NexGen Energy Ltd. — Proxy Solicitation & Information Statement 2023

May 8, 2023

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Need assistance?

Phone:

1300 850 505 (within Australia) +61 3 9415 4000 (outside Australia)

Online:

www.investorcentre.com/contact

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YOUR VOTE IS IMPORTANT

For your vote to be effective it must be received by 9:00am (Australian Western Standard Time) on Monday, 12 June 2023.

CDI Voting Instruction Form

How to Vote on Items of Business

Each CHESS Depositary Interest (CDI) is equivalent to one share of Company Common Stock, so that every 1 (one) CDI registered in your name at Monday, 24 April 2023 entitles you to one vote.

You can vote by completing, signing and returning your CDI Voting Instruction Form. This form gives your voting instructions to CHESS Depositary Nominees Pty Ltd, which will vote the underlying shares on your behalf. You need to return the form no later than the time and date shown above to give CHESS Depositary Nominees Pty Ltd enough time to tabulate all CHESS Depositary Interest votes and to vote on the underlying shares.

Lodge your Form:

Online:

Lodge your vote online at

www.investorvote.com.au using your secure access information or use your mobile device to scan the personalised QR code.

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Your secure access information is

SIGNING INSTRUCTIONS FOR POSTAL FORMS

Individual: Where the holding is in one name, the securityholder must sign.

Joint Holding: Where the holding is in more than one name, all of the securityholders should sign.

Power of Attorney: If you have not already lodged the Power of Attorney with the Australian registry, please attach a certified photocopy of the Power of Attorney to this form when you return it.

Companies: Only duly authorised officer/s can sign on behalf of a company. Please sign in the boxes provided, which state the office held by the signatory, ie Sole Director, Sole Company Secretary or Director and Company Secretary. Delete titles as applicable.

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Control Number: 999999

PIN: 99999

For Intermediary Online subscribers (custodians) go to www.intermediaryonline.com

By Mail:

Computershare Investor Services Pty Limited GPO Box 242 Melbourne VIC 3001 Australia

By Fax:

1800 783 447 within Australia or +61 3 9473 2555 outside Australia

PLEASE NOTE: For security reasons it is important that you keep your SRN/HIN confidential.

You may elect to receive meeting-related documents, or request a particular one, in electronic or physical form and may elect not to receive annual reports. To do so, contact Computershare.

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Change of address. If incorrect, mark this box and make the correction in the space to the left. Securityholders sponsored by a broker (reference number commences with ‘ X ’) should advise your broker of any changes.

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CDI Voting Instruction Form

Please mark

to indicate your directions

Step 1 CHESS Depositary Nominees Pty Ltd will vote as directed

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Voting Instructions to CHESS Depositary Nominees Pty Ltd

I/We being a holder of CHESS Depositary Interests of NexGen Energy (Canada) Ltd hereby direct CHESS Depositary Nominees Pty Ltd to vote the shares underlying my/our holding at the Annual and Special Meeting of shareholders of the Company to be held at NexGen Office, Suite 3150, 1021 West Hastings Street, Vancouver, and online at https://emportal.ink/3Kd7WKp on June 15, 2023 at 2:00 pm (Pacific Time), and at any adjournment or postponement of that meeting.

By execution of this CDI Voting Form the undersigned hereby authorises CHESS Depositary Nominees Pty Ltd to appoint such proxies or their substitutes to vote in their discretion on such business as may properly come before the meeting.

Step 2

Items of Business

PLEASE NOTE: If you mark the Withhold box for an item, you are directing CHESS Depositary Nominees Pty Ltd or their appointed proxy not to vote on your behalf on a show of hands or a poll and your votes will not be counted in computing the required majority.

1. Number of Directors

For Against To set the number of Directors at ten (10). 2. Election of Directors For Withhold For Withhold For Withhold 01. Leigh Curyer 02. Christopher McFadden 03. Richard Patricio 04. Trevor Thiele 05. Warren Gilman 06. Sybil Veenman 07. Karri Howlett 08. Bradley Wall 09. Donald Roberts 10. Ivan Mullany

3. Appointment of Auditors

For Withhold

Appointment of KPMG LLP as Auditors of the Company for the ensuing year and authorizing the Directors to fix their remuneration.

4. Continuation of the Shareholder Rights Plan

For Against

Approve the continuation of the Company’s existing Shareholder Rights Plan.

Step 3 Signature of Securityholder(s)

This section must be completed.

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Individual or Securityholder 1 Securityholder 2 Securityholder 3
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Sole Director & Sole Company Secretary Director Director/Company Secretary Date
Update your communication details (Optional) By providing your email address, you consent to receive future Notice
Mobile Number Email Address of Meeting & Proxy communications electronically
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