X0306 4 2022-11-04 0 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001576903 Welzenbach Mark Joseph C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET (S-316) WORCESTER MA 01653 0 1 0 0 Executive Vice President Common Stock 2022-11-04 4 S 0 2673 142.21 D 19846.309 D The price reported in column 4 is a weighted average price. The shares were sold at prices ranging from $142.04 to $143.02. The Reporting Person undertakes to provide to 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 price within the range set forth above. Walter H. Stowell pursuant to Confirming Statement 2022-11-07