(Markk One)շշANNUAL REPORT PURSUANT TO SECTION 13 ORR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2025ORRննTRANSRRITION REPORT PURSUANT TO SECTION 13 ORR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FORR THETRANSRRITION PERIOD FROMTOCommission File Number 001-40815 Definitive Healthcare Corp. (Exact name off Registrant as specified in its Charter) Registrant’s telephone number, including area code: (508) 720-4224 Securities registeredd ppursuantt to Section 12(b) off the Act: Class A common stock, $0.001 par value Securities registeredd ppursuantt to Section 12(g) off the Act:None Indicate bby checkk markk iff the Registrantt is aa well-known seasonedd issuer, as definff edd in Rule 405 off the Securities Act. YESնNNOշ Indicate bby checkk markk iff the Registrantt is nott requiredd to fileffreports pursuantt to Sectionn 13 orr 15(d) off the Act. YESնNNOշ Indicate bby checkk markk whetherr the Registrant: (1) has fileff dd all reports requiredd to be fileff dd byy Sectionn 13 orr 15(d) off the Securities Exchange Actt off 1934 during theppreceding 12 months (orr forrff such shorterr pperiodd thatt the Registrantt was requiredd to fileffsuch reports), andd (2) has bbeen subju ectt to such filing requirements forrff the pastt 90days. YESշNNOն Indicate bby checkk markk whetherr the Registrantt has submitteddd electronically everyy Irr nteractive Dataa File requiredd to be submittedd pursuantt to RulR e 405 off Regulationnn S-T(§232.405 off this chapter) during the ppreceding 12 months (orr forrff such shorterr pperiodd thatt the Registrantt was requiredd to submitt such files). YESշNNOն Indicate bby checkk markk whetherr the registrantt is aa large acceleratedd filer, ann acceleratedd filer, aa non-acceleratedd filer, smallerr reporting company, orr ann emerging growthhcompany. See the definitions off “large acceleratedd filer,” “acceleratedd filer,” “smallerr reporting company,” andd “emerging growth company” in Rule 12b-2 off theExchange Act. Large acceleratedd filerrնNon-acceleratedd filerrն Smallerr reporting companyշ Emerging growth companyն Iff an emerging growth company, indicate bby checkk markk iff the registrantt has electedd nott to use the extendedd transitionn periodd forrff complying with anyy new orr reviseddfinancial accounting standards pprovidedd ppursuantt to Section 13(a) off the Exchange Act.ն Indicate bby checkk markk whetherr the registrantt has fileff dd aa reportt onn andd attestationn to its management’s assessmentt off the effeff ctiveness off its internal control overrfinancial reporting underr Section 404(b) off the Sarbar nes-Oxley Actt (15 U.S.C. 7262(b)) bby the registeredd ppublic accounting firff m thatt preparedd orr issuedd its auditt report.շ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect thecorrection of an error to previously issued financial statements.նIndicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).ն Indicate bby checkk markk whetherr the Registrantt is aa shell company (as definedd in RulR e 12b-2 off the Exchange Act). YESնNNOշ The aggregate markett value off the Class A common stockk heldd by non-affiff liates off the Registrantt on June 30, 2025, basedd on the reportedd closing price off theRegistra tnt’s Class A common stockk on the NNasdaqq Global Selectt Markett on thatt date, was approximately $153.8 millionn. The numberr off shares off Registrant’s Class A common stockk outstanding as off Februar ry 23, 2026 was 104,472,371. DOCUMENTS INCORPORATRED BY REFERENCEthe 2026 annual meeting off stockholders to bbe fileddd ppursuanttt to Regulation 14A within 120 days afteff rr the registrant’s Portions off the registrant’s pproxy statementt forrfffiscal yearr endedd Decemberr 31, 2025, are incorporratedd bby reference in Partt III off this Form 10-K. Auditor Name: Deloitte & Touche LLPAuditor Location: Boston, MA Auditor Firm Id: PCAOB No. 34 Table off Contents PageGlossaryiCautionary Note Regarding Forward-Looking StatementsiiSummary of Risk Factorsiii PART I Item1.BusinessItem 1A.Risk FactorsItem 1B.Unresolved Staff CommentsItem 1C.CybersecurityItem 2.PropertiesItem 3.Legal ProceedingsItem 4.Mine Safety Disclosures PART IIItem5. Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of EquitySecurities50Item 6.Reserved52Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations53Item 7A.Reserved74Item 8.Financial Statements and Supplementary Data75Item 9.Changes in and Disagreements With Accountants on Accounting and Financial Disclosure75Item 9A.Controls and Procedures75Item 9B.Other Information78