X0202 SCHEDULE 13G/A 0001363829-25-000163 0001363829 XXXXXXXX LIVE 2 Common Shares, par value $0.0002 06/30/2026 0001620459 James River Group Holdings, Ltd. GR5005R107 Clarendon House 2 Church Street Hamilton, Pembroke D0 HM 11 Rule 13d-1(c) Enstar Group Limited D0 0.00 2590765.00 0.00 2590765.00 2590765.00 N 5.6 CO HC The percentage set forth in row (11) is calculated based upon 46,236,856 shares of the Issuer's Common Stock issued and outstanding as of May 4, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on May 5, 2026. Elk Insurance Holdings, LLC DE 0.00 2590765.00 0.00 2590765.00 2590765.00 N 5.6 CO HC The percentage set forth in row (11) is calculated based upon 46,236,856 shares of the Issuer's Common Stock issued and outstanding as of May 4, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on May 5, 2026. Jennifer Gordon X1 0.00 2590765.00 0.00 2590765.00 2590765.00 N 5.6 IN The percentage set forth in row (11) is calculated based upon 46,236,856 shares of the Issuer's Common Stock issued and outstanding as of May 4, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on May 5, 2026. Anthony Michael Muscolino X1 0.00 2590765.00 0.00 2590765.00 2590765.00 N 5.6 IN The percentage set forth in row (11) is calculated based upon 46,236,856 shares of the Issuer's Common Stock issued and outstanding as of May 4, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on May 5, 2026. James River Group Holdings, Ltd. Clarendon House, 2 Church Street, Hamilton, Pembroke, Bermuda, HM 11 This Schedule 13G is being jointly filed by Enstar Group Limited ("Enstar"), Elk Insurance Holdings, LLC ("Elk Insurance Holdings"), Jennifer Gordon and Anthony Michael Muscolino. The principal business address of Enstar is as follows: A.S. Cooper Building, 4th Floor 26 Reid Street Hamilton, Bermuda HM 11 The principal business address of Elk Insurance Holdings is as follows: 2100 McKinney Avenue, Suite 1500 Dallas, TX 75201 The business address of Jennifer Gordon and Anthony Michael Muscolino is as follows: 2100 McKinney Avenue, Suite 1500 Dallas, TX 75201 Enstar is organized under the laws of Bermuda. Elk Insurance Holdings is organized under the laws of the State of Delaware. Ms. Gordon and Mr. Muscolino are citizens of the United States. Y As of June 30, 2026, Cavello Bay Reinsurance Limited ("Cavello Bay") beneficially owns 2,590,765 shares of Common Stock of the Issuer. Cavello Bay is a wholly-owned subsidiary of Enstar, which is indirectly controlled by Elk Insurance Holdings. The sole shareholder of Enstar is Elk Bidco Limited. The sole owner of the ordinary shares of Elk Bidco Limited is Elk Parent Limited, which is wholly owned by Elk Intermediate Holdings, LLC, which is in turn wholly owned by Elk Topco, LLC. Elk Insurance Holdings owns 100% of the voting non-economic interests in Elk Topco, LLC, and the sole members of Elk Insurance Holdings are Jennifer Gordon and Anthony Michael Muscolino. As a result, Ms. Gordon and Mr. Muscolino and certain intermediate holding companies set forth below under Item 7 may be deemed to beneficially own all of these shares. Neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission that any Reporting Person is the beneficial owner of the Common Stock referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose. Each Reporting Person disclaims beneficial ownership of the securities held directly by Cavello Bay. 5.6% (based upon 46,236,856 shares of the Issuer's Common Stock issued and outstanding as of May 4, 2026, as disclosed in the Quarterly Report on Form 10-Q filed by the Issuer on May 5, 2026). See Item 5 of each cover page, which is hereby incorporated by reference. See Item 6 of each cover page, which is hereby incorporated by reference. See Item 7 of each cover page, which is hereby incorporated by reference. See Item 8 of each cover page, which is hereby incorporated by reference. Y N Y N Subsidiary: Elk Topco, LLC Elk Intermediate Holdings, LLC Elk Parent Limited Elk Bidco Limited Enstar Group Limited Kenmare Holdings Ltd. Cavello Bay Reinsurance Limited Y Y N 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. Joint Filing Agreement Enstar Group Limited /s/ Audrey Taranto Audrey Taranto/General Counsel 08/13/2026 Elk Insurance Holdings, LLC /s/ A. Michael Muscolino A. Michael Muscolino/Managing Member 08/13/2026 Jennifer Gordon /s/ Jennifer Gordon Jennifer Gordon 08/13/2026 Anthony Michael Muscolino /s/ A. Michael Muscolino Anthony Michael Muscolino 08/13/2026