Form 4 Filing for Graboske Benjamin

This filing details a transaction by Graboske Benjamin, EVP, Chief Data Officer of Definitive Healthcare Corp. On December 22, 2025, Benjamin Graboske disposed of 341,417 shares of Class A Common Stock at a price of $2.53 per share, resulting in a post-transaction holding of 676,913 shares. The shares disposed of were to satisfy tax withholding obligations in connection with the vesting of restricted stock units previously granted under the Definitive Healthcare Corp. 2023 Inducement Plan. The vesting was accelerated by the company's Human Capital Management and Compensation Committee and Board of Directors. The filing also includes a Power of Attorney document authorizing representatives to execute and file necessary SEC forms on behalf of the reporting person.