Operational Update for 6M ended 30 June 2026

Nostrum Oil & Gas PLC (LSE: NOG) ("Nostrum", or the "Company" and together with its subsidiaries, the "Group"), an independent energy company with gas processing infrastructure and an export hub in north-west Kazakhstan, today announces its operational update for the six months ended 30 June 2026 ("H1 2026").

Viktor Gladun, Chief Executive Officer of Nostrum Oil & Gas PLC, commented:

"Nostrum continues to demonstrate strong operational resilience and disciplined financial management, underpinned by our commitment to the highest standards of health, safety and environmental performance.

I am pleased to report that during H1 2026 the Group generated an EBITDA of over US$27 million, which is approximately 14% improvement compared to H1 2025, and a corresponding free cashflow of over US$11 million after the payment of coupon on bonds. This was a result of improved export volumes, higher product prices, and an operational growth, increasing average daily processed volumes by over 5% driven by higher third-party feedstock and effective operational management of the expected decline at Chinarevskoye field through well workovers.

We have taken further steps on the implementation of the extension of the maturity date of our bonds to 31 December 2030, and we are pleased to confirm that the majority bondholders supported the long-term standstill, which provides Nostrum a stable platform for realization of the longer-term value for all our stakeholders.

Looking ahead, we remain firmly focused on maintaining safe and reliable operations, safeguarding our financial resilience, and executing on our strategic priorities with discipline to create sustainable long‑term value for all our stakeholders."

H1 2026 Highlights:

Operational

Production and sales

· A 5.2% increase in average daily processed volumes (i.e. Chinarevskoye and Ural Oil & Gas LLP ("Ural O&G") feedstock, including condensate tolling) to 25,898 boepd in H1 2026 (H1 2025: 24,619 boepd). This includes a 4.8% increase in average daily titled output product volumes (i.e. Chinarevskoye production and dry gas and LPG produced from Ural O&G feedstock) to 17,790 boepd in H1 2026 (H1 2025: 16,974 boepd). These increases were achieved through continuing to process the ramping up feedstock from Ural O&G and managing the expected decline in Chinarevskoye production through well workovers of ESP failures and flow assurance well servicing.

• The split of the titled output product volumes was as follows:

• A 1.8% increase in average daily sales volumes to 15,837 boepd for H1 2026 (H1 2025: 15,555 boepd). The difference between titled output product volumes and sales volumes was primarily due to the internal consumption of dry gas produced and the timing of product deliveries, which leads to inventory increases or decreases at period end.

Chinarevskoye Field

A comprehensive review and assessment of potential well workovers and new drilling prospects is underway. In June 2026, the company successfully completed the planned maintenance of Gas Treatment Unit 3 within planned timeline and without cost overruns.

Processing of Ural O&G products

Throughout H1 2026, the Company continued processing raw gas and condensate volumes from Ural O&G, resulting in increased processed and titled output product volumes.

Stepnoy Leopard Fields

Financial

• H1 2026 revenue is estimated at approximately US$72 million (H1 2025: US$64.1 million). The increase was mainly driven by higher export volumes, stronger Brent crude oil price and increased sales and processed volumes. The average Brent crude oil price was US$92.2/bbl in H1 2026 (H1 2025: US$71.9/bbl).
• In H1 2026, the Group generated a net operating cash flow of approximately US$22 million, and a free cashflow of approximately US$11 million.
• In June 2026, following the receipt of the applicable regulatory licence, Nostrum made interest payments in the total amount of US$25.2 million, of which US$15.6 million were funded out of DSRA.
• The unrestricted cash and cash equivalents balance as at 30 June 2026 was in excess of US$154 million (31 December 2025: US$143.3 million, 31 March 2026: US$151.3 million).
• The Group remains focused on maximising facility uptime, controlling costs where possible and improving efficiencies across the business. At the same time, capital allocation remains disciplined and focused on preserving liquidity while assessing development opportunities across the asset base.
• On 26 June 2026, Nostrum launched a consent solicitation regarding certain amendments to the terms of the transaction announced on 30 March 2026, that seeks to implement a long-term standstill (including among others in respect of non-payment of principal of SSNs and SUNs) as described in more detailed in the relevant announcement and the consent solicitation memorandum. On 20 July 2026, The Group announced that the relevant meetings were held and the necessary approvals were obtained. The consent conditions as defined in the consent solicitation have therefore been satisfied, other than the consent condition relating to the tender offer, and such tender offer was launched on 24 July 2026.

HSE and ESG

• Zero fatalities among employees and contractors during operations in H1 2026 (H1 2025: zero).
• Total Recordable Incidents (incidents per million man-hours) of 3.0 in H1 2026 (H1 2025: 1.3).
• Lost Time Injury (incidents per million man-hours) of 2.3 in H1 2026 (H1 2025: zero)
• 1,871 tonnes of air emissions emitted in H1 2026 against 4,954 tonnes permitted for 2026 under the Kazakhstan Environmental Code.

Nostrum plans to release its H1 2026 interim financial report including unaudited interim condensed consolidated accounts on or around 11 August 2026.