Monte Rosa Therapeutics, Inc. has a large shareholder group reporting passive ownership of its common stock. Dimension Capital I, L.P. directly holds 5,663,265 shares of common stock, and together with affiliated entities and individuals Adam Goulburn, Zavain Dar, and Nan Li, this position represents 8.7% of the company’s outstanding shares.
The ownership percentage is calculated using 65,117,761 shares of common stock outstanding as of October 31, 2025, as disclosed in Monte Rosa’s Form 10-Q. The reporting group certifies that the securities were not acquired and are not held for the purpose of changing or influencing control of Monte Rosa, indicating a passive investment stance rather than an activist position.
Positive
None.
Negative
None.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
Monte Rosa Therapeutics, Inc.
(Name of Issuer)
Common Stock, par value $0.0001 per share
(Title of Class of Securities)
61225M102
(CUSIP Number)
12/31/2025
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Adam Goulburn
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
AUSTRALIA
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Zavain Dar
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Nan Li
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Dimension Management, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Dimension Capital I GP, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
CO
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Dimension Management GP, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
CO
SCHEDULE 13G
CUSIP No.
61225M102
1
Names of Reporting Persons
Dimension Capital I, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
5,663,265.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
5,663,265.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,663,265.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
8.7 %
12
Type of Reporting Person (See Instructions)
PN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Monte Rosa Therapeutics, Inc.
(b)
Address of issuer's principal executive offices:
321 Harrison Avenue, Suite 900, Boston, MA 02118
Item 2.
(a)
Name of person filing:
The names of the persons filing this report (collectively, the "Reporting Persons") with respect to shares of Common Stock, par value $0.0001 per share (the "Common Stock") of Monte Rosa Therapeutics, Inc. (the "Issuer") are:
Adam Goulburn
Zavain Dar
Nan Li
Dimension Management, L.P. ("Dimension Management")
Dimension Capital I GP, LLC ("Dimension Capital I GP")
Dimension Management GP, LLC ("Dimension Management GP")
Dimension Capital I, L.P. ("Dimension Capital I")
(b)
Address or principal business office or, if none, residence:
The address of the principal business office of each of the Reporting Persons is 632 Broadway, Suite 801, New York, NY 10012.
(c)
Citizenship:
Mr. Goulburn is an Australian citizen. Each of Mr. Dar and Mr. Li is a United States citizen. Each of Dimension Management and Dimension Capital is a Delaware limited partnership. Each of Dimension Capital I GP and Dimension Management GP is a Delaware limited liability company.
(d)
Title of class of securities:
Common Stock, par value $0.0001 per share
(e)
CUSIP No.:
61225M102
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by this item with respect to each Reporting Person is set forth in Rows 5 through 9 of the cover pages to this Schedule 13G. The ownership percentages reported are based on 65,117,761 outstanding shares of Common Stock as of October 31, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 6, 2025.
Dimension Capital I directly holds 5,663,265 shares of Common Stock. Dimension Management is the investment advisor to Dimension Capital I, and Dimension Management GP is the general partner of Dimension Management. Dimension Capital I GP is the general partner to the general partner of Dimension Capital I. Mr. Goulburn, Mr. Dar, and Mr. Li are members of each of Dimension Management GP and Dimension Capital I GP.
(b)
Percent of class:
The information required by this item with respect to each Reporting Person is set forth in Row 11 of the cover pages to this Schedule 13G.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by this item with respect to each Reporting Person is set forth in Row 5 of the cover pages to this Schedule 13G.
(ii) Shared power to vote or to direct the vote:
The information required by this item with respect to each Reporting Person is set forth in Row 6 of the cover pages to this Schedule 13G.
(iii) Sole power to dispose or to direct the disposition of:
The information required by this item with respect to each Reporting Person is set forth in Row 7 of the cover pages to this Schedule 13G.
(iv) Shared power to dispose or to direct the disposition of:
The information required by this item with respect to each Reporting Person is set forth in Row 8 of the cover pages to this Schedule 13G.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
Not Applicable
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Adam Goulburn
Signature:
/s/ Adam Goulburn
Name/Title:
Adam Goulburn
Date:
01/21/2026
Zavain Dar
Signature:
/s/ Zavain Dar
Name/Title:
Zavain Dar
Date:
01/21/2026
Nan Li
Signature:
/s/ Nan Li
Name/Title:
Nan Li
Date:
01/21/2026
Dimension Management, L.P.
Signature:
/s/ Adam Goulburn
Name/Title:
By: Dimension Management GP, LLC, its general partne; By: Adam Goulburn, Member
Date:
01/21/2026
Dimension Capital I GP, LLC
Signature:
/s/ Adam Goulburn
Name/Title:
Adam Goulburn, Member
Date:
01/21/2026
Dimension Management GP, LLC
Signature:
/s/ Adam Goulburn
Name/Title:
Adam Goulburn, Member
Date:
01/21/2026
Dimension Capital I, L.P.
Signature:
/s/ Adam Goulburn
Name/Title:
By: Dimension Capital I GP, LP, its general partner; By: Adam Goulburn, Member
What stake in Monte Rosa Therapeutics (GLUE) is reported in this Schedule 13G/A?
The reporting group discloses beneficial ownership of 5,663,265 shares of Monte Rosa Therapeutics common stock, representing 8.7% of the outstanding shares.
Who are the reporting persons in the Monte Rosa Therapeutics (GLUE) Schedule 13G/A?
The reporting persons are Adam Goulburn, Zavain Dar, Nan Li, Dimension Management, L.P., Dimension Capital I GP, LLC, Dimension Management GP, LLC, and Dimension Capital I, L.P..
Is the 8.7% ownership in Monte Rosa Therapeutics (GLUE) an activist or passive position?
The group certifies that the securities were not acquired and are not held to change or influence control of Monte Rosa Therapeutics, indicating a passive investment.
How many Monte Rosa Therapeutics (GLUE) shares were outstanding for the 8.7% calculation?
The 8.7% ownership figure is based on 65,117,761 shares of Monte Rosa Therapeutics common stock outstanding as of October 31, 2025, as reported in the company’s Form 10-Q.
Which entity directly holds the Monte Rosa Therapeutics (GLUE) shares reported in this filing?
Dimension Capital I, L.P. directly holds 5,663,265 shares of Monte Rosa Therapeutics common stock, with other reporting persons listed as related investment adviser, general partners, and individual members.
What type of securities are covered in this Monte Rosa Therapeutics (GLUE) Schedule 13G/A?
The filing covers common stock of Monte Rosa Therapeutics, Inc., with a par value of $0.0001 per share and CUSIP 61225M102.
