X0306 4 2020-02-24 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001275977 LAVEY RICHARD W C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET WORCESTER MA 01653 0 1 0 0 Executive Vice President Common Stock 2020-02-24 4 A 0 4588 0 A 20269.6 D Common Stock 2020-02-24 4 F 0 1364 134.22 D 18905.6 D On February 24, 2017, the Reporting Person was granted 3,059 (target) performance-based restricted stock units ("PBRSUs") pursuant to the Issuer's 2014 Long-Term Incentive Plan. The PBRSUs were subject to both performance-based and time-based vesting conditions. On February 24, 2020, the performance condition for this award was certified at 150% of the target award and the time-based vesting condition was satisfied, vesting the award for the number of shares indicated. Represents shares that were forfeited to pay withholding taxes upon the vesting of the PBRSUs described in Footnote 1. /s/ Matthew R. Frascella pursuant to Confirming Statement 2020-02-26