FORM 11-K ANNUAL REPORTPURSUANT TO SECTION 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934. [NO FEE REQUIRED, EFFECTIVE OCTOBER 7, 1996]. For the fiscal year ended December31, 2025 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934. [NO FEE REQUIRED]. For the transition period from ________________ to ________________ Commission file number 001-33390Entity Central Index Key 0001381668 A. Full title of the plan and the address of the plan, if different from that of the issuer named below: Third Federal 401(k) Savings Plan B. Name of the issuer of the securities held pursuant to the plan and the address of its principal executive office: TFS Financial Corporation7007 Broadway Avenue Cleveland, Ohio 44105 C. Amendment FlagTrue☐False TABLE OF CONTENTS Report of Independent Registered Public Accounting Firm Financial Statements:Statement of Net Assets Available for BenefitsStatement of Changes in Net Assets Available for BenefitsNotes to Financial Statements Supplemental Schedule: Report of Independent Registered Public Accounting Firm To the Plan Administrator and Plan Participants, Board of Directors and Retirement Plan CommitteeThird Federal 40l(k) Savings PlanCleveland, Ohio Opinion on the Financial Statements We have audited the accompanying statement of net assets available for benefits of the Third Federal 401(k) Savings Plan (the “Plan”) as ofDecember 31, 2025 and 2024, and the related statement of changes in net assets available for benefits for the years then ended (collectivelyreferred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the net assetsavailable for benefits of the Plan as of December 31, 2025 and 2024, and the changes in net assets available for benefits for the years thenended, in conformity with accounting principles generally accepted in the United States of America. Basis for Opinion These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on the Plan’sfinancial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board(United States) ("PCAOB") and are required to be independent with respect to the Plan in accordance with the U.S. federal securities lawsand the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits toobtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error orfraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding theamounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significantestimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits providea reasonable basis for our opinion. Supplemental Information The supplemental information in the Schedule of Assets Held for Investment Purposes at End of Year as of December 31, 2025 has beensubjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental information isthe responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental information reconciles tothe financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completenessand accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information in theaccompanying schedule, we evaluated whether the supplemental information, including its form and content, is presented in conformitywith Department of Labor’s (DOL) Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income SecurityAct of 1974. In our opinion, the supplemental information in the accompanying schedule is fairly stated, in all material respects, in relationto the financial statements as a whole. /s/ Meaden & Moore,Ltd.MEADEN & MOORE, Ltd. We have served as the Plan’s auditor since 2006. Cleveland, OhioJune25, 2026 STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITSThird Federal401(k) Savings Plan December 31,20252024 225,691,133204,569,347 —— $225,691,133$204,569,347 NOTES TO FINANCIAL STATEMENTS Third Federal401(k) Savings Plan Description of Plan The following description of the Third Federal 401(k) Savings Plan (Plan) pro