X0306 4 2021-11-22 0 0001861795 Definitive Healthcare Corp. DH 0001879507 Krantz Jason Ronald C/O DEFINITIVE HEALTHCARE CORP. 550 COCHITUATE RD FRAMINGHAM MA 01701 1 1 1 0 Chief Executive Officer LLC Units of AIDH Topco, LLC 2021-11-22 4 D 0 6959 34.74 D Class A common stock 6959 848130 D LLC Units of AIDH Topco, LLC 2021-11-22 4 D 0 688165 34.74 D Class A common stock 688165 20451027 I By trust Certain unvested awards vest in equal installments on each of the first, second and third anniversaries of the Issuer's initial public offering, and the remainder of the unvested awards continue to vest pursuant to a four-year annual vesting schedule. Once vested, 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. Sold to the Issuer in a transaction exempt pursuant to Rule 16b-3. /s/ David Samuels, as attorney in fact for Jason Krantz 2021-11-24