Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  SRB Corp
2. Date of Event Requiring Statement (Month/Day/Year)
02/06/2018
3. Issuer Name and Ticker or Trading Symbol
SAFETY INSURANCE GROUP INC [SAFT]
(Last)
(First)
(Middle)
125 HIGH STREET
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02110
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 1,537,233
I
See Footnotes (1) (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
SRB Corp
125 HIGH STREET
BOSTON, MA 02110
    X    
Plymouth Rock Co Inc
695 ATLANTIC AVENUE
BOSTON, MA 02111
    X    
Palisades Safety & Insurance Association
200 CONNELL DRIVE, SUITE 3000
BERKELEY HEIGHTS, NJ 07922
    X    

Signatures

/s/ Frederick C. Childs for SRB Corporation 02/13/2018
**Signature of Reporting Person Date

/s/ Colleen Granahan for The Plymouth Rock Company Incorporated 02/13/2018
**Signature of Reporting Person Date

/s/ Ed Fernandez for Palisades Safety and Insurance Association by Plymouth Rock Management Company of New Jersey, its Attorney-in-Fact 02/13/2018
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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).
(1) This Form 3 is being jointly filed by SRB Corporation, a Massachusetts corporation ("SRB"), The Plymouth Rock Company Incorporated, a Massachusetts corporation ("PRC"), and Palisades Safety and Insurance Association, a New Jersey reciprocal insurance exchange ("PSIA"), and each shall be deemed a Reporting Person. SRB is a direct, wholly-owned subsidiwy of PRC and acts as investment manager to each of PRC and PSIA, and, in such capacity, may be deemed to have voting and dispositive power over the shares of Common Stock reported on this Form 3. SRB disclaims beneficial ownership of the shares of Common Stock reported on this Form 3, 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. 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.
(2) PRC holds 539,296 of the shares of Common Stock reported on this Form 3. PRC includes the accounts of the following entities: Plymouth Rock Security Corporation, a Massachusetts security corporation ("PRSC"); Plymouth Rock Assurance Corporation, a Massachusetts corporation ("PRAC"); Pilgrim Insurance Company, a Massachusetts corporation; ("PIC"); Mt. Washington Assurance Corporation, a New Hampshire corporation; Bunker Hill Insurance Company, a Massachusetts corporation ("BHIC"); 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"); and Bunker Hill Security Insurance Company, a Massachusetts corporation ("BHSIC"). PRSC, PRAC, and BHIC are direct wholly-owned subsidiaries of PRC. PIC is a direct wholly-owned subsidiary of SRB.
(3) PSIA holds 997,937 of the shares of Common Stock reported on this Form 3. PSIA includes the accounts of High Point Safety and lnsurance Company, a New Jersey corporation ("HPSIC"); High Point Property and Casualty Insurance Company, a New Jersey corporation ("HPPCIC"); and High Point Preferred Insurance Company, a New Jersey corporation ("HPPIC"); Palisades Insurance Company, a New Jersey corporation ("PICNJ"); 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.
 
Remarks:
Footnote #1 continued:  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.

Footnote #2 continued:  BHICC, BHPREFIC, BHPIC, and BHSIC are direct wholly-owned subsidiaries of BHIC.  PRC disclaims beneficial ownership of the shares of Common Stock reported on this Form 3 except to the extent of its pecuniary interst 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.

Footnote #3 continued:  PSIA disclaims beneficial ownership of the shares of Common Stock reported on this Form 3 except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that PSIA is a beneficial owner of such shares for purposes of Section 16 or for any other purposes.

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