NexGen Energy Ltd. — Proxy Solicitation & Information Statement 2026

May 21, 2026

NexGen

Energy Ltd.

NexGen Energy (Canada) Ltd (ARBN 649 325 128)

A foreign company registered in its original jurisdiction

of British Columbia, Canada as NexGen Energy Ltd.

Need assistance?

Phone:

1300 850 505 (within Australia)

+61 3 9415 4000 (outside Australia)

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Online:

www.investorcentre.com/contact

NXG

MR SAM SAMPLE

FLAT 123

123 SAMPLE STREET

THE SAMPLE HILL

SAMPLE ESTATE

SAMPLEVILLE VIC 3030

YOUR VOTE IS IMPORTANT

For your vote to be effective it must be received by 9:00 am (AWST) on June 25, 2026.

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 May 11, 2026 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.

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.

Lodge your Form: XX

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.

Your secure access information is

Control Number: 999999

SRN/HIN: I9999999999

PIN: 99999

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.

Samples/000001/000001

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MR SAM SAMPLE
FLAT 123
123 SAMPLE STREET
THE SAMPLE HILL
SAMPLE ESTATE
SAMPLEVILLE VIC 3030

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.

I 9999999999 IND

CDI Voting Instruction Form

Please mark ☐ to indicate your directions

Step 1 CHESS Depositary Nominees Pty Ltd will vote as directed

XX

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 General 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/4tymBoT on June 30, 2026 at 2:00 pm (Pacific Time) / July 1, 2026 at 5:00 am (AWST), 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.

VOTING RECOMMENDATIONS FOR RESOLUTIONS 1 - 4 ARE "FOR".

1. Number of Directors

To set the number of Directors at nine (9).

1. Election of Directors

	For Withhold		For Withhold		For Withhold
01. Leigh Curyer	☐	☐	02. Christopher McFadden	☐	☐	03. Richard Patricio
04. Sharon Birkett	☐	☐	05. Warren Gilman	☐	☐	06. Sybil Veenman
07. Karri Howlett	☐	☐	08. Bradley Wall	☐	☐	09. Ivan Mullany

1. Appointment of Auditors

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

For	Withhold
☐	☐

1. Continuation, amendment, and restatement of the Company's Shareholders Right's plan

Approve the continuation of the Amended and Restated Shareholder Rights Plan, as described in the Management Information Circular.

For	Against	Withhold
☐	☐	☐

Step 3 Signature of Securityholder(s)

This section must be completed.

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

NXG

999999A

Computershare

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