X0202 SCHEDULE 13G/A 0000904454-24-000169 0001496228 XXXXXXXX LIVE 15 Common Stock, par value $0.01 per share 03/31/2026 0001172052 Safety Insurance Group, Inc. 78648T100 20 Custom House Street Boston MA 02110 Rule 13d-1(c) SRB Corporation MA 0.00 1794655.00 0.00 1794655.00 1794655.00 N 12.27 CO *Based on 14,631,684 shares of Common Stock outstanding as of February 13, 2026, as reported in the Issuer's Report on Form 10-K for the period ended December 31, 2025, filed with the Securities and Exchange Commission on February 27, 2026. The Plymouth Rock Company Incorporated MA 0.00 776976.00 0.00 776976.00 776976.00 N 5.31 CO *Based on 14,631,684 shares of Common Stock outstanding as of February 13, 2026, as reported in the Issuer's Report on Form 10-K for the period ended December 31, 2025, filed with the Securities and Exchange Commission on February 27, 2026. Palisades Safety and Insurance Association NJ 0.00 1017679.00 0.00 1017679.00 1017679.00 N 6.96 OO *Based on 14,631,684 shares of Common Stock outstanding as of February 13, 2026, as reported in the Issuer's Report on Form 10-K for the period ended December 31, 2025, filed with the Securities and Exchange Commission on February 27, 2026. Safety Insurance Group, Inc. 20 Custom House Street, Boston, MA 02110 This statement relates to shares of Common Stock of the Issuer held by the following: (1) SRB Corporation, a Massachusetts corporation ("SRB"), which is a direct wholly owned subsidiary of The Plymouth Rock Company Incorporated, a Massachusetts corporation ("PRC"). SRB serves as investment manager to each of PRSC, PRAC, PIC, PRHAC, PSIA, HPSIC, HPPCIC and HPPIC (as defined below) and, in such capacity, may be deemed to have voting and dispositive power over the shares held for the accounts of these entities. (2) PRC, for the accounts of the following entities: (i) Plymouth Rock Security Corporation, a Massachusetts corporation ("PRSC"); (ii) Plymouth Rock Assurance Corporation, a Massachusetts corporation ("PRAC"); (iii) Pilgrim Insurance Company, a Massachusetts corporation ("PIC"); and (iv) Plymouth Rock Home Assurance Corporation, a Massachusetts corporation ("PRHAC"). PRSC, PRAC and PRHAC are direct wholly-owned subsidiaries of PRC. PIC is a direct wholly-owned subsidiary of SRB. (3) Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange ("PSIA"), for its own account and for the accounts of the following entities owned by it: (i)High Point Safety and Insurance Company, a New Jersey corporation ("HPSIC"); (ii)High Point Property and Casualty Insurance Company, a New Jersey corporation ("HPPCIC"); and (iii) High Point Preferred Insurance Company, a New Jersey corporation ("HPPIC"). HPSIC and HPPIC are direct wholly owned subsidiaries of HPPCIC, which is a direct wholly owned subsidiary of PSIA. Plymouth Rock Management Company of New Jersey, a New Jersey corporation ("PRNJ"), is the attorney-in-fact for PSIA. PRNJ is an indirect wholly owned subsidiary of SRB. SRB, PRC, and PSIA are referred to herein collectively as the "Reporting Persons." The Reporting Persons are making this single, joint filing because they may be deemed to be a "group" within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Act"); this filing shall not, however, be deemed an affirmation that such a group exists for the purposes of the Act or for any other purpose, and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person. The agreement among the Reporting Persons to file jointly is attached hereto as Exhibit A. SRB: 695 Atlantic Avenue, 10th Floor, Boston, MA 02111 PRC: 695 Atlantic Avenue, 6th Floor, Boston, MA 02111 PSIA: 581 Main Street, 4th Floor, Woodbridge, NJ 07095 SRB: Massachusetts PRC: Massachusetts PSIA: New Jersey Y The information set forth in Rows 5 through 11 of the cover pages to this Schedule 13G is incorporated herein by reference for each Reporting Person. Y N Not Applicable See item 2(a) Y 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. Exhibit A - Joint Filing Agreement SRB Corporation /s/ Frederick C. Childs 04/13/2026 The Plymouth Rock Company Incorporated /s/ Andrew A. McElwee, Jr. 04/13/2026 Palisades Safety and Insurance Association By: Plymouth Rock Management Company of New Jersey, its Attorney-in-Fact 04/13/2026 /s/ Stephen G. Kalinsky 04/13/2026