丹尼森矿业 2025年度报告

DENISON MINES CORP. (Exact name of registrant as specified in its charter) Ontario, Canada(Province or other jurisdiction of incorporation or organization)1090(Primary standard industrial classification code number)98-0622284(I.R.S. employer identification number)1100– 40 University AvenueToronto, Ontario M5J 1T1 Canada416-979-1991(Address and telephone number of registrant’s principal executive offices)C T Corporation System28 Liberty StreetNew York, NY 10005Phone number: 212-894-8940(Name, address and telephone number of agent for service in the United States)Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934 (“Exchange Act”): Securities for which there is a reporting obligation pursuant to Section15(d)of the Exchange Act:Not applicable. For annual reports, indicate by check mark the information filed with this form: Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by theannual report: 901,610,950 Common Shares as of December31, 2025. Indicate by check mark whether the registrant: (1)has filed all reports required to be filed by Section13(d)or 15(d)of the Exchange Act during thepreceding 12months (or for such shorter period that the registrant has been required to file such reports); and (2)has been subject to such filingrequirements in the past 90days. Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and posted pursuantto Rule405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrant was requiredto submit such files). Indicate by check mark whether the registrant is an emerging growth company as defined in Rule12b-2 of the Exchange Act. Emerging growth company☐ If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant haselected not to use the extended transition period for complying with any new or revised financial accounting standards † provided pursuant toSection13(a)of the Exchange Act.☐ †The term “new or revised financial accounting standard” refers to any update issued by the Financial Accounting Standards Board to itsAccounting Standards Codification after April5, 2012. Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internalcontrol over financial reporting under Section404(b)of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm thatprepared or issued its audit report.☒ If securities are registered pursuant to Section12(b)of the Exchange Act, indicate by check mark whether the financial statements of the registrantincluded in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensationreceived by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ EXPLANATORY NOTE Denison Mines Corp. (the “Company” or the “Registrant”) is an Ontario corporation eligible to file its Annual Reportpursuant to Section13(a)of the United States Securities Exchange Act of 1934, as amended (the “Exchange Act”), onForm40-F. The Registrant is a “foreign private issuer” as defined in Rule3b-4 under the Exchange Act. Equitysecurities of the Registrant are accordingly exempt from Sections 14(a), 14(b), 14(c), 14(f)and 16(b) and 16(c) of theExchange Act pursuant to Rule3a12-3 thereunder. DOCUMENTS FILED PURSUANT TO GENERAL INSTRUCTIONS In accordance with General Instruction B.(3) of Form 40-F, the Registrant hereby incorporates by reference Exhibits99.1 through 99.3 as set forth in the Exhibit Index attached hereto, which are deemed filed herewith. In accordance with General Instruction D.(9) of Form 40-F, the Registrant has filed written consents of certain expertsnamed in the foregoing Exhibits as Exhibits 99.4 and 99.9 through 99.28, as set forth in the Exhibit Index attachedhereto. CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS Certain of the information contained in this Annual Report on Form40-F, including the documents incorporated hereinby reference, may contain “forward-looking information” and “forward-looking statements” within the meaning ofapplicable Canadian and U.S. securities laws. Forward-looking information and statements may include, among others,statements regarding the future plans, costs, objectives or performance of the Company, or the assumptions underlyingany of the foregoing. In this Annual Report on Form40-F, words such as “may”, “would”, “could”, “will”, “likely”,“believe”, “expect”, “anticipate”, “intend”, “plan”, “estimate” and similar words and the negative form the