An anonymous director reports

NEXGEN FILES MANAGEMENT INFORMATION CIRCULAR IN CONNECTION WITH ANNUAL GENERAL AND SPECIAL MEETING OF SHAREHOLDERS

NexGen Energy Ltd. has mailed a notice of meeting and management information circular to shareholders of record as of April 24, 2023, in connection with the annual general and special meeting of the company, to be held on Thursday, June 15, 2023, at 2 p.m. Pacific Time.

Your vote is important; please vote today.

NexGen encourages shareholders to read the meeting materials, which have been filed on SEDAR and are available on the company's website.

Shareholders will be asked to vote on the following matters:

• Set the number of directors at 10;
• Elect directors for the ensuing year;
• Reappoint KPMG LLP as independent auditor;
• Approve the amended and restated shareholder rights plan.

The board of directors of NexGen recommends that shareholders vote in favour of all proposed items.

To join the conference call by phone, please register yourself on-line and be connected into the conference call automatically or dial direct.

Conference ID:  46397367

International toll:  1-416-764-8659

North American toll-free:  1-888-664-6392

Location:  The offices of NexGen, Suite 3150, 1021 West Hastings St., Vancouver, B.C., Canada

Participants of the webcast and conference call will be able to participate in the question-and-answer session following the formal business of the meeting and presentation.

Please submit your vote well in advance of the proxy deposit deadline of 2 p.m. Pacific Time on Tuesday, June 13, 2023.

Shareholder information and questions

NexGen shareholders who have questions about the management information circular or require assistance with voting their shares can contact the company's proxy solicitation agent, TMX Investor Solutions Inc.

North America toll-free:  1-800-706-3274

Outside North America:  1-201-806-7301

E-mail:  info_tmxis@tmx.com

About NexGen Energy Ltd.

NexGen 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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