Safety Insurance Group Inc (SAFT) holders sell 5,159 shares

Rhea-AI Filing Summary

SRB Corporation and The Plymouth Rock Company Incorporated, as 10% owners of Safety Insurance Group Inc, reported selling 5,159 shares of common stock on 2026-07-17 at a price of $76.0315 per share. After this sale, affiliated entities report 1,752,574 shares held indirectly.

The indirect holdings are spread across Plymouth Rock, its direct and indirect insurance subsidiaries, and Palisades Safety and Insurance Association and its subsidiaries. SRB disclaims beneficial ownership of the reported shares, and Plymouth Rock disclaims beneficial ownership except to the extent of its pecuniary interest.

Insider Trade Summary

Net Seller: 5,159 shares

Net Sell 1 txn

Insider SRB CORP, Plymouth Rock Co Inc

Role 10% Owner | 10% Owner

Sold 5,159 shs ($392K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3, F4, F5	5,159	$76.0315	$392K

Holdings After Transaction: Common Stock — 1,752,574 shares (Indirect, See)

Footnotes (5)

1. F1. 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. F2. 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. F3. PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation ("PRSC"); Plymouth Rock Assurance Corporation, a Massachusetts corporation ("PRAC"); Plymouth Rock Assurance Preferred Corporation, a New York corporation ("PRAPC"); Plymouth Rock Assurance Corporation of New York, a New York corporation ("PRACNY"); Pilgrim Insurance Company, a Massachusetts corporation ("Pilgrim"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation ("PRHAC"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation ("BHICC"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation ("BHPREFIC"); Bunker Hill Property Insurance Company, a Massachusetts corporation ("BHPIC"); (Continued in Footnote 4)
4. F4. and Bunker Hill Insurance Company, a Massachusetts corporation ("BHIC"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange ("PSIA"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 992,895 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation ("HPSIC"); High Point Property and Casualty Insurance Company, a New Jersey corporation ("HPPCIC"); High Point Preferred Insurance Company, a New Jersey corporation ("HPPIC"); Palisades Insurance Company, a New Jersey corporation ("PICNJ"); (Continued in Footnote 5)
5. F5. Twin Lights Insurance Company, a New Jersey corporation ("TLIC"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation ("TAIC"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.

Key Figures

Shares sold: 5,159 shares Sale price per share: 76.0315 per share Indirect holdings after transaction: 1,752,574 shares +3 more

6 metrics

Shares sold 5,159 shares Common Stock sale on 2026-07-17 by SRB Corp/Plymouth Rock reporting group

Sale price per share 76.0315 per share Price for the 5,159 Safety Insurance Group common shares sold

Indirect holdings after transaction 1,752,574 shares Total indirect Safety Insurance Group shares reported following the sale

PRC direct holding 4,120 shares Shares of Safety Insurance Group held directly by The Plymouth Rock Company Incorporated

PRC subsidiaries aggregate holding 755,559 shares Aggregate Safety Insurance Group shares held by specified PRC subsidiaries

PSIA group aggregate holding 992,895 shares Aggregate Safety Insurance Group shares held by PSIA and its named subsidiaries

Key Terms

Section 16, beneficial ownership, dispositive power, pecuniary interest, +1 more

5 terms

Section 16 regulatory

"beneficial owner of such shares for purposes of Section 16 or for any other purpose"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

beneficial ownership regulatory

"SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 4"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

dispositive power financial

"may be deemed to have voting and dispositive power over the shares of Common Stock"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

pecuniary interest financial

"PRC disclaims beneficial ownership of the shares of Common Stock except to the extent of its pecuniary interest"

reciprocal insurance exchange technical

"Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange ("PSIA")"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/20/2026 - 07:06 PM Accepted by SEC EDGAR 07/20/2026 - 07:05 PM Learn about SEC filing dates

FAQ

What insider transaction did SRB Corp report for Safety Insurance Group (SAFT)?

SRB Corp, with Plymouth Rock, reported selling 5,159 Safety Insurance Group common shares on 2026-07-17 at $76.0315. Following the transaction, their affiliated entities collectively report holding 1,752,574 shares indirectly, as disclosed for Section 16 reporting purposes under the Form 4 filing.

