NexGen Energy Ltd. — AGM Information 2022

May 19, 2022

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ANNUAL GENERAL AND SPECIAL MEETING OF SHAREHOLDERS NOTICE AND ACCESS NOTIFICATION TO SHAREHOLDERS

NexGen Energy Ltd. (" NexGen ") has chosen to use the notice and access model for delivery of meeting materials to its shareholders. Under notice and access, shareholders still receive a proxy or voting instruction form enabling them to vote at the shareholders' meeting. However, instead of receiving a paper copy of the Information Circular, shareholders receive this notice explaining how to access such materials electronically.

MEETING DATE AND LOCATION

WHEN: Thursday, June 23, 2022 at 2:00 p.m. (Vancouver time)

Shareholders will also be able to access but not participate in the formal aspect of the Meeting by webcast or teleconference using the details below:

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

CONFERENCE DIAL-IN: Conference ID: 31698720 Toronto: 416-764-8659 Vancouver: 778-383-7413 North American Toll Free: 1-888-664-6392 International Toll Free: Australia 1800076068 Hong Kong 800962712

LOCATION: The Offices of NexGen Energy Ltd. Suite 3150, 1021 West Hasting St. Vancouver BC

VOTING MATTERS

Election of Directors: To set the number of directors at nine members and to elect the nine (9) directors of the Company for the ensuing year. See the section entitled “ Election of Directors ” in the Circular.

Re-appointment of Auditors: Re-appoint KPMG LLP as independent auditor of the Company for the 2022 financial year and to authorize the directors to fix their remuneration. See the section entitled “ Appointment of Auditors ” in the Circular.

Re-approval of Option Plan: Approve the continuation of the Company’s current stock option plan. See the section entitled “ Re-approval of the Option Plan ” in the Circular.

SHAREHOLDERS ARE REMINDED TO VIEW THE MEETING MATERIALS PRIOR TO VOTING.

WEBSITES WHERE MEETING MATERIALS ARE POSTED

The Circular can be viewed online under the Company’s profile at www.sedar.com or on the Company’s website at www.nexgenenergy.ca .

HOW TO OBTAIN PAPER COPIES OF THE MEETING MATERIALS

Shareholders may request that a paper copy of the meeting materials be sent to them by postal delivery at no cost to them. Requests may be made up to one year from the date the Information Circular was filed on SEDAR by:

• Calling 1-800-841-5821; or

• Sending an email to ddang@nxe-energy.ca

If you request materials before the Meeting, the Information Circular will be sent to you at no charge within 3 business days of receiving your request. To receive the Information Circular before the voting deadline for the Meeting of 2:00 p.m. (Vancouver time) on June 21, 2022, your request must be received no later than Monday June 13, 2022. Please note that you will not receive another form of proxy or voting instruction form, so please keep the one you received with this notice.

If you request materials on the date of the Meeting or in the year following the filing of the Information Circular, it will be sent to you within 10 calendar days of receiving your request. Following the Meeting, the documents will remain available at the websites listed above for a period of at least one year.

NexGen has determined that only those shareholders with existing instructions on their account to receive paper material will receive a paper copy of the Information Circular with this notification.

VOTING

There are several convenient ways to vote your shares including online and via telephone. You will find attached to this notice a form of proxy or a voting instruction form containing detailed instructions on how to vote your shares. If you wish to attend and vote at the Meeting, please follow the instructions found in the enclosed form of proxy or voting instruction form. You are reminded to view the Meeting materials prior to voting.

Internet:Phone orFax:Mail:	Beneficial ShareholderShares held with a broker, bankor other intermediary	Registered ShareholdersShares held in own name andrepresented by a physicalcertificate	CDI Holders
			Shares held by way of CDIs
			through CHESS Depository
			Nominees Pty Limited
	www.proxyvote.com	www.investorvote.com	www.investorvote.com.au
	Call or fax to the number(s)listed on your voting instructionform	Phone: 1-866-732-8683Fax: 1-866-249-7775	Fax to the number(s) listed onyour CDI voting instruction form
	Return the voting instructionform in the enclosed postagepaid envelope	Return the form of proxy in theenclosed postage paidenvelope	Return the CDI voting instructionform to the address listed in yourCDI voting instruction form

Please submit your vote well in advance of the proxy deposit deadline of 2:00 p.m. (Vancouver time) on Tuesday, June 21, 2022.

CDI Holders must submit their CDI voting instruction form by no later than 9.00am on Monday, June 20, 2022 (Australian Western Standard Time).

BOARD RECOMMENDATION

The Board of Directors of NexGen unanimously recommends that Shareholders VOTE FOR all of the proposed resolutions.

If you have questions or require assistance with voting, please contact NexGen's proxy solicitation and information agent: Laurel Hill Advisory Group North American Toll-Free Number: 1-877-452-7184 Calls Outside North America: 416-304-0211 Email: assistance@laurelhill.com