0001172052 2022-01-12 2022-01-12 0001172052 false 8-K 2022-01-12 SAFETY INSURANCE GROUP, INC. DE 000-50070 13-4181699 20 Custom House Street Boston MA 02110 (617) 951-0600 false true false false Common Stock, par value $0.01 per share SAFT NASDAQ false