Retirement of Stephen Whyte and Appointment of Nikolay Ivin as Chairman

Nostrum Oil & Gas PLC (LSE: NOG) (“Nostrum” or the “Company“), an independent mixed-asset energy company with world-class gas processing facilities and export hub in north-west Kazakhstan, today announces that Stephen Whyte has retired as Chairman of the Board of Directors and as a director of the Company effective 16 October 2025. The Company also announces that the Board of Directors has appointed Nikolay Ivin as the new Chairman of the Board effective 16 October 2025.

As announced at the time of his appointment as a Nostrum board director on 15 July 2025, Mr Ivin has broad expertise in corporate finance across emerging markets, as co-founder and Managing Partner of Ziff-Ivin Associates Ltd, a UK-based financial advisory and management consulting practice. Mr Ivin has worked on financial advisory and restructuring assignments for international investors and companies all over Central and Eastern Europe, as well as Cyprus, Iceland, Kazakhstan, the Netherlands and the UK. Mr Ivin’s prior professional experience includes roles at Houlihan Lokey (Europe), Citigroup Corporate and Investment Bank (EMEA) and GE Capital (USA). Since 2021, Mr Ivin has also been serving as an independent supervisory board member of DTEK Energy B.V., an integrated energy and mining group.

These changes to the Board have received relevant consent in accordance with the requirements of the warrant instrument dated 9 February 2023 constituting the Company’s share warrants. The Company proposes to re-constitute the composition of the Board and relevant committees of the Board following additional appointments of directors in due course so as to comply with the relevant provisions of the warrant instrument.

Martin Gudgeon, director, said:

“The directors take this opportunity to thank Steve Whyte for his many contributions to the Company’s development and guidance of the Nostrum Board during his tenure as Chairman, and to congratulate and welcome Nick Ivin as he assumes the position of Chairman.”

Nikolay Ivin said:

“I am glad to take on my new role as Chairman, appreciating the trust placed in me by fellow board directors on behalf of the stakeholders. I look forward to working with my colleagues across Nostrum to strengthen, develop and grow the Company’s business, whilst taking into account the scheduled maturity of the Group’s Senior Secured Notes and Senior Unsecured Notes due in June 2026.”

LEI: 2138007VWEP4MM3J8B29

Further information
For further information please visit www.nostrumoilandgas.com

Further enquiries
Nostrum Oil & Gas PLC
Yelena Zhuravleva, CFO
ir@nog.co.uk

Instinctif Partners – UK
Galyna Kulachek
+ 44 (0) 207 457 2020
nostrum@instinctif.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.