Safety Insurance Group (NASDAQ: SAFT) insider affiliates sell 2,650 shares, retain 1.79M

Rhea-AI Filing Summary

SAFETY INSURANCE GROUP INC reported an insider transaction by SRB Corporation and The Plymouth Rock Company Incorporated, which are ten percent owners. On July 9, 2026, they executed an open-market sale of 2,650 shares of common stock at $76.511 per share, held indirectly through affiliated entities. After this sale, entities associated with the reporting persons collectively held 1,792,005 shares of common stock. The reporting persons note complex ownership across multiple subsidiaries and expressly disclaim beneficial ownership except to the extent of any pecuniary interest.

Insights

Equity ownership specialist

Small indirect sale; complex group ownership, large position remains.

Entities associated with SRB Corporation and The Plymouth Rock Company Incorporated reported an open-market sale of 2,650 SAFETY INSURANCE GROUP INC common shares at $76.511 per share on July 9, 2026. The shares are held indirectly through a network of insurance and holding company subsidiaries.

After the sale, these entities collectively held 1,792,005 common shares, indicating a continuing substantial ownership position. The reporting persons state that SRB acts as investment manager and may be deemed to have voting and dispositive power but expressly disclaim beneficial ownership beyond any pecuniary interest and do not concede group status under Section 13(d).

Insider Trade Summary

Net Seller: 2,650 shares ($202,754)

Net Sell 1 txn

Insider SRB CORP, Plymouth Rock Co Inc

Role null | null

Sold 2,650 shs ($203K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,650	$76.511	$203K

Holdings After Transaction: Common Stock — 1,792,005 shares (Indirect, See)

Footnotes (1)

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) 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. PRC holds 4,120 of the shares of Common Stock reported on this Form 4. The following subsidiaries of PRC hold in the aggregate 771,766 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) 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 1,016,119 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) 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: 2,650 shares Sale price per share: $76.511 Shares held after transaction: 1,792,005 shares +3 more

6 metrics

Shares sold 2,650 shares Open-market sale of common stock on July 9, 2026

Sale price per share $76.511 Price per share for the 2,650 shares of common stock sold

Shares held after transaction 1,792,005 shares Total common shares held indirectly by associated entities after the sale

Shares held directly by Plymouth Rock 4,120 shares Portion of the reported common stock position held directly by Plymouth Rock

Shares held by Plymouth Rock subsidiaries 771,766 shares Aggregate common stock position held by specified Plymouth Rock subsidiaries

Shares held by PSIA and its subsidiaries 1,016,119 shares Aggregate common stock position held by Palisades Safety and Insurance Association and its subsidiaries

Key Terms

beneficial ownership, pecuniary interest, Section 16, Section 13(d)(3), +1 more

5 terms

beneficial ownership financial

"SRB disclaims beneficial ownership of the shares of Common Stock reported"

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.

pecuniary interest financial

"PRC disclaims beneficial ownership ... except to the extent of its pecuniary interest"

Section 16 regulatory

"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.

Section 13(d)(3) regulatory

"may be deemed a "group" within the meaning of Section 13(d)(3)"

reciprocal insurance exchange technical

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/10/2026 - 06:36 PM Accepted by SEC EDGAR 07/10/2026 - 06:35 PM Learn about SEC filing dates

FAQ

What insider transaction did SRB Corp report in SAFETY INSURANCE GROUP INC (SAFT)?

SRB Corporation, together with The Plymouth Rock Company Incorporated, reported an open-market sale of 2,650 shares of SAFETY INSURANCE GROUP INC common stock at $76.511 per share on July 9, 2026, held indirectly through affiliated entities.

How many SAFT shares do the reporting entities hold after this Form 4 transaction?

Following the reported sale, entities associated with the reporting persons collectively held 1,792,005 shares of SAFETY INSURANCE GROUP INC common stock. This figure reflects indirect holdings across multiple subsidiaries and related insurance entities described in the ownership footnotes.

Who are the reporting persons in the SAFT Form 4 filed on this transaction?

The reporting persons are SRB Corporation and The Plymouth Rock Company Incorporated, each identified as a ten percent owner of SAFETY INSURANCE GROUP INC. SRB is a direct, wholly owned subsidiary of Plymouth Rock and acts as investment manager for Plymouth Rock.

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

No. SRB and Plymouth Rock each disclaim beneficial ownership of the reported SAFETY INSURANCE GROUP INC shares, except to the extent of any pecuniary interest, and state that the joint filing does not constitute an admission of group status or beneficial ownership.

How are the SAFT shares distributed among Plymouth Rock-related entities?

The filing notes that 4,120 shares are held directly by Plymouth Rock and 771,766 shares are held by various Plymouth Rock subsidiaries. An additional 1,016,119 shares are held by Palisades Safety and Insurance Association and its subsidiaries, all contributing to the 1,792,005-share total position.

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)
07/09/2026

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	07/09/2026		S		2,650	D	$76.511	1,792,005(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 771,766 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 1,016,119 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	07/10/2026
	** 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)