帕卡 2025年度报告

☒ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934 For the transition period from _____ to _____ Commission file number 001-14817 PACCAR INC SAVINGS INVESTMENT PLAN(Full title of plan) PACCAR Inc777 106th Avenue, N.E.Bellevue, Washington 98004(Name of issue of securities held pursuant to theplan and address of its principal executive officers) REQUIRED INFORMATION A.Financial Statements and Supplemental ScheduleReport of Independent Registered Public Accounting FirmFinancial Statements:Statements of Net Assets Available for BenefitsStatement of Changes in Net Assets Available for BenefitsNotes to Financial StatementsSupplemental Schedule:Schedule H, Line 4a – Schedule of Delinquent Participant ContributionsSchedule H, Line 4i – Schedule of Assets (Held at End of Year) B.Exhibits 23Consent of Independent Registered Public Accounting Firm SIGNATURE The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer theemployee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized. PACCAR INC SAVINGS INVESTMENT PLANBy:/s/ P. H. BolgarP. H. BolgarVice President - Chief Human Resources OfficerPACCAR Inc Date: June 24, 2026 PACCAR Inc Savings Investment PlanDecember 31, 2025 and 2024and for the Year Ended December 31, 2025With Report of Independent Registered Public Accounting Firm PACCAR IncSavings Investment PlanFinancial Statements and Supplemental ScheduleDecember 31, 2025 and 2024 andfor the Year Ended December 31, 2025 Contents 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 4a – Schedule of Delinquent Participant ContributionsSchedule H, Line 4i – Schedule of Assets (Held at End of Year) To the Plan Participants and the Plan Administrator of PACCAR Inc Savings Investment Plan Opinion on the Financial Statements We have audited the accompanying statements of net assets available for benefits of PACCAR Inc Savings Investment Plan (thePlan) as of December 31, 2025 and 2024, and the related statement of changes in net assets available for benefits for the year endedDecember 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financialstatements present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2025 and 2024,and the changes in its net assets available for benefits for the year ended December 31, 2025, in conformity with U.S. generallyaccepted accounting principles. 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 the U.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 Schedules Required by ERISA The accompanying supplemental schedules of assets (held at end of year) as of December 31, 2025, and delinquent participantcontributions for the year then ended (referred to as the “supplemental schedules”), have been subjected to audit proceduresperforme