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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* SUMMIT PARTNERS L P (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 10/28/2021	3. Issuer Name and Ticker or Trading Symbol Solo Brands, Inc. [ DTC ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. 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 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, $0.001 par value per share	29,867,378	I	See Footnote(1)(2)
Class B Common Stock, $0.001 par value per share	14,167,582	I	See Footnote(3)

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
Common Units	(3)	(3)	Class A Common Stock	14,167,582	(3)	I	See Footnote(3)

1. Name and Address of Reporting Person* SUMMIT PARTNERS L P (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Summit Partners Growth Equity Fund X-A, L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Summit Partners Growth Equity Fund X-B, L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Summit Partners Growth Equity Fund X-C, L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SUMMIT INVESTORS X, LLC (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SUMMIT INVESTORS X (UK), L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Summit Partners Subordinated Debt Fund V-A, L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* Summit Partners Subordinated Debt Fund V-B, L.P. (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* SP-SS AGGREGATOR LLC (Last) (First) (Middle) 222 BERKELEY STREET, 18TH FLOOR (Street) BOSTON MA 02116 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Represents 11,304,941, 17,271,224, 466,295, 569,102, 201,182, 50,735, and 3,899 shares of Class A common stock held directly by Summit Partners Growth Equity Fund X-A, L.P., Summit Partners Growth Equity Fund X-B, L.P., Summit Partners Growth Equity Fund X-C, L.P., Summit Partners Subordinated Debt Fund V-A, L.P., Summit Partners Subordinated Debt Fund V-B, L.P., Summit Investors X, LLC, and Summit Investors X (UK), L.P., respectively. Summit Partners, L.P. is the managing member of Summit Partners GE X, LLC, which is the general partner of Summit Partners GE X, L.P., the general partner of each of Summit Partners Growth Equity Fund X-A, L.P., Summit Partners Growth Equity Fund X-B, L.P., and Summit Partners Growth Equity Fund X-C, L.P. Summit Partners, L.P. also is the managing member of Summit Partners SD V, LLC, which is the general partner of Summit Partners SD V, L.P.,

2. (continued from footnote 1) the general partner of each of Summit Partners Subordinated Debt Fund V-A, L.P. and Summit Partners Subordinated Debt Fund V-B, L.P. Summit Master Company, LLC is the sole managing member of Summit Investors Management, LLC, which is (A) the manager of Summit Investors X, LLC, and (B) the general partner of Summit Investors X (UK), L.P. Summit Master Company, LLC, as the managing member of Summit Investors Management, LLC, has delegated investment decisions, including voting and dispositive power, to Summit Partners, L.P. and its Investment Committee.

3. Represents shares of Class B common stock (and associated common membership interests in Solo Stove Holdings, LLC ("Common Units")) held directly by SP-SS Aggregator LLC. SP-SS Aggregator LLC is managed by a manager appointed by the members holding a majority of the interests of the entity, which manager is currently designated to be Summit Partners Growth Equity Fund X-A, L.P. Shares of Class B common stock of the Issuer confer no economic rights on the holders thereof. Holders of shares of Class B common stock will be entitled to one vote per share on all matters to be voted on by holders of the Issuer's shares of Class A common stock. Upon exchange of Common Units reported in Table II hereof, an equal number of shares of Class B common stock will be delivered to the Issuer and cancelled for no consideration. Common Units do not expire.

Remarks:

	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-A, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-B, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-C, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Subordinated Debt Fund V-A, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Subordinated Debt Fund V-B, L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Investors X, LLC	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for Summit Investors X (UK), L.P.	10/28/2021
	/s/ Adam H. Hennessey, as attorney-in-fact for SP-SS Aggregator LLC	10/28/2021
	** 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 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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