(Mark One)Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 ☒For the quarterly period ended June 30, 2026OR ☐Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934For the transition period fromtoCommission File Number: 001-09305 STIFEL FINANCIAL CORP. (Exact name of registrant as specified in its charter) Delaware(State or other jurisdiction ofincorporation or organization) 43-1273600(I.R.S. EmployerIdentification No.) 501 North Broadway, St. Louis, Missouri 63102-2188(Address of principal executive offices and zip code) (314) 342-2000(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Title of Each Class/ Trading Symbol Common Stock, $0.15 par value per share(SF)Depository Shares, each representing 1/1,000th interest in a share of 6.25% Non-Cumulative Preferred Stock, Series B (SF-PB)Depository Shares, each representing 1/1,000th interest in a share of 6.125% Non-Cumulative Preferred Stock, Series C (SF-PC)Depository Shares, each representing 1/1,000th interest in a share of 4.50% Non-Cumulative Preferred Stock, Series D(SF-PD)5.20% Senior Notes due 2047(SFB) Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities ExchangeAct of 1934 (“the Exchange Act”) during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),and (2) has been subject to such filing requirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was requiredto submit such files).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and“emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☒Accelerated filer☐Non-accelerated filer☐Smaller reporting company Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒ STIFEL FINANCIAL CORP.Form 10-QTABLE OF CONTENTS Item 1. Financial Statements3Consolidated Statements of Financial Condition as of June 30, 2026 (unaudited) and December 31, 20253Consolidated Statements of Operations for the three and six months ended June 30, 2026 and June 30, 2025(unaudited)4Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2026 and June 30,2025 (unaudited)5Consolidated Statements of Changes in Shareholders’ Equity for the three and six months ended June 30, 2026 andJune 30, 2025 (unaudited)6Consolidated Statements of Cash Flows for the six months ended June 30, 2026 and June 30, 2025 (unaudited)8Notes to Consolidated Financial Statements (unaudited)10Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations52Item 3. Quantitative and Qualitative Disclosures About Market Risk77Item 4. Controls and Procedures80 PART II – OTHER INFORMATIONItem 1. Legal Proceedings Item 1A. Risk FactorsItem 2. Unregistered Sales of Equity Securities and Use of ProceedsItem 3. Defaults Upon Senior SecuritiesItem 4. Mine Safety DisclosuresItem 5. Other InformationItem 6. ExhibitsSignatures 8181818181818283 Net of tax benefit of $0.7 million and tax expense of $6.7 million for the three months ended June 30, 2026 and 2025,respectively. Net of tax benefit of $3.5 million and tax expense of $13.8 million for the six months ended June 30, 2026 and2025, respectively.There were no reclassifications to earnings for the six months ended June 30, 2026 and 2025.(1)(2) See accompanying Notes to Consolidated Financial Statements. STIFEL FINANCIAL CORP.Consolidated Statements of Changes in Shareholders’ Equity(Unaudited) STIFEL FINANCIAL CORP.Consolidated Statements of Changes in Shareholders’ Equity (continued)(Unaudited) STIFEL FINANCIAL CORP.Consolidated Statements of Cash Flows(Unaudited) STIFEL FINANCIAL CORP.Consolidated Statements of Cash Flows (continued)(Unaudited) STIFEL FINANCIAL CORP.Notes to Consolidated Financial Statements(Unaudited) NOTE 1 – Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies Nature of Operations Stifel Financial Corp. (the “Company”), through its wholly owned subsidi