Form 8-K SAFETY INSURANCE GROUP For: Jun 09

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

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

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June 9, 2026

Date of Report (Date of earliest event reported)

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SAFETY INSURANCE GROUP, INC.

(Exact name of registrant as specified in its charter)

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20 Custom House Street, Boston, Massachusetts 02110

(Address of principal executive offices including zip code)

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(617) 951-0600

(Registrant's telephone number, including area code)

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Not Applicable

(Former name or former address, if changed since last report)

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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:

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

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

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

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

Securities registered pursuant to Section 12(b) of the Act:

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company ☐

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 1.01 Entry into a Material Definitive Agreement

On June 9, 2026, Safety Insurance Group, Inc. (the “Company”) entered into Amendment No. 7 (the “Amendment”) to its Amended and Restated Revolving Credit Agreement (the “Credit Agreement”) with Citizens Bank, N.A., as administrative agent, and the lenders party thereto.

The Amendment, among other things, increases the aggregate committed amount of the revolving credit facility from $50 million to $100 million and extends the maturity date of the facility to June 9, 2031. As of the date of this Current Report on Form 8-K, the Company has not drawn any of the additional amounts available under the Credit Agreement in connection with the Amendment.

Except as described above, the Amendment does not materially modify the other terms of the Credit Agreement. The obligations under the Credit Agreement continue to be secured by certain accounts receivable and related assets of the Company, as more fully described in the Credit Agreement.

The foregoing description of the Amendment is a summary and is qualified in its entirety by reference to the full text of the Amendment, which is filed as Exhibit 10.1 to this Current Report on Form 8‑K and is incorporated herein by reference.

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Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

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The information set forth under Item 1.01 is incorporated herein by reference.

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Item 9.01 Financial Statements and Exhibits

(d) Exhibits

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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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