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NXE.TO ·

NexGen Annual General and Special Meeting of Shareholders to be

Shareholder Meetings

NexGen Annual General and Special Meeting of Shareholders to be

Held June 10, 2021

Vancouver, BC, May, 10, 2021 – NexGen Energy Ltd. (“NexGen” or the “Company”) (TSX: NXE, NYSE MKT:

NXE) is pleased to announce it has mailed the Notice of Meeting and Management Information Circular to

shareholders record as of April 30, 2021 in connection with the Annual General and Special Meeting to be

held Thursday, June 10, 2021, at 2:00 p.m. (Pacific Time).

Due to the impacts of the COVID-19 pandemic, governmental recommendations and/or orders for physical

distancing, restrictions on group gatherings, non -essential travel and business activities we request that

shareholders do no attend the meeting in person. To mitigate any risks to stakeholders, employees, partners

and community members , the Company will hold this year’s meeting by conference call , details below .

Shareholders are encouraged to cast their votes in advance by proxy.

Conference Call dial in details:

To join the conference call please dial:

International Callers: (+1) 416 764 8659

North America Callers: (+1) 888 664 6392

Conference ID: 33931792

Shareholders will be asked to vote on the following matters:

1. elect the nine (9) Directors for the ensuing year;

2. re-appoint KPMG LLP as independent auditor of the Company for the 2021 financial year and to

authorize the directors to fix their remuneration.

The Board of Directors of NexGen recommends that shareholders

vote in favour of all proposed items.

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

(www.sedar.com) and are on the Company’s website at https://www.nexgenenergy.ca/investors/agm/.

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, 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 with a focus on developing the Rook I Project located in the south

western Athabasca Basin, Saskatchewan, Canada into production. NexGen has a highly experienced team

of uranium industry professionals with a successful track record in the discovery of uranium deposits and in

developing projects through discovery to production. NexGen also owns a portfolio of highly prospective

uranium properties in the south western Athabasca Basin, Saskatchewan, Canada.

Contact Information

Leigh Curyer

Chief Executive Officer

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

www.nexgenenergy.ca

Travis McPherson

Senior Vice President Corporate Development

NexGen Energy Ltd.

+1 604 428 4112

[email protected]

http://www.nexgenenergy.ca

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 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 exp ectations, 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 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 pr oviding 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 i mplied 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

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 March 11, 2020 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 available on SEDAR at www.sedar.com and Edgar at

www.sec.gov.

Although the Company has a ttempted 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.

SOURCE NexGen Energy Ltd.