HANOVER INSURANCE GROUP INC

Rule 10b5-1 Trading Plans

On November 5, 2024, John C. Roche, the Company’s President and CEO, adopted a trading plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). His 10b5-1 trading plan provides for the exercise, and subsequent sale, of options to purchase an aggregate of 21,413 shares of the Company’s common stock that were issued to Mr. Roche on February 23, 2016 and set to expire on February 23, 2026. The 10b5-1 trading plan expires on February 20, 2026, or upon an earlier date if and when all the options are exercised and sold. The amount of shares actually sold will depend on the satisfaction of certain conditions as set forth in his 10b5-1 trading plan.

On November 27, 2024, Bryan J. Salvatore, the Company’s Executive Vice President and President, Specialty, adopted a trading plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). His 10b5-1 trading plan provides for the exercise, and subsequent sale, of options to purchase an aggregate of 21,052 shares of the Company’s common stock that were issued to Mr. Salvatore on June 12, 2017 and set to expire on June 12, 2027. The 10b5-1 trading plan expires on May 30, 2025, or upon an earlier date if and when all the options are exercised and sold. The amount of shares actually sold will depend on the satisfaction of certain conditions as set forth in his 10b5-1 trading plan.

No other officer or director adopted, modified, orterminated a contract, instruction or written plan for the purchase or sale of the Company’s securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a non-Rule 10b5-1 trading arrangement during the fourth quarter ended December 31, 2024.