DH

SEC source: 0001193125-26-414095 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,785,960

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-414092 · ownership.xml · nonDerivative · entry 1

Paris Jonathan · CIK 0001866482 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 864,534

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-381870 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,798,502

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-332758 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,189,272

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-332755 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,839,595

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-296167 · ownership.xml · nonDerivative · entry 1

Paris Jonathan · CIK 0001866482 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 872,263

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-296168 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,975,229

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-262529 · ownership.xml · nonDerivative · entry 1

Stephenson Scott G · CIK 0001472708 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 313,314

F1 · shares: 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 4, 2027 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.

SEC source: 0001193125-26-261833 · ownership.xml · nonDerivative · entry 1

Chilukuri Sastry · CIK 0001943932 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 315,984

F1 · shares: 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 4, 2027 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.

SEC source: 0001193125-26-261948 · ownership.xml · nonDerivative · entry 1

Winters Kathleen A · CIK 0001468300 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 308,982

F1 · shares: 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 4, 2027 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.

SEC source: 0001193125-26-263150 · ownership.xml · nonDerivative · entry 1

Hamood Samuel A · CIK 0001645772 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 289,396

F1 · shares: 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 4, 2027 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.

SEC source: 0001193125-26-255409 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,841,476

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-255405 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,012,822

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-206353 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,201,438

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-206349 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,005,853

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-142181 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,213,604

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-142183 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,078,872

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-088137 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,116,465

F1 · shares: 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 RSUs.

SEC source: 0001193125-26-077183 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,258,758

F1 · shares: 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, with 100% of the RSUs vesting on March 1, 2027, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001193125-26-077209 · ownership.xml · nonDerivative · entry 1

Graboske Benjamin · CIK 0002052028 · EVP, Chief Data Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,312,026.654

F1 · shares: 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, with 25% of the RSUs vesting on March 1, 2027, followed by vesting of 6.25%

SEC source: 0001193125-26-077200 · ownership.xml · nonDerivative · entry 1

Paris Jonathan · CIK 0001866482 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 902,854

F1 · shares: 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, with 25% of the RSUs vesting on March 1, 2027, followed by vesting of 6.25% every three months thereafter over the subsequent three years, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001193125-26-077194 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,007,322

F1 · shares: 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, with 25% of the RSUs vesting on March 1, 2027, followed by vesting of 6.25% every three months thereafter over the subsequent three years, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001193125-26-077188 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,291,989

F1 · shares: 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, with 25% of the RSUs vesting on March 1, 2027, followed by vesting of 6.25% every three months thereafter over the subsequent three years, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001193125-26-035552 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,016,039

F1 · kind: 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.

SEC source: 0001193125-26-035486 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,274,021

F1 · kind: 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 RSUs.

SEC source: 0001193125-26-006286 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,275,490

F1 · shares: 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 (the "Class A Common Stock"), with 50% of the RSUs vesting on January 1, 2027, followed by vesting in equal quarterly installments over the remaining 12 months thereafter, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001193125-26-002396 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,556,552

F1 · kind: 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.

SEC source: 0001193125-25-330842 · ownership.xml · nonDerivative · entry 1

Graboske Benjamin · CIK 0002052028 · EVP, Chief Data Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 676,913

F1 · kind: 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.

F2 · shares: Represents RSUs granted under the Definitive Healthcare Corp. 2023 Inducement Plan. In December 2025, the Definitive Healthcare Corp. Human Capital Management and Compensation Committee and Board of Directors approved the acceleration of the unvested shares underlying this grant, resulting in the award becoming 100% vested as of December 22, 2025.

SEC source: 0001193125-25-264629 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,060,584

F1 · kind: 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.

SEC source: 0001193125-25-264633 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,080,177

F1 · kind: 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.

SEC source: 0001193125-25-229270 · ownership.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,081,421

F1 · kind: 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.

SEC source: 0001193125-25-229266 · ownership.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,584,788

F1 · kind: 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.

SEC source: 0001193125-25-204984 · ownership.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,079,380

F1 · kind: 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.

SEC source: 0001415889-25-021082 · form4-08052025_100843.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,083,473

F1 · kind: 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.

SEC source: 0001415889-25-021085 · form4-08052025_100821.xml · nonDerivative · entry 1

Shamsuddin Kate Marie · CIK 0001878756 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 694,149

F1 · kind: 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.

SEC source: 0001415889-25-021086 · form4-08052025_100859.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,089,721

F1 · kind: 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.

SEC source: 0001415889-25-019060 · form4-07022025_040712.xml · nonDerivative · entry 1

Paris Jonathan · CIK 0001866482 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 421,349

F1 · shares: 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, with 25% of the RSUs vesting on July 1, 2026, followed by vesting of 6.25% every three months thereafter over the subsequent three years, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001415889-25-019309 · form4-07032025_040715.xml · nonDerivative · entry 1

Coop Kevin · CIK 0001912728 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,622,381

F1 · kind: 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.

SEC source: 0001415889-25-017562 · form4-06172025_090604.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,102,269

F1 · kind: 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.

SEC source: 0001415889-25-017565 · form4-06172025_090625.xml · nonDerivative · entry 1

Shamsuddin Kate Marie · CIK 0001878756 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 698,890

F1 · kind: 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.

SEC source: 0001415889-25-016677 · form4-06112025_040617.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,090,965

F1 · shares: 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 (the "Class A Common Stock"), with 25% of the RSUs vesting on June 1, 2026, followed by vesting of 6.25% every three months thereafter over the subsequent three years, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001415889-25-016335 · form4-06092025_090622.xml · nonDerivative · entry 1

Chilukuri Sastry · CIK 0001943932 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 126,794

F1 · shares: 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 5, 2026 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.

SEC source: 0001415889-25-016332 · form4-06092025_090639.xml · nonDerivative · entry 1

Stephenson Scott G · CIK 0001472708 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 124,124

F1 · shares: 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 5, 2026 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.

SEC source: 0001415889-25-016334 · form4-06092025_090620.xml · nonDerivative · entry 1

Winters Kathleen A · CIK 0001468300 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 119,792

F1 · shares: 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 5, 2026 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.

SEC source: 0001415889-25-016333 · form4-06092025_090658.xml · nonDerivative · entry 1

Larsen Jill · CIK 0001738092 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,751

F1 · shares: 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 5, 2026 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.

SEC source: 0001415889-25-016331 · form4-06092025_090604.xml · nonDerivative · entry 1

Hamood Samuel A · CIK 0001645772 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,206

F1 · shares: 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 5, 2026 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.

SEC source: 0001415889-25-015595 · form4-06042025_080658.xml · nonDerivative · entry 1

Heller Casey · CIK 0002052043 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 605,084

F1 · shares: 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, with 50% of the RSUs vesting on June 1, 2026, followed by vesting of 12.5% every three months thereafter over the subsequent twelve months, subject to the Reporting Person's continued service with the Issuer through each such vesting date.

SEC source: 0001415889-25-011964 · form4-05052025_040508.xml · nonDerivative · entry 1

Krantz Jason Ronald · CIK 0001879507 · Director · 10% owner · EXECUTIVE CHAIRMAN

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,106,362

F1 · kind: 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.

SEC source: 0001415889-25-011963 · form4-05052025_040506.xml · nonDerivative · entry 1

Shamsuddin Kate Marie · CIK 0001878756 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 699,902

F1 · kind: 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.

SEC source: 0001415889-25-011962 · form4-05052025_040504.xml · nonDerivative · entry 1

Booth Richard Douglas · CIK 0001641054 · CHIEF FINANCIAL OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 652,630.173

F1 · kind: 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.