X0407 4 2023-06-01 0 0001861795 Definitive Healthcare Corp. DH 0001943932 Chilukuri Sastry C/O DEFINITIVE HEALTHCARE CORP. 492 OLD CONNECTICUT PATH, SUITE 401 FRAMINGHAM MA 01701 1 0 0 0 0 Class A Common Stock 2023-06-01 4 A 0 17536 0.00 A 44124 D Represents restricted stock units ("RSUs"), each representing a contingent right to receive one share of the Issuer's Class A Common Stock, par value $0.001, vesting on the earlier of June 1, 2024 or the date of the Issuer's next annual meeting of stockholders, subject to the Reporting Person's continued service through the applicable vesting date. /s/ Matthew Ruderman, as attorney in fact 2023-06-08