FORM 11-K FOR ANNUAL REPORTS OF EMPLOYEE STOCKPURCHASE, SAVINGSAND SIMILAR PLANSPURSUANT TO SECTION 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 (Mark One): For the fiscal year endedDecember 31, 2025 OR TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the transition period from _______________ to _______________ Commissionfile number 0-14549 Full title of the plan and the address of the plan, if different from that of theissuer named below: First US Bancshares, Inc.401(k) Plan B.Name of issuer of the securities held pursuant to the plan and the address of its principal executiveoffice: First US Bancshares, Inc.3291 U.S. Highway 280Birmingham, Alabama 35243 REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FINANCIAL STATEMENTS Statements of Net Assets Available for BenefitsStatement of Changes in Net Assets Available for BenefitsNotes to Financial Statements SUPPLEMENTAL SCHEDULE* Schedule H, Line 4i – Schedule of Assets (Held at End of Year) EXHIBIT INDEX SIGNATURE * All other schedules required by Section 2520.103-10 of the Department of Labor’s Rules and Regulations for Reporting andDisclosure under the Employee Retirement Income Security Act of 1974 have been omitted because they are not applicable. REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the Audit CommitteeFirst US Bancshares, Inc. Opinion on the Financial Statements We have audited the accompanying statements of net assets available for benefits of the First US Bancshares, Inc. 401(k) Plan (the"Plan") as of December 31, 2025 and 2024, the related statement of changes in net assets available for benefits for the year endedDecember 31, 2025, and the related notes and schedule (collectively referred to as the "financial statements"). In our opinion, thefinancial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2025and 2024, and the changes in net assets available for benefits for the year ended December 31, 2025, in conformity with accountingprinciples 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 AccountingOversight Board (United States) ("PCAOB") and are required to be independent with respect to the Plan in accordance with theU.S. federal securities laws and 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 theaudit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to erroror 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 our audits, we are required to obtain an understanding of internal control over financial reporting, but not for the purposeof expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express nosuch opinion. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due toerror or 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 audits also included evaluating the accounting principlesused and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. Webelieve that our audits provide a reasonable basis for our opinion. Supplemental Information The supplemental information contained in the schedule of assets (held at end of year) as of December 31, 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 informationreconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures totest the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on thesupplemental information, we evaluated whether the supplemental information, including its form and content, is presented inconformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee RetirementIncome Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to thefinancial statements as a whole