Sec Form 4 Filing - Winn David Randall @ Definitive Healthcare Corp. - 2022-08-08

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Winn David Randall 2. Issuer Name and Ticker or Trading Symbol Definitive Healthcare Corp. [ DH] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 7900 GLADES ROAD, SUITE 540 3. Date of Earliest Transaction (MM/DD/YY) 08/08/2022 (Street) BOCA RATON, FL33434 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 08/08/2022 C 1,948,960 A 1,948,960 I( 1 ) By 22C Capital I, L.P.( 1 ) Class A Common Stock 08/08/2022 C 5,763 A 5,763 I( 1 ) By 22C AIDH AIV LLC( 1 ) Class A Common Stock 08/08/2022 S 245,277 D $ 24.025 275,650 I( 1 ) By 22C Capital I-A, L.P.( 1 ) Class A Common Stock 08/08/2022 S 1,948,960 D $ 24.025 0 I( 1 ) By 22C Capital I, L.P.( 1 ) Class A Common Stock 08/08/2022 S 5,763 D $ 24.025 0 I( 1 ) By 22C AIDH AIV LLC( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares LLC Units of AIDH Topco, LLC ( 2 ) 08/08/2022 C 1,948,960 ( 2 ) ( 2 ) Class A Common Stock 1,948,960 $ 0 2,190,307 I( 1 ) By 22C Capital I, L.P.( 1 ) LLC Units of AIDH Topco, LLC ( 2 ) 08/08/2022 C 5,763 ( 2 ) ( 2 ) Class A Common Stock 5,763 $ 0 6,476 I( 1 ) By 22C AIDH AIV LLC( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Winn David Randall 7900 GLADES ROAD SUITE 540 BOCA RATON, FL33434 X Signatures /s/ David Randall Winn 08/10/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )22C Capital GP I, L.L.C. is the general partner of 22C Capital I, L.P. and 22C Capital I-A, L.P. and is the sole member of 22C AIDH AIV LLC. 22C Capital GP I MM LLC is the managing member of 22C Capital GP I, L.L.C. The Reporting Person is one of the co-members of 22C Capital GP I MM LLC and, in such capacity, may be deemed to exercise voting or investment power over the shares of Class A common stock and LLC Units of AIDH Topco held directly by each of 22C Capital I, L.P., 22C Capital I-A, L.P. and 22C AIDH AIV LLC. ( 2 )The Reporting Person may exchange LLC Units of AIDH Topco, LLC for shares of Class A Common Stock of the Issuer on a one-for-one basis, subject to certain exceptions, conditions and adjustments. The LLC Units of AIDH Topco, LLC have no expiration date. At the time of any such exchange, an equal number of shares of Class B Common Stock of the Issuer held by the Reporting Person, which have no economic value and entitle holders thereof to one vote per share on all matters on which stockholders of the Issuer are entitled to vote generally, are cancelled.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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