The Hanover Insurance (THG) - 2025 Q4 - Annual Report

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from: to . Commission file number: 1-13754 THE HANOVER INSURANCE GROUP, INC. | Title of each class | Trading Symbol | Name of each exchange on which registered | ...