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NexGen Energy to Host Q1 2024 Conference Call on Rook I Project Developments

Financials

NexGen Energy to Host Q1 2024 Conference Call on Rook I Project Developments

Vancouver, BC, May 9th 2024 - NexGen Energy Ltd. ("NexGen" or the "Company") (TSX: NXE; NYSE:

NXE; ASX: NXG) is pleased to announce the Company will host its 2024 first quarter conference call on

Tuesday, May 14, 2024, at 8:30 am Eastern Standard Time.

During the call, NexGen’s President and Chief Executive Officer, Leigh Curyer, Chief Commercial Officer,

Travis McPherson, and Chief Financial Officer, Benjamin Salter will provide an update on the Company’s

100% owned Rook I Project (the “Project”) covering all aspects including , finalization of the F ederal

permitting and licensing process, project development, new exploration discovery, treasury and financing,

as well as current market dynamics including marketing strategy .

Call-in Details:

Date: Tuesday, May 14, 2024

Time: 8:30 am Eastern Standard Time

RapidConnect URL: https://emportal.ink/3VJ6lU3

North America Toll Free: 1-888-664-6392

Australia Toll-Free: 1-800-076068

The Company has submitted its Financial Statements and Management Discussion & Analysis for the first

quarter of 2024. These documents are a vailable for review on the NexGen website, under Reports and

Filings, and on the Company’s SEDAR+ profile at www.sedarplus.com. In addition, a replay will be available

on the NexGen website under Events & Presentations.

Further Information is available at www.nexgenenergy.ca.

About NexGen

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 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 en tire 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, British Columbia, with

its primary operations office in Saskatoon, Saskatchewan.

Contact Information

Travis McPherson

Chief Commercial Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

www.nexgenenergy.ca

Monica Kras

Vice President, Corporate Development

NexGen Energy Ltd.

+44 (0) 7307 191933

[email protected]

www.nexgenenergy.ca

Cautionary Note to U.S. Investors

This news release includes Mineral Reserves and Mineral Resources classification terms that comply with

reporting standards in Canada and the Mineral Reserves and the Mineral Resources estimates are made

in accordance with NI 43-101. NI 43-101 is a rule developed by the Canadian Securities Administrators that

establishes standards for all public disclosure an issuer makes of scientific and technical information

concerning mineral projects. These standards differ from the requirements of the Securities and Exchange

Commission ("SEC") set by the SEC's rules that are applicable to domestic United States reporting

companies. Consequently, Mineral Reserves and Mineral Resources information included in this news

release is not comparable to similar information th at would generally be disclosed by domestic U.S.

reporting companies subject to the reporting and disclosure requirements of the SEC Accordingly,

information concerning mineral deposits set forth herein may not be comparable with information made

public by companies that report in accordance with U.S. standards.

Forward-Looking Information

The information contained herein contains "forward -looking statements" within the meaning of applicable

United States securities laws and regulations and "forward -looking information" within the meaning of

applicable Canadian securities legislation. "Forwa rd-looking information" includes, but is not limited to,

statements with respect to mineral reserve and mineral resource estimates, the 2021 Arrow Deposit, Rook

I Project and estimates of uranium production, grade and long -term average uranium prices, anti cipated

effects of completed drill results on the Rook I Project, planned work programs, completion of further site

investigations and engineering work to support basic engineering of the project and expected outcomes.

Generally, but not always, forward-looking information and statements can be identified by the use of words

such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends",

"anticipates", or "believes" or the negative connotation thereof or variations of such words and phrases or

state that certain actions, events or results "may", "could", "would", "might" or "will be taken", "occur" or "be

achieved" or the negative connotation thereof. Statements relating to "mineral resources" are deemed to

be forward-looking information, as they involve the implied assessment that, based on certain estimates

and assumptions, the mineral resources described can be profitably produced in the future.

Forward-looking information and statements are based on the then current expectations, beliefs,

assumptions, estimates and forecasts about NexGen's business and the industry and markets in which it

operates. Forward -looking information and statements are made based upon numerous assumptions,

including among others, that the min eral reserve and resources estimates and the key assumptions and

parameters on which such estimates are based are as set out in this news release and the technical report

for the property, the results of planned exploration activities are as anticipated, the price and market supply

of uranium, the cost of planned exploration activities, that financing will be available if and when needed

and on reasonable terms, that third party contractors, equipment, supplies and governmental and other

approvals required to conduct NexGen's planned exploration activities will be available on reasonable terms

and in a timely manner and that general business and economic conditions will not change in a materially

adverse manner. Although the assumptions made by the Company in providing forward-looking information

or making forward-looking statements are considered reasonable by management at the time, there can

be no assurance that such assumptions will prove to be accurate in the future.

Forward-looking information and statements also involve known and unknown risks and uncertainties and

other factors, which may cause actual results, performances and achievements of NexGen to differ

materially from any projections of results, performances and achievements of NexGen expressed or implied

by such forward -looking information or statements, including, among others, the existence of negative

operating cash flow and dependence on third party financing, uncertainty of the availability of additional

financing, the risk that pending ass ay results will not confirm previously announced preliminary results,

conclusions of economic valuations, the risk that actual results of exploration activities will be different than

anticipated, the cost of labour, equipment or materials will increase mo re than expected, that the future

price of uranium will decline or otherwise not rise to an economic level, the appeal of alternate sources of

energy to uranium-produced energy, that the Canadian dollar will strengthen against the U.S. dollar, that

mineral resources and reserves are not as estimated, that actual costs or actual results of reclamation

activities are greater than expected, that changes in project parameters and plans continue to be refined

and may result in increased costs, of unexpected vari ations in mineral resources and reserves, grade or

recovery rates or other risks generally associated with mining, unanticipated delays in obtaining

governmental, regulatory or First Nations approvals, risks related to First Nations title and consultation,

reliance upon key management and other personnel, deficiencies in the Company's title to its properties,

uninsurable risks, failure to manage conflicts of interest, failure to obtain or maintain required permits and

licences, risks related to changes in laws, regulations, policy and public perception, as well as those factors

or other risks as more fully described in NexGen's Annual Information Form dated March 6, 2024 filed with

the securities commissions of all of the provinces of Canada except Quebec an d in NexGen's 40 -F filed

with the United States Securities and Exchange Commission, which are available on SEDAR+ at

www.sedarplus.ca and Edgar at www.sec.gov.

Although the Company has attempted to identify important factors that could cause actual results to differ

materially from those contained in the forward -looking information or statements or implied by forward -

looking information or statements, there may be other factors that cause results not to be as anticipated,

estimated or intended. Readers are cautioned not to place undue reliance on forward -looking information

or statements due to the inherent uncertainty thereof.

There can be no assurance that forward -looking information and statements will prove to be accurate, as

actual results and future events could differ materially from those anticipated, estimated or intende d.

Accordingly, readers should not place undue reliance on forward -looking statements or information. The

Company undertakes no obligation to update or reissue forward -looking information as a result of new

information or events except as required by applicable securities laws.