X0306 4/A 2022-03-07 2022-03-09 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001843620 Lee Willard T C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET WORCESTER MA 01653 0 1 0 0 Executive Vice President Common Stock 2022-03-07 4 F 0 332 139.520 D 2986.0510 D Represents shares that were forfeited to pay withholding taxes upon the vesting of restricted stock units that were previously granted by the Issuer and vested on March 7, 2022. In connection with vesting, any fractional shares were rounded up to the next whole share in accordance with the terms of the award agreement. On March 9, 2022, the Reporting Person filed a Form 4 that mistakenly overstated the number of securities beneficially owned following the reported transaction in Item 5 of Table I by 180 shares. This Form 4 Amendment is solely being filed to update Item 5 in Table I to correct the amount previously reported in error. As a result of this error, the Reporting Person's intervening report filed on March 29, 2022 also overstated the number of securities beneficially owned in Item 5 of Table I by 180 shares. /s/ Matthew R. Frascella pursuant to Confirming Statement 2022-04-29