
[X]ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934 Commission file number 0-23333 Name of issuer of securities held pursuant to the plan and the address of its principal executive office: Timberland Bank624 Simpson AvenueHoquiam, Washington 98550 (a)Report of Independent Registered Public Accounting Firm1(b)Financial StatementsStatements of Net Assets Available for Benefits as of September 30, 2025 and 20242Statement of Changes in Net Assets Availablefor Benefits for the Year Ended September 30, 20254Notes to the Financial Statements5(c)Supplemental ScheduleSchedule H, Line 4i - Schedule of Assets (Held at End of Year)10Exhibits:(d)Exhibit 23.1 Consent of Aprio, LLP12 Signatures The Plan:Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons whoadminister employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto dulyauthorized. Administrator, Timberland Bank Employee Stock Ownership & 401(k) Plan By:/s/Marci A. BasichMarci A. Basich(name)Chief Financial Officer(title)Timberland Bank(bank) Date:March27, 2026 Timberland BankEmployee Stock Ownership & 401(k) Plan Financial Statements andSupplemental Schedule September 30, 2025 and 2024 Report of Independent Registered Public Accounting Firm Supplemental Schedule Schedule H, Line 4i - Schedule of Assets (Held at End of Year) Report of Independent Registered Public Accounting Firm To the Plan Administrator and Retirement Plan Committee of theTimberland Bank Employee Stock Ownership & 401(k) Plan Opinion on the Financial Statements We have audited the accompanying statement of net assets available for benefits of the Timberland Bank Employee Stock Ownership &401(k) Plan ("the Plan") as of September 30, 2025, and the related statement of changes in net assets available for benefits for the yearended September 30, 2025, and the related notes and schedules (collectively referred to as "the financial statements"). In our opinion,the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of September 30,2025, and the changes in net assets available for benefits for the year ended September 30, 2025, in conformity with accountingprinciples generally accepted in the United States of America ("U.S."). 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 audit. We are a public accounting firm registered with the Public Company Accounting OversightBoard (United States) ("PCAOB") and are required to be independent with respect to the Plan in accordance with the U.S. federalsecurities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB. We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit toobtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of ouraudit, we are required to obtain an understanding of internal control over financial reporting, but not for the purpose of expressing anopinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether due to erroror fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidenceregarding the amounts and disclosures in the financial statements. Our audit also included evaluating the accounting principles usedand significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believethat our audit provides a reasonable basis for our opinion. Supplemental Information The supplemental information contained in the schedule of assets (held at end of year) as of September 30, 2025 has been subjectedto audit procedures performed in conjunction with the audit of the Plan's financial statements. The supplemental information is theresponsibility 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 thecompleteness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplementalinformation, we evaluated whether the supplemental information, inclu