Mr. Leigh Curyer reports

NEXGEN TO HOST Q4 2025 CONFERENCE CALL

NexGen Energy Ltd. will host its 2025 fourth quarter conference call on Wednesday, March 4, 2026, at 8:30 a.m. Eastern Standard Time.

During the call, NexGen's founder and chief executive officer, Leigh Curyer, chief commercial officer, Travis McPherson, and chief financial officer, Benjamin Salter, will provide an update on the advancement of its 100-per-cent-owned Rook I project. This will include insights into the recent completion of the Canadian Nuclear Safety Commission (CNSC) hearings, expansion at Patterson Corridor East (PCE) and supporting infrastructure advancements, as well as they key milestones ahead for the company in what promises to be a pivotal year.

Call-in details:

Date:  Wednesday, March 4, 2026

Time:  8:30 a.m. Eastern Standard Time

Participants should advise the operator that they are joining the NexGen Energy conference call to gain admission to the event:

North America toll-free number:   1-833-752-3734

Australia local toll number:  61-3-8592-6289

Prior to the call, the company will file its 2025 fourth quarter financial statements and management discussion and analysis on Tuesday, March 3, after the North American markets close. These fillings will be available for review on the NexGen website under reports and filings and on the company's SEDAR+ profile. In addition, a replay will be available on the NexGen website under events and presentations.

About NexGen Energy Ltd.

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The company's flagship Rook I project is being optimally developed into the largest low-cost-producing uranium mine globally, incorporating the most elite standards in environmental and social governance. The Rook I project is supported by a National Instrument 43-101-compliant feasibility study, which outlines the elite environmental performance and industry-leading economics. NexGen is led by a team of experienced uranium and mining industry professionals with expertise across the entire mining life cycle, including exploration, financing, project engineering and construction, operations, and closure. NexGen is leveraging its proven experience to deliver a project that leads the entire mining industry socially, technically and environmentally. The project and prospective portfolio in northern Saskatchewan will provide generational long-term economic, environmental and social benefits for Saskatchewan, Canada, and the world.

NexGen is listed on the Toronto Stock Exchange, the New York Stock Exchange under the ticker symbol NXE and on the Australian Securities Exchange under the ticker symbol NXG, providing access to global investors to participate in NexGen's mission of solving three major global challenges in decarbonization, energy security and access to power. The company is headquartered in Vancouver, B.C., with its primary operations office in Saskatoon, Sask.

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