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Notice of Annual General Meeting of Shareholders

You are hereby given notice of the Annual General Meeting of the Shareholders of Denison Mines Corp. (“Denison” or the “Company”).

The purpose of the Meeting is:

The Company is not aware of any items of business to be brought before the Meeting other than those noted above and further described in the accompanying Management Information Circular (the “Circular”). If you held shares in Denison on March 24, 2026, you are entitled to receive notice of and vote at this Meeting or any postponement or adjournment of it.

Your vote is important. We recommend you vote your shares in advance of the Meeting. We believe it is in the best interests of our shareholders, directors and employees for shareholders to communicate their votes and their opinions with the Company in advance of, instead of only at, the Meeting. Only registered shareholders and duly appointed proxyholders will be permitted at the Meeting.

We also recommend you refer to the Annual General Meeting page of the Company’s website at www.denisonmines.com for the most up-to-date information regarding the Meeting.

2026 DENISON NOTICE OF MEETING

How to Vote:

This notice is accompanied by the Circular which describes who can vote, how to vote, and what the Meeting will cover.

Please vote by using the proxy form or voting instruction form, as applicable, included with the “notice and access” notification and return it before 11:30 a.m. (Eastern Time) on May 8, 2026 in accordance with the instructions provided.

Meeting Materials:

As described in the “notice and access” notification mailed to shareholders of the Company, Denison has opted to deliver its Meeting materials to shareholders by posting them on its website at www.denisonmines.com. The use of this alternative means of delivery is more environmentally friendly and more economical as it reduces the Company’s paper and printing use and the Company’s printing and mailing costs.

The Meeting materials will be available on the Company’s website by April 8, 2026 and will remain on the website for one full year. The Meeting materials will also be available on SEDAR+ at www.sedarplus.ca and on the Electronic Data Gathering, Analysis, and Retrieval system (“EDGAR”) of the United States Securities and Exchange Commission at www.sec.gov/edgar by April 8, 2026.

Shareholders who wish to receive paper copies of the Meeting materials prior to the Meeting may request copies from Denison by calling 1-888-260-4455 or by sending an email to info@denisonmines.com. We recommend requests be made no later than April 28, 2026. Please note that Denison cannot guarantee delivery, and delivery could be subject to delay.

The 2025 Annual Report, including the audited consolidated financial statements and related management’s discussion and analysis for the year ended December 31, 2025, has been mailed to those shareholders who requested a copy. This information is also available on Denison’s website at www.denisonmines.com, on SEDAR+ and EDGAR, or on request by contacting the Company.

Contact Us:

If you have questions about the matters to be considered at the Meeting and/or if you wish to obtain additional information about Denison’s business, please do not wait until the Meeting. You can contact the Company directly:

Yours truly,

David Cates
Director, President & Chief Executive Officer
Dated March 30, 2026

2026 DENISON NOTICE OF MEETING