X0306 4 2022-09-14 0 0001861795 Definitive Healthcare Corp. DH 0001399313 Samuels David M C/O DEFINITIVE HEALTHCARE CORP. 550 COCHITUATE RD FRAMINGHAM MA 01701 0 1 0 0 Chief Legal Officer Class A common stock 2022-09-14 4 F 0 1833 19.45 D 23167 D The transaction reported represents the withholding of shares by the issuer to satisfy the reporting person's tax withholding obligations in connection with the vesting and settlement of previously reported restricted stock units. /s/ David Samuels 2022-09-16