Phoenix Feasibility Study 2023

Capital Structure & Corporate Information Market Summary(1) Management Exchanges Shares Outstanding Share Purchase Warrants Shareholders(4) TSX: DML NYSE American: DNN 888.6 M David Cates (President & CEO, Director) Elizabeth Sidle (VP Finance, Interim CFO) Kevin Himbeault (VP Operations & Reg. Affairs) Amanda Willett (VP Legal) 40% 52% Share Units 6.9 M Options 6.8 M Fully Diluted Shares 902.2 M DML (TSX) Market Cap @ C$2.22/share(2) CAD $1.97 B Daily Trading Volume(3) 2.1 M Shares DNN (NYSE American) Market Cap @ US$1.62/share(2) USD $1.44 B Daily Trading Volume (3) 8.6M Shares David Bronkhorst (Technical Advisor) Denison DML LISTED TSX DNN LISTED NYSE AMERICAN Board of Directors Ron Hochstein (Non-Executive Chair) Brian Edgar (Lead Director) Byeong Min An (KHNP Nominee) David Cates (President & CEO, Director) David Neuburger Laurie Sterritt Jennifer Traub Patricia Volker 8% ■ Institutional Insiders ■ Other (4) Shareholder information is estimated as of May 25, 2023. Information is provided for indicative purposes only. Institutional holdings are estimated based on information available on Bloomberg. Insider holdings are estimated based on applicable filings and includes estimated holdings from entities entitled to appoint a nominee to the Board of Directors. Other holdings are determined as shares outstanding less those reported as institutional and insider holdings. Share ownership is subject to change. LINKS: Website: www.denisonmines.com Twitter: @DenisonMinesCo Email: [email protected] NOTES: (1) Share capital information as of November 8, 2023 (Q3'2023 MDA). (2) Based on shares outstanding at November 8, 2023 (Q3'2023 MDA) and DML/DNN share prices as of the end of October 2023. (3) Average daily trading volume over previous 3 months as of the end of October 2023. 23

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