Ms. Leigh Curyer reports

NEXGEN ANNOUNCES APPOINTMENT OF IVAN MULLANY TO ITS BOARD OF DIRECTORS

NexGen Energy Ltd. has appointed Ivan Mullany to the company's board of directors.

Leigh Curyer, chief executive officer, commented: "On behalf NexGen Energy's executive and board of directors, we are very pleased to welcome Mr. Ivan Mullany. Mr. Mullany has extensive knowledge and experience in the successful execution of global mining project construction and operational excellence. Mr. Mullany is joining an experienced team dedicated to the responsible development of the Rook 1 project that will create significant generational benefits to Saskatchewan and Canada, while playing a leading role globally in the delivery of clean energy fuel. Mr Mullany's skills and experience are an excellent complement to the board and timely, as Rook 1 advances into detailed engineering in 2023.

Mr. Mullany

Mr. Mullany, BSc, majoring in extractive metallurgy, CIMM, FAusIMM, has over 35 years in mining project management with broad international experiences. Most recently, with Newmont Corp. and its predecessor Goldcorp Inc. on the senior leadership team, he led numerous major projects, collectively in excess of $18-billion, during the engineering study, construction and execution stages.

About NexGen Energy Ltd.

NexGen Energy is a Canadian company focused on delivering clean energy fuel for the future. The company's flagship Rook 1 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 1 project is supported by a National Instrument (NI) 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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