Plymouth Rock, SRB Corp File Form 4 for Safety Insurance Group

TL;DR

**Major shareholders just filed paperwork, get ready for potential insider trading news.**

AI Summary

This Form 4 filing, dated March 23, 2026, indicates that Plymouth Rock Co Inc and SRB CORP are reporting entities related to SAFETY INSURANCE GROUP INC. While the filing itself doesn't detail specific transactions, it establishes their reporting obligations for changes in beneficial ownership of SAFETY INSURANCE GROUP INC securities. This matters to investors because these entities are significant shareholders, and future filings will reveal their buying or selling activity, which can signal their confidence in the company's prospects.

Why It Matters

This filing sets the stage for future disclosures of insider trading by major shareholders, which can influence investor sentiment and stock price.

Risk Assessment

Risk Level: low — This filing is purely administrative and does not report any actual transactions, thus posing minimal immediate risk.

Analyst Insight

Investors should add SAFETY INSURANCE GROUP INC to their watchlists and monitor future Form 4 filings from Plymouth Rock Co Inc and SRB CORP for actual transaction data, as significant buys or sells could indicate insider sentiment.

Key Players & Entities

• Plymouth Rock Co Inc (company) — reporting entity
• SRB CORP (company) — reporting entity
• SAFETY INSURANCE GROUP INC (company) — issuer of securities
• 0001556246 (person) — CIK for Plymouth Rock Co Inc
• 0001496228 (person) — CIK for SRB CORP
• 0001172052 (person) — CIK for SAFETY INSURANCE GROUP INC

FAQ

Filing Documents

• ownership.html (4)
• ownership.xml (4) — 9KB
• 0000904454-26-000197.txt ( ) — 11KB

From the Filing

SEC FORM 4 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940 OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5    Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).    Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10. 1. Name and Address of Reporting Person * SRB CORP (Last) (First) (Middle) 695 ATLANTIC AVENUE (Street) BOSTON MASSACHUSETTS 02111 (City) (State) (Zip) UNITED STATES (Country) 2. Issuer Name and Ticker or Trading Symbol SAFETY INSURANCE GROUP INC [ SAFT ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below) 2a. Foreign Trading Symbol 3. Date of Earliest Transaction (Month/Day/Year) 03/20/2026 6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person 4. If Amendment, Date of Original Filed (Month/Day/Year) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/20/2026 S 14,151 D $ 71.122 1,794,655 (1) (2) (3) (4) (5) I See (1) (2) (3) (4) (5) Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares 1. Name and Address of Reporting Person * SRB CORP (Last) (First) (Middle) 695 ATLANTIC AVENUE (Street) BOSTON MASSACHUSETTS 02111 (City) (State) (Zip) UNITED STATES (Country) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below) 1. Name and Address of Reporting Person * Plymouth Rock Co Inc (Last) (First) (Middle) 695 ATLANTIC AVENUE (Street) BOSTON MASSACHUSETTS 02111 (City) (State) (Zip) UNITED STATES (Country) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below) Explanation of Responses: 1. This Form 4 is being jointly filed by SRB Corporation, a Massachusetts corporation ("SRB"), and The Plymouth Rock Company Incorporated, a Massachusetts corporation ("PRC"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiary of PRC and acts as investment manager to PRC and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 4. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4, and this report shall not be deemed an admission that SRB is a beneficial owner of such shares for purposes of Section 16 or for any other purpose. (Continued in Footnote 2) 2. The Reporting Persons are making this single joint filing because they may be deemed a "group" within the meaning of Section 13(d)(3) of the Securities Act of 1934, as amended. This joint filing shall not, however, be deemed an affirmation that a group exists among the Reporting Persons for the purposes of the Securities Exchange Act of 1934 or for any other purpose and each Reporting Person expressly disclaims beneficial ownership of any securities beneficially owned by any other person. 3. PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 772,856 shares

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View this 4 filing on SEC EDGAR