# EDGAR Filing Document

**Accession Number:** 0001172052
**File Stem:** 0000904454-26-000237
**Filing Date:** 2026-4
**Character Count:** 15477
**Document Hash:** d5849cb8b22baee74cccdeb3a7571a8f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000904454-26-000237.hdr.sgml**: 20260413

**ACCESSION NUMBER**: 0000904454-26-000237

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260413

**DATE AS OF CHANGE**: 20260413

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SAFETY INSURANCE GROUP INC
- **CENTRAL INDEX KEY:** 0001172052
- **STANDARD INDUSTRIAL CLASSIFICATION:** FIRE, MARINE & CASUALTY INSURANCE [6331]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 134181699
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-78620
- **FILM NUMBER:** 26858982

**BUSINESS ADDRESS:**
- **STREET 1:** 20 CUSTOM HOUSE STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02110
- **BUSINESS PHONE:** 617-951-0600

**MAIL ADDRESS:**
- **STREET 1:** 20 CUSTOM HOUSE STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02110

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SAFETY HOLDINGS INC
- **DATE OF NAME CHANGE:** 20020424
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SRB CORP
- **CENTRAL INDEX KEY:** 0001496228

**ORGANIZATION NAME:**
- **EIN:** 042968130
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A

**BUSINESS ADDRESS:**
- **STREET 1:** 695 ATLANTIC AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111
- **BUSINESS PHONE:** 617-457-7527

**MAIL ADDRESS:**
- **STREET 1:** 695 ATLANTIC AVENUE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SRB Corp
- **DATE OF NAME CHANGE:** 20100709

## Ex-1

**EXHIBIT A**

**JOINT FILING AGREEMENT**

The undersigned hereby agree that the statement on Schedule 13G to which this Agreement is annexed as Exhibit A, and any amendments thereto, is and will be filed on behalf of each of them in accordance with the provisions of Rule 13d-1<u>(</u>k) under the Securities Exchange Act of 1934, as amended.

Date: April 13, 2026

---

| | |
|:---|:---|
| &nbsp;&nbsp; SRB CORPORATION | &nbsp;&nbsp; SRB CORPORATION |
| &nbsp;&nbsp;By: | &nbsp;&nbsp;/s/ Frederick C. Childs |
|  | &nbsp;&nbsp; Name: Frederick C. Childs<br> Title: Vice President<br>|
| &nbsp;&nbsp; THE PLYMOUTH ROCK COMPANY INCORPORATED | &nbsp;&nbsp; THE PLYMOUTH ROCK COMPANY INCORPORATED |
| &nbsp;&nbsp;By: | &nbsp;&nbsp;/s/ Andrew A. McElwee, Jr. |
|  | &nbsp;&nbsp; Name: Andrew A. McElwee, Jr.<br> Title: President<br>|
| &nbsp;&nbsp; PALISADES SAFETY AND INSURANCE ASSOCIATION<br>By: Plymouth Rock Management Company of New Jersey, its Attorney-in-Fact | &nbsp;&nbsp; PALISADES SAFETY AND INSURANCE ASSOCIATION<br>By: Plymouth Rock Management Company of New Jersey, its Attorney-in-Fact |
| &nbsp;&nbsp;By: | &nbsp;&nbsp;/s/ Stephen G. Kalinsky |
|  | &nbsp;&nbsp; Name: Stephen G. Kalinsky<br> Title: President<br>|

---

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 15)**

**Issuer:** Safety Insurance Group, Inc.

**Title of Class of Securities:** Common Stock, par value $0.01 per share

**CUSIP Number:** —

**Date of Event Which Requires Filing of this Statement:** 03/31/2026

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [ ] Rule 13d-1(b)

- [x] Rule 13d-1(c)

- [ ] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>SRB Corporation | Names of Reporting Persons<br>SRB Corporation |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>MA | Citizenship or Place of Organization<br>MA |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>1794655.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>1794655.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1794655.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1794655.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>12.27% | Percent of Class Represented by Amount in Row (9)<br>12.27% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

**Comment for Type of Reporting Person:** *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.

---

| 1. | Names of Reporting Persons<br>The Plymouth Rock Company Incorporated | Names of Reporting Persons<br>The Plymouth Rock Company Incorporated |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>MA | Citizenship or Place of Organization<br>MA |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>776976.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>776976.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>776976.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>776976.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>5.31% | Percent of Class Represented by Amount in Row (9)<br>5.31% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

**Comment for Type of Reporting Person:** *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.

---

| 1. | Names of Reporting Persons<br>Palisades Safety and Insurance Association | Names of Reporting Persons<br>Palisades Safety and Insurance Association |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>NJ | Citizenship or Place of Organization<br>NJ |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>1017679.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>1017679.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1017679.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1017679.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>6.96% | Percent of Class Represented by Amount in Row (9)<br>6.96% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

**Comment for Type of Reporting Person:** *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.

---

**Item 1(a). Name of Issuer:**
Safety Insurance Group, Inc.

**Item 1(b). Address of Issuer's Principal Executive Offices:**
20 Custom House Street, Boston, MA 02110

**Item 2(a). Name of Person Filing:**
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.

**Item 2(b). Address of Principal Business Office:**
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

**Item 2(c). Citizenship:**
SRB: Massachusetts
PRC: Massachusetts
PSIA: New Jersey

**Item 2(d). Title of Class of Securities:**
Common Stock, par value $0.01 per share

**Item 2(e). CUSIP Number:**
—

**Item 3. If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:**

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), if filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

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.

**(b) Percent of class:**

—

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable
See item 2(a)

**Item 7. Identification and Classification of the Subsidiary**

Not Applicable

**Item 8. Identification and Classification of Members of the Group**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

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.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**SRB Corporation**

**Date:** 04/13/2026

**By:** /s/ Frederick C. Childs

**Name & Title:** Frederick C. Childs, Vice President

**The Plymouth Rock Company Incorporated**

**Date:** 04/13/2026

**By:** /s/ Andrew A. McElwee, Jr.

**Name & Title:** Andrew A. McElwee, Jr., President

**Palisades Safety and Insurance Association**

**Date:** 04/13/2026

**By:** By: Plymouth Rock Management Company of New Jersey, its Attorney-in-Fact

**Name & Title:** Stephen G. Kalinsky, President