UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

August 21, 2013

Date of Report (Date of earliest event reported)

SAFETY INSURANCE GROUP, INC.

(Exact name of registrant as specified in its charter)

20 Custom House Street, Boston, Massachusetts 02110

(Address of principal executive offices including zip code)

(617) 951-0600

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

ITEM 1.01 ENTRY INTO A MATERIAL DEFINITIVE AGREEMENT

On August 21, 2013, Safety Insurance Group, Inc. (the “Registrant”) entered into Amendment No. 2 to Amended and Restated Revolving Credit Agreement (“Amendment 2”) with RBS Citizens, N.A., as administrative agent for itself and other lending institutions.  Amendment 2 extends the maturity date to August 14, 2018 and provides that all material terms and conditions of the Amended and Restated Credit Agreement remain and continue in full force and effect. The Registrant has no amount outstanding under this credit facility currently.

ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS.

(d) Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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