Transaction Details

Footnotes

Exercise and subsequent sale of options scheduled to expire in February 2026. | The price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $177.42 to $178.41. 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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $178.44 to $179.37. The Reporting Person undertakes to provide 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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $179.44 to $180.18. The Reporting Person undertakes to provide 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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $177.42 to $178.41. The Reporting Person undertakes to provide 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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $178.44 to $179.43. The Reporting Person undertakes to provide 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 price reported in Column 4 is a weighted average price. The shares were sold at multiple prices ranging from $179.63 to $179.79. The Reporting Person undertakes to provide 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. | Charitable gift of shares. | The option, representing the right to purchase a total of 17,420 shares, vested 1/3 on each of 2/23/2017, 2/23/2018 and 2/23/2019.