X0306 4 2022-05-24 0 0001861795 Definitive Healthcare Corp. DH 0001738092 Larsen Jill C/O DEFINITIVE HEALTHCARE CORP. 550 COCHITUATE RD FRAMINGHAM MA 01701 1 0 0 0 Class A Common Stock 2022-05-24 4 A 0 14545 A 14545 D Represents shares of the Issuer's Class A Common Stock, par value $0.001 (the "Class A Common Stock") issuable pursuant to restricted stock units ("RSUs") as follows: (i) 4,475 immediately vested RSUs issued in respect of the Reporting Person's pro-rated service as a director since the Issuer's IPO, and (ii) 10,070 RSUs which vest upon the earlier of May 24, 2023 or the Issuer's next annual shareholder meeting, subject to the Reporting Person's continued service with the Issuer through the vesting date and subject to earlier forfeiture or acceleration. /s/ David Samuels, as attorney in fact 2022-05-26