X0306 4 2020-02-24 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001269358 BARNES WARREN E. C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET WORCESTER MA 01653 0 1 0 0 SVP & Princpl. Accntg. Officer Common Stock 2020-02-24 4 M 0 675 85.87 A 5032.723 D Common Stock 2020-02-24 4 S 0 675 134.96 D 4357.723 D Common Stock 2020-02-24 4 F 0 262 134.22 D 4095.723 D Common Stock 2020-02-25 4 S 0 615 134.0854 D 3480.723 D Common Stock Option (right to buy) 85.87 2020-02-24 4 M 0 675 0 D 2027-02-24 Common Stock 675 0 D Represents shares that were forfeited to pay withholding taxes upon the vesting of restricted stock units that were previously granted by the Issuer. The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $133.71 to $134.54. The Reporting Person undertakes to provide The Hanover Insurance Group, Inc. ("THG"), any security holder of THG, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. The option, representing the right to purchase a total of 2,023 shares, vested 1/3 on each of 2/24/18, 2/24/19, and 2/24/20. /s/ Matthew R. Frascella pursuant to Confirming Statement 2020-02-26