X0508 4 2025-05-14 0000944695 HANOVER INSURANCE GROUP, INC. THG 0001584240 Egan Cynthia C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN STREET WORCESTER MA 01653 1 0 0 0 0 Common Stock 2025-05-14 4 A 0 977 0 A 977 I Deferral Agreement Shares granted pursuant to the Issuer's 2022 Long-Term Incentive Plan. Does not include 12,759 shares held directly by the Reporting Person. /s/ Lindsay L. Katz pursuant to Confirming Statement 2025-05-15