Definitive Healthcare Corp. (Exact name of Registrant as specified in its Charter) Securities registered pursuant to Section 12(b) of the Act: Class A Common Stock, $0.001 par value Securities registered pursuant to Section 12(g) of the Act:None Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES☐NO☒ 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 of 1934 during thepreceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90days. YES☒NO☐ Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T(§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such 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, or an emerging growthcompany. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of theExchange Act. Large accelerated filer☐Non-accelerated filer☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revisedfinancial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control overfinancial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☒ 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.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of theregistrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES☐NO☒ The aggregate market value of the Class A Common Stock held by non-affiliates of the Registrant on June 28, 2024, based on the reported closing price of theRegistrant’s Class A Common Stock on the Nasdaq Global Select Market on that date, was approximately $284.4 million. The number of shares of Registrant’s Class A Common Stock outstanding as of February 24, 2025 was 112,911,325. DOCUMENTS INCORPORATED BY REFERENCEPortions of the registrant’s proxy statement for the 2025 annual meeting of stockholders to be filed pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2024, are incorporated by reference in Part III of this Form 10-K. Auditor Firm Id: PCAOB No. 34 Auditor Location: Boston, MA Table of Contents PART IItem 1. Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of EquitySecurities51Item 6.Reserved53Item 7.Management’s Discussion and Analysis of Financial Condition and Results of Operations54Item 7A.Quantitative and Qualitative Disclosures About Market Risk76Item 8.Financial Statements and Supplementary Data77Item 9.Changes in and Disagreements With Accountants on Accounting and Financial Disclosure77Item 9A.Controls and Procedures77Item 9B.Other Information80Item 9C.Disclosure Regarding Foreign Jurisdictions that Prevent Inspections80 PART III Item 10.Directors, Executive Officers and Corporate Governance81Item 11.Executive Compensation81Item 12.Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters81Item 13.Certain Relationships and Related Transactions and Director Independence81Item 14.Principal Accounting Fees and Services81 PART IV Item 15.Exhibits and Financial Statement Schedules82Item 16.Form 10-K Summary85Signatures86 GLOSSARY As used in this Annual Report on Form 10-K, the terms identified below have the meanings specified below unlessotherwise noted or the context indicates otherwise. References in this Form 10-K to “Definitive Healthcare Corp.” refer toDefinitive Healthcare Corp. and not to any of its subsidiaries unless the context indicates otherwise. References in this Form10-K to “Definitive Healthcare,” "Definitive," the “Company,” “we,” “us,” and “our” refer (1) prior to the consummation ofthe Reorganization Transactions, to Defini