NexGen Energy CEO Leigh Curyer Certifies Interim Filings for Period Ended 30 September 2026

Mukul

10 November 2026 12:56 PM AEDT

NexGen Energy CEO Leigh Curyer Certifies Interim Filings for Period Ended 30 September 2026

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NexGen Energy Ltd. (ASX:NXG) Chief Executive Officer Leigh Curyer has signed a Form 52-109F2 full certificate certifying the company's interim financial report and interim management discussion and analysis for the period ended 30 September 2026, dated 9 November 2026.

Key Points

CEO Leigh Curyer certified the interim filings covering the period ended 30 September 2026 under National Instrument 52-109.
The certificate confirms no untrue statements of material fact or omissions exist in the interim filings, based on reasonable diligence.
The CEO and other certifying officers are responsible for establishing and maintaining disclosure controls and procedures (DC&P) and internal control over financial reporting (ICFR).
The COSO Internal Control – Integrated Framework was used to design the issuer's ICFR.
Any changes to ICFR occurring between 1 July 2026 and 30 September 2026 have been disclosed in the interim MD&A.

CEO Certification of Interim Financial Report

Leigh Curyer, Chief Executive Officer of NexGen Energy Ltd., certified on 9 November 2026 that he had reviewed the interim financial report and interim MD&A for the period ended 30 September 2026. According to the filing, Curyer confirmed that, based on his knowledge and having exercised reasonable diligence, the interim filings do not contain any untrue statement of a material fact, nor do they omit a material fact required to be stated or necessary to make a statement not misleading in light of the circumstances under which it was made.

Fair Presentation and Financial Condition Disclosure

The filing states that Curyer certified, based on his knowledge and reasonable diligence, that the interim financial report together with other financial information included in the interim filings fairly presents in all material respects the financial condition, financial performance, and cash flows of NexGen Energy Ltd. as of the date of and for the periods presented. The certification covers the interim period ended 30 September 2026 and was submitted in accordance with National Instrument 52-109 Certification of Disclosure in Issuers' Annual and Interim Filings.

Internal Controls Design and ICFR Framework

According to the filing, Curyer and the issuer's other certifying officers are responsible for establishing and maintaining DC&P and ICFR for NexGen Energy Ltd. The filing states that both DC&P and ICFR were designed, or caused to be designed under their supervision, as at the end of the period covered by the interim filings. The control framework applied to design the issuer's ICFR is the Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The filing further states that any change in ICFR occurring between 1 July 2026 and 30 September 2026 that materially affected, or is reasonably likely to materially affect, ICFR has been disclosed in the interim MD&A.

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