Mr. Leigh Curyer reports

NEXGEN ANNOUNCES REGULATORY APPROVAL OF 2025 SITE PROGRAM AT ROOK I PROPERTY

The Saskatchewan Ministry of Environment has granted approval for NexGen Energy Ltd.'s 2025 site program at its 100-per-cent-owned Rook I property in the Athabasca basin in Saskatchewan. The program includes the establishment of a temporary exploration airstrip, expansion of the exploration accommodation camp facilities by 373 beds and site access road improvements.

The program will commence in the coming weeks and conclude with camp commissioning in Q1 2026. This program builds on NexGen's disciplined, strategic approach to implementing infrastructure enhancements required to support the company's exploration programs at PCE and that forecast across NexGen's dominant land package in northwestern Saskatchewan into the future.

The drill results of high-grade basement-hosted mineralization discovered at PCE 3.5 kilometres east from the Arrow deposit indicate another significant-scale zone Arrow style of mineralization is materializing and warrant these infrastructure enhancements incorporating best practice safety and environmental principles.

Incorporating NexGen's long-standing approach to economic capacity building, the program will prioritize local priority area participation, generating new employment and contracting opportunities for indigenous and community members, reflecting NexGen's industry-leading and genuine approach to local communities.

Leigh Curyer, founder and chief executive officer, commented: "The 2025 site program marks an exciting strategic milestone for our current and future activities, with key infrastructure improvements that will optimize safety, environmental protection and efficiency for our people and our programs. These infrastructure enhancements create the conditions for a high-performing operational platform capable of fully evaluating the significant resource potential across our Rook I property. This program is a direct reflection of NexGen's pro-active approach to responsible resource development, elite planning, and demonstrates our continued commitment to building lasting value while creating meaningful opportunities for local indigenous and community members."

Scott Moe, the Premier of Saskatchewan, commented: "I congratulate and thank NexGen for their major investment in Saskatchewan to date. The Rook I project is one of the most significant projects across the country and we are keen to see it prioritized by the government of Canada accordingly. Our government is proud to approve these infrastructure activities, which are well within our jurisdiction and that are scheduled to commence imminently. NexGen is an example of strategically delivering a generational opportunity for Saskatchewan to become the world's leader in the mining of uranium, and I look forward to working with newly elected Prime Minister Mark Carney to expedite the final federal approval of this generational opportunity for Saskatchewan and Canada."

2025 site program overview:

• Temporary exploration airstrip:
  • Establishment of a gravel exploration airstrip (less than 1,000 metres) on the Rook I property to enhance health and safety of workers and accommodate an increase in the regional exploration program, augmenting emergency response capabilities and human and environmental protection through the reduction of vehicular transportation of personnel to site;
• Expansion of temporary exploration camp facilities:
  • Engineering, procurement and installation of hard-walled modular facilities to accommodate 373 additional beds, ensuring the site can house and service the expanded technical teams and specialized personnel as exploration activities intensify;
• Site access improvements:
  • Improvements to the 13-kilometre Rook I access road to enhance overall worker and equipment safety, including widening the road surface to allow for safe, two-way traffic flow;
  • Enhanced road base construction to support increased frequency of supply deliveries and specialized exploration equipment.

NexGen has the most significant land position in Saskatchewan's southwestern Athabasca basin, where it holds over 190,000 hectares. From an exploration perspective, the company is currently focused on the continued material growth of mineralization at PCE -- located just 3.5 kilometres east of the world-class Arrow deposit. Planning is already under way for potential future programs at PCE as the balance of the 2025 drilling program is preparing to recommence in June.

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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