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NexGen to Webcast Annual General Meeting and Presentation by Management on June 23, 2022

Shareholder Meetings

NexGen to Webcast Annual General Meeting and Presentation by Management on June 23, 2022

Vancouver, British Columbia, June 21, 2022 - NexGen Energy Ltd. ("NexGen" or the "Company")

(TSX:NXE, NYSE:NXE) announces that that in consideration of the ongoing COVID environment, the

Company will be providing a webcast facility in addition to the previously announced teleconference facility.

NexGen strongly encourages participants to follow the conduct of the Annual General Meeting (“AGM”) via

these facilities.

A presentation by Leigh Curyer, Chief Executive Officer, will follow the formal portion of the AGM , after

which a question-and-answer session will be held. Participants of the webcast and teleconference facilities

will be able to participate in the question-and-answer session following the formal part of the AGM and

presentation.

Webcast and Conference Call Details

NexGen will host a webcast and conference call for the AGM and management presentation on Thursday,

June 23, 2022, at 2:00 p.m. (Pacific Time).

Webcast Url:

https://produceredition.webcasts.com/starthere.jsp?ei=1550103&tp_key=c99fd7fe0f

Conference dial-in: Toronto: 416-764-8659

Vancouver: 778-383-7413

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

International Toll Free: Australia 1800076068 / Hong Kong 800962712

Conference ID: 31698720

To join the webcast, please copy the following link to your browser 5 – 10 minutes before the AGM start

time, where you will be directed to join the webcast:

NexGen encourages shareholders to read the meeting materials, which have been filed on SEDAR

(www.sedar.com) and are available on the Company’s website at nexgenenergy.ca

Shareholder Information and Questions

NexGen shareholders who have questions about the M anagement Information Circular, or require

assistance with voting their shares can contact the Company’s proxy solicitation agent, Laurel Hill Advisory

Group:

Laurel Hill Advisory Group

North America Toll Free: 1-877-452-7184

Outside North America: 1-416-304-0211

Email: [email protected]

About NexGen

NexGen is a British Columbia corporation focused on the development of the Rook I Project located in the

southwestern Athabasca Basin, Saskatchewan, Canada, into production. The Rook I Project is supported

by a NI 43 -101 compliant Feasibility Study which outlines elite enviro nmental performance as well as

industry leading economics. Rook I hosts the Arrow Deposit that hosts Measured Mineral Resources

of 209.6 M lbs of U3O8 contained in 2.18 M tonnes grading 4.35% U3O8, Indicated Mineral Resources of 47.1

M lbs of U3O8 contained in 1.57 M tonnes grading 1.36% U3O8, and Inferred Mineral Resources of 80.7 M lbs

of U3O8 contained in 4.40 M tonnes grading 0.83% U3O8.

NexGen has a highly experienced team of uranium industry professionals with a successful track record in

the discov ery of uranium deposits and in developing projects through discovery to production. The

Company is the recipient of the 2018 PDAC Bill Dennis Award for Canadian mineral discovery and the 2019

PDAC Environmental and Social Responsibility Award.

Contact Information

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Travis McPherson

Senior Vice President Corporate Development

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

Technical Disclosure

All technical information in this news release has been reviewed and approved by Anthony ( Tony) George ,

P.Eng., NexGen's Chief Project Officer, a qualified person under National Instrument 43-101.

A technical report in respect of the FS is filed on SEDAR ( www.sedar.com ) and EDGAR

(www.sec.gov/edgar.shtml ) and is available for review on NexGen Energy's website

(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 i n this news

release is not comparable to similar information that 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 fo rth 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. "Forward -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, anticipated

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 exp ected", "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 m arkets in which it

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

including among others, that the mineral 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 material

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 resu lts, 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 neg ative

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

financing, the risk that pending assay 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 more 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 variations 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 February 25, 2022 filed

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

with the United States Securities and Exchange Commission, which are availabl e on SEDAR

at www.sedar.com 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 intended.

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.