[SCHEDULE 13G] James River Group Holdings, Ltd SEC Filing

Rhea-AI Filing Summary

Zimmer Partners and affiliated entities report beneficial ownership of 2,985,810 common shares of James River Group Holdings, Ltd., representing approximately 6.5% of the outstanding common stock based on 45,895,335 shares outstanding. The disclosed position is held with shared voting and shared dispositive power; no reporting person claims sole voting or sole dispositive power over these shares. The interest is held through Zimmer accounts managed by the Investment Manager and related entities.

The filing includes a certification that the securities were acquired and are held in the ordinary course of business and were not acquired to change or influence control of the issuer. Reporting Persons are identified as Zimmer Partners, LP; Zimmer Financial Services Group LLC; Zimmer Partners GP, LLC; and Stuart J. Zimmer.

Positive

• Material ownership disclosed: 2,985,810 shares representing approximately 6.5% of outstanding common stock
• Clear governance profile: Reporting Persons state shared voting and shared dispositive power, clarifying how control is exercised
• Certification provided: Securities were acquired and are held in the ordinary course and not to change or influence issuer control

Negative

• None.

Insights

Financial Analyst

TL;DR: Zimmer discloses a material 6.5% stake (2.99M shares) in JRVR with shared voting/dispositive power; position is significant but non-controlling.

The filing shows the Reporting Persons collectively beneficially own 2,985,810 shares, equal to about 6.5% of James River's common stock on the stated share base of 45,895,335. Ownership is exercised through multiple related entities, with shared voting and dispositive power and no sole power reported. The certification states the stake was acquired in the ordinary course and not to effect a change in control, so the disclosure signals a substantial passive or monitored investment rather than an overt control bid.

Corporate Governance Expert

TL;DR: Disclosure indicates coordination among Zimmer entities and the potential for collective influence, but no single entity holds unilateral control.

The Schedule 13G identifies the reporting group structure: an investment manager, its GP, a financial services LLC as sole member of the GP, and an individual (Stuart J. Zimmer). The filing reports shared voting and dispositive power across these entities and explicitly records 0 sole voting power, which is material for governance analysis because it limits unilateral action while preserving the ability to coordinate voting or engagement via the group. The filing also contains the statutory certification about ordinary-course holdings.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

James River Group Holdings, Ltd.

(Name of Issuer)

Common Shares, par value $0.0002 per share

(Title of Class of Securities)

G5005R107

(CUSIP Number)

06/30/2025

(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. G5005R107

1

Names of Reporting Persons

Zimmer Partners, LP

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 2,985,810.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,985,810.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,985,810.00

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)

6.5 %

12

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

CUSIP No. G5005R107

1

Names of Reporting Persons

Zimmer Financial Services Group 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 2,985,810.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,985,810.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,985,810.00

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)

6.5 %

12

Type of Reporting Person (See Instructions)

OO, HC

SCHEDULE 13G

CUSIP No. G5005R107

1

Names of Reporting Persons

Zimmer Partners 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 2,985,810.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,985,810.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,985,810.00

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)

6.5 %

12

Type of Reporting Person (See Instructions)

OO, HC

SCHEDULE 13G

CUSIP No. G5005R107

1

Names of Reporting Persons

Stuart J. Zimmer

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 2,985,810.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,985,810.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,985,810.00

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)

6.5 %

12

Type of Reporting Person (See Instructions)

IN, HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: James River Group Holdings, Ltd.
(b)	Address of issuer's principal executive offices: Clarendon House, 2 Church Street, Hamilton, Pembroke, Bermuda, HM11
Item 2.
(a)	Name of person filing: Zimmer Partners, LP, a Delaware limited partnership (the "Investment Manager"), Zimmer Financial Services Group LLC, a Delaware limited liability company ("ZFSG"), Zimmer Partners GP, LLC, a Delaware limited liability company (the "GP"), and Stuart J. Zimmer (collectively, the "Reporting Persons"). ZFSG is the sole member of the GP. ZFSG is the sole member of the GP. Stuart J. Zimmer, a revocable trust for his benefit, and an irrevocable trust for his immediate family are the sole members of ZFSG. The GP is the general partner of the Investment Manager. The Investment Manager is the investment manager of Zimmer Master Infrastructure Fund, LP and ZP Master MidCap Fund, Ltd., (together, the "Zimmer Accounts").
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is c/o Zimmer Partners, LP, 9 West 57th Street, 33rd Floor New York, NY 10019.
(c)	Citizenship: Delaware
(d)	Title of class of securities: Common Shares, par value $0.0002 per share
(e)	CUSIP No.: G5005R107
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 Reporting Persons may be deemed the beneficial owners of 2,985,810 shares of Common Stock. The Reporting Persons may be deemed the beneficial owners of approximately 6.5% of the outstanding shares of Common Stock. This percentage was determined by dividing 2,985,810 by 45,895,335, which is the number of shares of Common Stock outstanding as of June 30, 2025, as reported in the Issuer's Form 10-Q filed on August 5, 2025 with the Securities and Exchange Commission. The Reporting Persons have the shared power to vote and dispose of the 2,985,810 shares of Common Stock beneficially owned.
(b)	Percent of class: 6.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 2,985,810
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 2,985,810
Item 5.	Ownership of 5 Percent or Less of a Class.
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 acquired and are held in the ordinary course of business and 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.

Zimmer Partners, LP

Signature:	/s/ Jelena Napolitano
Name/Title:	Jelena Napolitano/ Authorized Person
Date:	08/14/2025

Zimmer Financial Services Group LLC

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer / Director
Date:	08/14/2025

Zimmer Partners GP, LLC

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer/ Director, Zimmer Financial Services Group LLC, its Managing Member
Date:	08/14/2025

Stuart J. Zimmer

Signature:	/s/ Stuart J. Zimmer
Name/Title:	Stuart J. Zimmer / Self
Date:	08/14/2025

FAQ

How many James River (JRVR) shares does Zimmer Partners report owning?

The Reporting Persons disclose beneficial ownership of 2,985,810 shares of James River common stock.

What percentage of JRVR does the disclosed Zimmer position represent?

The position represents approximately 6.5% of the outstanding common stock based on 45,895,335 shares outstanding.

Do the Zimmer Reporting Persons have sole voting control over these JRVR shares?

No. The filing reports 0 sole voting power and 2,985,810 shared voting power held by the Reporting Persons.

Through which entities is the JRVR position held?

The position is held through related entities: Zimmer Partners, LP; Zimmer Financial Services Group LLC; Zimmer Partners GP, LLC; and Stuart J. Zimmer.

Was the JRVR stake acquired to influence control of the company?

The filing includes a certification that the securities were acquired and are held in the ordinary course of business and were not acquired to change or influence control of the issuer.