SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* SEA VII Management, LLC (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO CA 94105 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Definitive Healthcare Corp. [ DH ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/17/2021
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	09/17/2021		S		66,857	D	$25.3125	2,885,876(1)(2)(3)(4)	I	See notes(3)(4)(5)
Class B Common Stock	09/17/2021		C		641,983	D	(2)	27,710,989(1)(2)(3)(4)	I	See notes(3)(4)(5)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
LLC Units of AIDH Topco, LLC	(2)	09/17/2021		C(1)			641,983(1)(2)	(6)	(6)	Class A Common Stock	641,983(1)(2)	$25.3125	27,710,989(3)(4)(5)(6)	I(1)	See notes(3)(4)(5)

1. Name and Address of Reporting Person* SEA VII Management, LLC (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO CA 94105 (City) (State) (Zip)

1. Name and Address of Reporting Person* SE VII DHC AIV, L.P. (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO 94105 (City) (State) (Zip)

1. Name and Address of Reporting Person* Spectrum VII Investment Managers' Fund, L.P. (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO 94105 (City) (State) (Zip)

1. Name and Address of Reporting Person* SE VII DHC AIV Feeder, L.P. (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO CA 94105 (City) (State) (Zip)

1. Name and Address of Reporting Person* Spectrum VII Co-Investment Fund, L.P. (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO CA 94105 (City) (State) (Zip)

1. Name and Address of Reporting Person* Spectrum Equity Associates VII, L.P. (Last) (First) (Middle) 140 NEW MONTGOMERY STREET, 20TH FLOOR (Street) SAN FRANCISCO CA 94105 (City) (State) (Zip)

Explanation of Responses:

1. See Exhibit 99.1 for text of footnote (1).

2. See Exhibit 99.1 for text of footnote (2).

3. See Exhibit 99.1 for text of footnote (3).

4. See Exhibit 99.1 for text of footnote (4).

5. See Exhibit 99.1 for text of footnote (5).

6. See Exhibit 99.1 for text of footnote (6).

Remarks:

Christopher T. Mitchell, a Managing Director of Spectrum and Jeffrey C. Haywood, a Managing Director of Spectrum (together, the "Spectrum Directors"), each serve on the board of directors of the Issuer, and have been deputized to represent the Reporting Persons on the board of directors. By virtue of the Spectrum Directors' representation, for purposes of Section 16 of the Securities Exchange Act of 1934, each of the Reporting Persons may be deemed directors by deputization of the Issuer. The Spectrum Directors have filed separate Section 16 reports disclosing securities of the Issuer that they may be deemed to beneficially own for Section 16 purposes. Exhibit 99.1 (Footnotes to Form 4).

	SEA VII MANAGEMENT, LLC, By: /s/ Carolina A. Picazo, Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	SE VII DHC AIV, L.P., By: Spectrum Equity Associates VII, L.P., its general partner, By: SEA VII Management, LLC, its general partner, By: /s/Carolina A. Picazo, its Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	SE VII DHC AIV FEEDER, L.P., By: Spectrum Equity Associates VII, L.P., its general partner, By: SEA Management, LLC, its general partner, By: /s/ Carolina A. Picazo, Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	SPECTRUM VII INVESTMENT MANAGERS' FUND, L.P., By: SEA Management, LLC, its general partner, By: /s/ Carolina A. Picazo, Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	SPECTRUM VII CO-INVESTMENT FUND, L.P., By: /s/ Carolina A. Picazo, Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	SPECTRUM EQUITY ASSOCIATES VII, L.P., By: SEA Management, LLC, its general partner, By: /s/ Carolina A. Picazo, Chief Administrative Officer & Chief Compliance Officer	09/21/2021
	** 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 4 (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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                                                                    Exhibit 99.1

                                Explanatory Note

                              Footnotes to Form 4

(1) On September 15, 2021, the Issuer used the proceeds from the underwriters'
exercise of their option to purchase additional shares to repurchase at a price
of $25.3125 per share or unit, as applicable, (a) 66,857 shares of Class A
common stock from SE VII DHC AIV Feeder, L.P. ("Spectrum Feeder"), and to
purchase (b) an aggregate of 641,983 LLC Units of AIDH Topco, LLC ("LLC Units"),
including (i) 640,508 LLC Units from SE VII DHC AIV, L.P. ("SE VII DHC AIV");
(ii) 931 LLC Units from Spectrum VII Investment Managers Fund, L.P. ("Spectrum
Investment Managers Fund"); and (iii) 544 LLC Units from Spectrum VII Co-
Investment Fund, L.P. ("Spectrum VII Co-Investment Fund" and, together with
Spectrum Feeder, SE VII DHC AIV, Spectrum Investment Managers' Fund and Spectrum
VII Co-Investment Fund, the "Spectrum Funds"). This transaction was approved by
the board of directors of the Issuer for purposes of Rule 16b-3 of the
Securities Exchange Act of 1934, as amended.

(2) The Exchange Agreement permits holders of LLC Units to exchange their LLC
Units for shares of Class A Common Stock on a one-for-one basis, subject to
certain exceptions, conditions and adjustments. 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.

(3) Following the reported transactions, SEA VII Management, LLC ("Spectrum")
manages the Spectrum Funds that collectively own 2,885,876 shares of Class A
common stock of the Issuer and 27,710,989 shares of Class B common stock of the
Issuer, which are represented as follows: (i) 2,885,876 shares of Class A common
stock held directly by Spectrum Feeder, (ii) 27,647,349 shares of Class B common
stock held directly by SE VII DHC AIV; (iii) 40,173 shares of Class B common
stock held directly by Spectrum Investment Managers Fund; and (iv) 23,467 shares
of Class B common stock held directly by Spectrum VII Co-Investment Fund" and,
together with Spectrum Feeder, SE VII DHC AIV, Spectrum Investment Managers'
Fund and Spectrum VII Co-Investment Fund, the "Spectrum Funds").

(4) SEA VII Management, LLC is the general partner of Spectrum Equity Associates
VII, L.P., which in turn is the general partner of the Spectrum Funds.

(5) Each Reporting Person disclaims Section 16 beneficial ownership of the
shares reported herein except to the extent of its pecuniary interest therein,
if any, and the inclusion of these shares in this report shall not be deemed an
admission of beneficial ownership of any of the reported shares for purposes of
Section 16 or any other purpose.

(6) The Reporting Person may exchange the LLC Units 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 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.