Table of Contents Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ______to ______ Commission File Number: 000-50070 SAFETY INSURANCE GROUP, INC. (Exact name of registrant as specified in its charter) Delaware 13-4181699 (State or other jurisdiction of incorporat ...