Mr. Leigh Curyer reports

NEXGEN ENERGY TO HOST Q1 2025 CONFERENCE CALL ON ROOK I PROJECT DEVELOPMENTS

NexGen Energy Ltd. will host its 2025 first quarter conference call on Tuesday, May 20, 2025, at 10 a.m. Eastern Standard Time.

During the call, NexGen's founder, president and chief executive officer, Leigh Curyer, chief commercial officer, Travis McPherson, and chief financial officer, Benjamin Salter, will provide a comprehensive update on the company's 100-per-cent-owned Rook I project. This will include the latest milestones in project development, utility contracting and preparations for the final commission hearing as well as the exciting exploration activity at the new material discovery at Patterson Corridor East. Finally, management will provide the company's perspective on current market fundamentals, including supply constraints and resilient demand drivers.

Call-in details

Date:  Tuesday, May 20, 2025

Time:  10 a.m. EST

Participants should advise the operator that they are joining the NexGen Energy conference call to ensure proper admission to the event.

North America toll-free number:  1-844-763-8274

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

Participants accessing the call on-line will be automatically connected to the NexGen Energy conference without the need to speak with an operator.

Prior to the call, the company will file its 2025 first quarter financial statements and management discussion and analysis on Tuesday, May 13, 2025, before market open. 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 & 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 and 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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