have affected the interest payment due on the Notes.

LEI: 2138007VWEP4MM3J8B29

Further information

For further information please visit www.nostrumoilandgas.com 

Further enquiries:

Nostrum Oil & Gas PLC

Thomas Hartnett - Chief Legal Officer / Company Secretary

ir@nog.co.uk

TEAM LEWIS                                                                                         

Galyna Kulachek

+ 44 (0) 20 7802 2664

nostrum@teamlewis.com

Notifying person

Thomas Hartnett

Company Secretary

About Nostrum Oil & Gas

Nostrum Oil & Gas PLC is an independent mixed-asset energy company with world-class gas processing facilities and export hub in north-west Kazakhstan. Its shares are listed on the London Stock Exchange (ticker symbol: NOG). The principal producing asset of Nostrum Oil & Gas PLC is the Chinarevskoye field which is operated by its wholly-owned subsidiary Zhaikmunai LLP, which is the sole holder of the subsoil use rights with respect to the development of the Chinarevskoye field. The Company also owns an 80% interest in Positiv Invest LLP, which holds the subsoil use rights for the "Kamenskoe" and "Kamensko-Teplovsko-Tokarevskoe" areas in the West Kazakhstan region (the Stepnoy Leopard fields).

Forward-Looking Statements

Some of the statements in this document are forward-looking. Forward-looking statements include statements regarding the intent, belief and current expectations of the Company or its officers with respect to various matters. When used in this document, the words "expects", "believes", "anticipates", "plans", "may", "will", "should" and similar expressions, and the negatives thereof, are intended to identify forward-looking statements. Such statements are not promises nor guarantees and are subject to risks and uncertainties that could cause actual outcomes to differ materially from those suggested by any such statements.

No part of this announcement constitutes, or shall be taken to constitute, an invitation or inducement to invest in the Company or any other entity, and shareholders of the Company are cautioned not to place undue reliance on the forward-looking statements. Save as required by the relevant listing rules and applicable law, the Company does not undertake to update or change any forward-looking statements to reflect events occurring after the date of this announcement.