Securities registered pursuant to Section 12(b) of the Act: 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 Exchange Act of1934 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 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submitsuch files). Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, oran emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growthcompany” in Rule 12b-2 of the Exchange Act. ☒Accelerated filer☐Smaller reporting companyEmerging 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 with anynew 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☒As of April 22, 2026, 24,559,649 shares of the registrant’s common stock ($0.01 par value) were outstanding. Part I - Financial Information (Unaudited) Item 1.Unaudited Interim Condensed Consolidated Financial StatementsCondensed Consolidated Balance Sheets - March 31, 2026 and December 31, 2025Condensed Consolidated Statements of Operations - Three Months Ended March 31, 2026 and2025Condensed Consolidated Statements of Comprehensive (Loss) Income - Three Months EndedMarch 31, 2026 and 2025 5Condensed Consolidated Statements of Stockholders’ Equity - Three Months Ended March 31,20266Condensed Consolidated Statements of Stockholders’ Equity - Three Months Ended March 31,20257Condensed Consolidated Statements of Cash Flows - Three Months Ended March 31, 2026 and20258Notes to Condensed Consolidated Financial Statements9Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations21Item 3.Quantitative and Qualitative Disclosures About Market Risk27Item 4.Controls and Procedures27 Part II - Other Information Item 1.Legal Proceedings28Item 1A.Risk Factors28Item 2.Unregistered Sales of Equity Securities and Use of Proceeds28Item 5.Other Information28Item 6.Exhibits29 Signatures PART I – FINANCIAL INFORMATION Barrett Business Services, Inc. Condensed Consolidated Statements of Operations(Unaudited)(In Thousands, Except Per Share Amounts) Barrett Business Services, Inc.Condensed Consolidated Statements of Stockholders’ EquityThree Months Ended March 31, 2026(Unaudited)(In Thousands) Barrett Business Services, Inc.Condensed Consolidated Statements of Stockholders’ EquityThree Months Ended March 31, 2025(Unaudited)(In Thousands) Barrett Business Services, Inc. Notes to Condensed Consolidated Financial Statements(Unaudited) Note 1 - Basis of Presentation of Interim Period Statements The accompanying condensed consolidated financial statements are unaudited and have been prepared by BarrettBusiness Services, Inc. (“BBSI”, the “Company”, “our” or “we”), pursuant to the rules and regulations of the Securitiesand Exchange Commission (“SEC”). Certain information and note disclosures typically included in financial statementsprepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) havebeen condensed or omitted pursuant to such rules and regulations. In the opinion of management, the condensedconsolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessaryfor a fair statement of the results for the interim periods presented. The accompanying condensed financial statements Reportable segment BBSI has one operating and reportable segment which provides business management solutions to small and mid-sized companies. The Company’s Chief Executive Officer is the chief operating decision maker (“CODM”). The CODMis provided financial information presented on a consolidated basis, including consolidated gross margin andconsolidated net income (loss), to assess the financial performance of the Company and to decide how to allocate The accounting policies of our reportable segment are the same as those of the consolidated entity.BBSI derives revenue exclusively in the United States and all of the Company’s long-lived assets are located in theUnited States. Revenue recognition Professional employer (“PEO”) services are normally used by organizations to satisfy ongoing needs related to themanagement of human capital and are governed by the terms of a