on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Regulation FD Disclosure. As previously disclosed, Definitive Healthcare Corp. (the “Company”) is party to a tax receivable agreement, dated as of September 14, 2021 (the “TRA”), with AIDH TopCo, LLC, certain affiliates of Advent International, L.P. (collectively, “Advent”), certain affiliates of Spectrum Equity Management, L.P. (collectively, “Spectrum Equity”), certain affiliates of 22C Capital LLC (collectively, “22C Capital”), Jason Krantz (“Mr. Krantz”), and certain other parties thereto…

CEO — Clay Ritchey: The filing announces the appointment of a new external CEO, which is a significant management change but not a departure of a sitting executive.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On June 18, 2026, Definitive Healthcare Corp. (the “Company”) received written notice (the “Notice”) from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, based upon the closing bid price of the Company’s common stock (Nasdaq symbol: DH) for the 30 consecutive business days from May 6, 2026 to June 17, 2026, the Company no longer meets…

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Termination of a Material Definitive Agreement. Definitive Healthcare Corp. (the “Company”) and SE VII DHC AIV, L.P. (“Spectrum”), were parties to a Nominating Agreement, dated September 17, 2021 (the “Nominating Agreement”). The Nominating Agreement provides that, so long as Spectrum and/or its Affiliates were the Beneficial Owner of at least 5% of the total number of shares of Common Stock outstanding, the Nominating Agreement granted Spectrum, among other things, the right to designate one…

Director — Jeff Haywood: Mr. Haywood resigned from the Board of Directors and as a member of the Human Capital Management and Compensation Committee.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Director and Chair of the Human Capital Management and Compensation Committee — Jill Larsen: Ms. Larsen resigned due to increased responsibilities at her present employer.

Chief Operating Officer — Kate Shamsuddin Jensen: The COO position was eliminated, resulting in a termination without cause.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

CFO — Casey Heller: Casey Heller was promoted to CFO, succeeding Richard Booth.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Entry into a Material Definitive Agreement. On January 16, 2025 (the “Closing Date”), Definitive Healthcare Holdings, LLC, a Delaware limited liability company (“DHH”), an indirect subsidiary of Definitive Healthcare Corp., a Delaware corporation (the “Company”), entered into an amendment to the credit agreement (the “DHH Credit Agreement Amendment”), dated as of September 17, 2021 (as amended by that certain Amendment No. 1, dated as of October 31, 2022, and as further amended, supplemented…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Chief Financial Officer — Richard Booth: Mr. Booth is leaving the Company effective June 1, 2025.

Other Events On November 1, 2024, the Company’s Board of Directors authorized a stock repurchase program of up to $100.0 million of its Class A Common Stock, which expires on December 31, 2025 (the “Repurchase Program”), which will take effect upon the expiration or completion of the Company’s previously announced $20.0 million stock repurchase program. Repurchases may be effected, from time to time, either on the open market (including pre-set trading plans), in privately negotiated transact…

Chief Operating Officer — Kate Shamsuddin Jensen: Ms. Shamsuddin Jensen was promoted to Chief Operating Officer.

on this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, regardless of any general incorporation language in such filing.

Results of Operations and Financial Condition Preliminary Financial Results for the Three Months Ended June 30, 2024 (unaudited) On July 30, 2024, Definitive Healthcare Corp. (“Definitive Healthcare” or the “Company”) announced selected preliminary results for the quarter ended June 30, 2024. Second Quarter 2024 Preliminary Results: • Revenue is expected to be $63.7 million, an increase of 5% from $61.0 million in Q2 2023. • Operating Loss is expected to be $(369.6) million, inclusive of a $3…

Chief Revenue Officer — Carrie Lazorchak: The resignation of the Chief Revenue Officer without a named successor is a significant loss for the company.