X0306 4 2022-12-30 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001576903 Welzenbach Mark Joseph C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET WORCESTER MA 01653 0 1 0 0 Executive Vice President Common Stock 2022-12-30 4 A 0 18.938 0 A 19865.247 D Common Stock 2022-12-31 4 F 0 37 135.13 D 19828.247 D Grant of restricted stock units under the Issuer's 2022 Long-Term Incentive Plan upon the accrual of dividend rights associated with restricted stock units previously granted by the Issuer. Such units vest on the third anniversary of the date of grant of the underlying restricted stock units. Reflects shares withheld from restricted stock unit awards to cover FICA and related income tax obligations for executives eligible for retirement vesting under the terms of such awards. /s/ Walter H. Stowell pursuant to Confirming Statement 2023-01-04