X0407 4 2023-06-01 0 0001861795 Definitive Healthcare Corp. DH 0001645772 Hamood Samuel A 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 32081 D Class A Common Stock 37037 I By AMHAM DH LLC 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. AMHAM DH LLC is an entity solely owned by the Samuel Allen Hamood Revocable Trust dtd Aug. 27, 2010, of which the Reporting Person is a trustee and beneficiary as well as LLC Manager. The Reporting Person has sole voting and dispositive power over the shares held by AMHAM DH LLC. Exhibit 24 - Power of Attorney /s/ Matthew Ruderman, as attorney in fact 2023-06-08