SUMMIT PARTNERS L P - 01 Jan 2026 Form 4 Insider Report for Solo Brands, Inc. (DTCB)

Reporting relationship: 10%+ Owner
Issuer ticker: DTCB
Reported as of: 01 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Jan 2026, 16:05:05 UTC
Prior SEC filing: 10 Sep 2025
Source filing: View source filing
Reporting owner signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners, L.P.

Key filing fact

SUMMIT PARTNERS L P filed Form 4 for Solo Brands, Inc. (DTCB) on 05 Jan 2026.

Key facts

This page summarizes SUMMIT PARTNERS L P's Form 4 filing for Solo Brands, Inc. (DTCB).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Jan 2026, 16:05.

Change

Previous filing in this sequence was filed on 10 Sep 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (9)

CIK 0000830588 Primary reporting owner

SUMMIT PARTNERS L P

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners, L.P.
Signature date: 05 Jan 2026

CIK 0001757901

Summit Partners Growth Equity Fund X-A, L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-A, L.P.
Signature date: 05 Jan 2026

CIK 0001757905

Summit Partners Growth Equity Fund X-B, L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-B, L.P.
Signature date: 05 Jan 2026

CIK 0001764048

Summit Partners Growth Equity Fund X-C, L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Growth Equity Fund X-C, L.P.
Signature date: 05 Jan 2026

CIK 0001777794

SUMMIT INVESTORS X, LLC

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Subordinated Debt Fund V-A, L.P.
Signature date: 05 Jan 2026

CIK 0001848077

SUMMIT INVESTORS X (UK), L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Partners Subordinated Debt Fund V-B, L.P.
Signature date: 05 Jan 2026

CIK 0001717868

Summit Partners Subordinated Debt Fund V-A, L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Investors X, LLC
Signature date: 05 Jan 2026

CIK 0001717713

Summit Partners Subordinated Debt Fund V-B, L.P.

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for Summit Investors X (UK), L.P.
Signature date: 05 Jan 2026

CIK 0001889449

SP-SS AGGREGATOR LLC

Relationship: 10%+ Owner
Address: 222 BERKELEY STREET, 18TH FLOOR, BOSTON
Signature: /s/ Adam H. Hennessey, as attorney-in-fact for SP-SS Aggregator LLC
Signature date: 05 Jan 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SBDS transaction

Class A Common Stock, $0.001 par value per share

Conversion of derivative security

Transaction value
Shares: +354,189
Change %: +47%
Price
Shares after: 1,100,870
Date: 01 Jan 2026
Ownership: See Footnotes
Footnotes: F1, F2, F3

SBDS transaction

Class B Common Stock, $0.001 par value per share

Other

Transaction value
Shares: -354,189
Change %: -100%
Price
Shares after: 0
Date: 01 Jan 2026
Ownership: See Footnotes
Footnotes: F1, F2, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SBDS transaction Derivative

Common Units

Conversion of derivative security

Transaction value: $0
Shares: -354,189
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 01 Jan 2026
Ownership: See Footnotes
Underlying class: Class A Common Stock
Underlying amount: 354,189
Exercise price
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

On December 17, 2025, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with its subsidiaries Solo Stove Holdings, LLC ("Holdings") and Solo Merger Sub LLC ("Merger Sub"), whereby effective January 1, 2026, Merger Sub merged with and into Holdings, with Holdings continuing as the surviving entity as a wholly owned subsidiary of the Issuer (the "Merger"). Pursuant to the Merger Agreement, on January 1, 2026, each of the issued and outstanding common membership interests in Holdings beneficially owned by members of Holdings was cancelled and converted automatically into a right to receive one share of Class A Common Stock. In addition, immediately following the effective time of the Merger, all of the issued and outstanding shares of Class B Common Stock were retired and cancelled in accordance with the Issuer's Amended and Restated Certificate of Incorporation and Holdings' Amended and Restated Limited Liability Company Agreement.

Footnote F2

Represents 282,623, 431,780, 11,657, 14,227, 5,029, 1,268, 97 and 354,189 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, Summit Investors X (UK), L.P. and SP-SS Aggregator LLC, 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.,

Footnote F3

(continued from footnote 2) 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. 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.