Definitive Healthcare (DH) EVP corrects Form 3, discloses 4,045.654 shares

Rhea-AI Filing Summary

Definitive Healthcare Corp. executive updates initial ownership report. EVP and Chief Data Officer Benjamin Graboske filed an amended Form 3 to reflect beneficial ownership of 4,045.654 shares of Class A Common Stock. A footnote explains these shares were mistakenly omitted from his original Form 3 and from two subsequent Forms 4.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Graboske Benjamin

(Last) (First) (Middle)

C/O DEFINITIVE HEALTHCARE CORP.

492 OLD CONNECTICUT PATH, SUITE 401

(Street)

FRAMINGHAM MA 01701

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
02/24/2026

3. Issuer Name and Ticker or Trading Symbol
Definitive Healthcare Corp. [ DH ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Data Officer

5. If Amendment, Date of Original Filed (Month/Day/Year)
03/04/2025

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	4,045.654(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. These shares were omitted from the reporting person's original Form 3, and also were omitted from two Forms 4 filed by the reporting person after his original Form 3 was filed.

	/s/ Jonathan Paris, Attorney-in-Fact	02/26/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What does Definitive Healthcare (DH) insider Benjamin Graboske report in this amended Form 3?

The amended Form 3 reports that Benjamin Graboske beneficially owns 4,045.654 shares of Class A Common Stock. This corrects earlier filings where these shares were not included, aligning his disclosed holdings with his actual ownership position at Definitive Healthcare Corp.

Did Benjamin Graboske buy or sell Definitive Healthcare (DH) shares in this Form 3/A?

The Form 3/A does not report a new purchase or sale. It is an amendment to correct previously reported holdings, adding 4,045.654 Class A shares that were omitted from the original Form 3 and from two later Forms 4 filed by Graboske.

Why was an amendment to Benjamin Graboske’s Definitive Healthcare (DH) Form 3 necessary?

An amendment was necessary because 4,045.654 Class A shares were left out of Graboske’s original Form 3. The footnote also states these shares were omitted from two subsequent Forms 4, so this filing brings his SEC-reported ownership information up to date.

How many Definitive Healthcare (DH) shares does Benjamin Graboske now report owning?

He now reports owning 4,045.654 shares of Class A Common Stock directly. This figure reflects the corrected total after adding shares that were previously omitted from his initial Form 3 and from two later Forms 4 relating to his ownership.

Does the Benjamin Graboske Form 3/A for Definitive Healthcare (DH) indicate indirect ownership?

The filing classifies the 4,045.654 Class A shares as directly owned. The ownership code is reported as direct, and the nature of ownership field does not describe any trust, partnership, or other indirect entity holding these shares on Graboske’s behalf.