0ANNUAL REPORT PURSUANT TO SECTION13OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December31, 2025OR□TRANSITION REPORT PURSUANT TO SECTION13OR15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the transition period from_____toCommission File Number:001-40620 Indicate by check markifthe registrant is a well-known seasoned issuer,asdefined in Rule 405ofthe Securities Act.Yes0No□ Indicate by check markifthe registrant is not required to file reports pursuanttoSection13or Section 15(d)ofthe Act.Yes□No0 Indicate by check mark whether the registrant(I)has filed all reports required to be filed by Section13or 15(d)ofthe Securities Exchange Actof1934 during the preceding12months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days.Yes0No□ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405ofRegulation S-T (§ 232.405ofthis chapter) during the preceding12months (or for such shorter period that the registrant was required to submit such files).Yes0No□ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, oran emerging growth company. See the definitionsof"large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growthcompany" in Rule 12b-2ofthe Exchange Act. Emerging growth company□ Ifan emerging growth company, indicate by check markifthe registrant has elected not to use the extended transition period for complying with anynew or revised financial accounting standards provided pursuanttoSection 13(a)ofthe ExchangeAct.□ Indicate by check mark whether the registrant has filed a report on and attestationtoits management's assessmentofthe effectivenessofits internalcontrol over financial reporting under Section 404(b)ofthe Sarbanes-Oxley Act (15 U .S.C. 7262(b))by the registered public accounting firm that prepared orissued its audit report.0 Ifsecurities are registered pursuanttoSection l 2(b)ofthe Act, indicate by check mark whether the financial statementsofthe registrant included inthe filing reflect the correctionofan error to previously issued financial statements.□ Indicate by check mark whether anyofthose error corrections are restatements that required a recovery analysisofincentive-based compensationreceived by anyofthe registrant's executive officers during the relevant recovery period pursuantto§240.1OD-I (b).□ The aggregate market valueofthe registrant's common stock held by non-affiliatesofthe registrant asofJune30, 2025 , was approximately $12.6billion based on the closing price per share on that dateof$ ! 16.69 as reported on the New York Stock Exchange. The numberofsharesofthe registrant's common stock, par value $0.01 , outstanding asofFebruary11, 2026, was I10,605 ,069. DOCUMENTS INCORPORATED BY REFERENCE Portionsofthe registrant's definitive proxy statement for its annual meetingofstockholders to be held on May14, 2026, are incorporated by referenceinto Part II and Part IIIofthis Form 10-K. BUILDERS FIRSTSOURCE, INC.TableofContentstoForm 10-K Item 1.Item lA.ItemlB.Item lC.Item 2.Item 3.Item 4.Item 5.Item 6.Item 7.Item 7A.Item 8.Item 9.Item 9A.Item 9B.Item 9C.Item 10.Item11.Item12.Item13.Item 14.Item15.Item16PARTIBusinessRisk FactorsUmesolved Staff CommentsCybersecurityPropertiesLegal ProceedingsMine Safety DisclosuresPART IIMarket for Registrant's Common Equity, Related Stockholder Matters and Issuer PurchasesofEquity SecuritiesReservedManagement's Discussion and AnalysisofFinancial Condition and ResultsofOperationsQuantitative and Qualitative Disclosures About Market RiskFinancial Statements and Supplementary DataChanges in and Disagreements with Accountants on Accounting and Financial DisclosureControls and ProceduresOther InformationDisclosure Regarding Foreign Jurisdictions That Prevent InspectionsPART IIIDirectors, Executive Officers and Corporate GovernanceExecutive CompensationSecurity OwnershipofCertain Beneficial Owners and Management and Related Stockholder MattersCertain Relationships and Related Transactions, and Director IndependencePrincipal Accountant Fees and ServicesPARTIVExhibits and Financial Statement SchedulesForm 10-K Summary311232324252526272835366565666667676868686972 PART I CAUTIONARY STATEMENT Statements in this report and the schedules hereto that are not purely historical facts or that necessarily depend upon futureevents, including statements about expected market share gains, forecasted financial performance, industry and business outlook orother statements about anticipations, beliefs, expectations, hopes, intentions or strategies for the future , may be forward-lookingstatements within the meaningofSection 21Eofthe Securities Exchange Actof1934, as amended (the "Exchange Act"). Readers arecautioned no