How many Safety Insurance Group (SAFT) shares were sold and at what price?

The reporting group sold 5,159 shares of Safety Insurance Group common stock at $76.0315 per share. The transaction is reported as an indirect sale of common stock by entities associated with SRB Corporation and The Plymouth Rock Company Incorporated.

What is the indirect ownership in SAFT after this Form 4 transaction?

After the reported sale, affiliated entities of SRB Corp and Plymouth Rock report holding 1,752,574 shares of Safety Insurance Group indirectly. This figure reflects aggregate holdings across multiple related insurance entities as of the 2026-07-17 transaction date.

Which entities hold the reported Safety Insurance Group (SAFT) shares?

The reported shares are held by The Plymouth Rock Company Incorporated, its subsidiaries holding an aggregate 755,559 shares, PRC’s direct holding of 4,120 shares, and Palisades Safety and Insurance Association and its subsidiaries holding 992,895 shares, all reported as indirect holdings.

Do SRB Corp and Plymouth Rock claim full beneficial ownership of the SAFT shares?

SRB Corp disclaims beneficial ownership of the Safety Insurance Group shares reported. Plymouth Rock likewise disclaims beneficial ownership of the reported shares, except to the extent of its pecuniary interest, as explicitly stated in the Form 4 footnotes.

Why is this a joint Form 4 filing for SAFT by SRB Corp and Plymouth Rock?

SRB Corp and Plymouth Rock made a joint filing because they may be deemed a group under Section 13(d)(3). However, they expressly state that this joint filing does not affirm that a group exists and each disclaims beneficial ownership of securities held by the other.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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)
07/17/2026

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	07/17/2026		S		5,159	D	$76.0315	1,752,574(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 755,559 shares of the Common Stock reported on this Form 4: Plymouth Rock Security Corporation, a Massachusetts security corporation ("PRSC"); Plymouth Rock Assurance Corporation, a Massachusetts corporation ("PRAC"); Plymouth Rock Assurance Preferred Corporation, a New York corporation ("PRAPC"); Plymouth Rock Assurance Corporation of New York, a New York corporation ("PRACNY"); Pilgrim Insurance Company, a Massachusetts corporation ("Pilgrim"); Plymouth Rock Home Assurance Corporation, a Massachusetts corporation ("PRHAC"); Bunker Hill Insurance Casualty Company, a Massachusetts corporation ("BHICC"); Bunker Hill Preferred Insurance Company, a Massachusetts corporation ("BHPREFIC"); Bunker Hill Property Insurance Company, a Massachusetts corporation ("BHPIC"); (Continued in Footnote 4)

4. and Bunker Hill Insurance Company, a Massachusetts corporation ("BHIC"). PRSC, PRAC, and PRHAC are direct wholly-owned subsidiaries of PRC. PRAPC and PRACNY are direct wholly-owned subsidiaries of PRAC. Pilgrim is a direct wholly-owned subsidiary of SRB. BHICC, BHPREFIC, BHPIC, and BHIC are direct wholly-owned subsidiaries of PRHAC. Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange ("PSIA"), is managed by a subsidiary of PRC. PSIA and the following subsidiaries of PSIA hold in the aggregate 992,895 shares of the Common Stock reported on this Form 4: High Point Safety and Insurance Company, a New Jersey corporation ("HPSIC"); High Point Property and Casualty Insurance Company, a New Jersey corporation ("HPPCIC"); High Point Preferred Insurance Company, a New Jersey corporation ("HPPIC"); Palisades Insurance Company, a New Jersey corporation ("PICNJ"); (Continued in Footnote 5)

5. Twin Lights Insurance Company, a New Jersey corporation ("TLIC"); and Teachers Auto Insurance Company of New Jersey, a New Jersey corporation ("TAIC"). HPSIC, HPPIC, TLIC, and TAIC are direct wholly-owned subsidiaries of HPPCIC, which is a direct wholly-owned subsidiary of PSIA, as is PICNJ. PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 4 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PRC is a beneficial owner of such shares for purposes of Section 16 or for any other purpose.

	/s/ Frederick C. Childs	07/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)