X0303 4 2011-03-09 0 0001172052 SAFETY INSURANCE GROUP INC SAFT 0001214340 KRUPA DAVID E 20 CUSTOM HOUSE STREET BOSTON MA 02110 0 1 0 0 VP - Claims Operations Common Stock 2011-03-09 4 F 0 582 45.971 D 90145 D Common Stock 2011-03-09 4 F 0 585 46.335 D 89560 D Common Stock 2011-03-09 4 A 0 4224 0 A 93784 D Represents securities delivered in payment of a tax liability with respect to vesting of securities issued in accordance with Rule 16b-3. Represents the weighted average sale price of multiple open market same day sales with prices ranging from $45.54 to $46.17 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission, the issuer, or a security holder of the issuer upon request. Represents the weighted average sale price of multiple open market same day sales with prices ranging from $46.18 to $46.70 per share. Full information regarding the number of shares sold at each separate price will be provided to the Securities and Exchange Commission, the issuer, or a security holder of the issuer upon request. Represents restricted stock awards effective March 9, 2011, with respect to which sale or transfer rights shall vest over three years with installments of 30% on March 9, 2012, 30% on March 9, 2013, and the remaining 40% on March 9, 2014, provided the grantee is still an employee of Safety Insurance Group, Inc. on such dates. /s/David E. Krupa 2011-03-11