THG 2018 Annual Report

THE HANOVER INSURANCE GROUP, INC. ANNUAL REPORT ON FORM 10-K FOR THE FISCAL YEAR ENDED DECEMBER 31, 2018 TABLE OF CONTENTS Item Description Page Part I 1 Business..................................................................................................................................................................... 3 1A. Risk Factors ............................................................................................................................................................... 17 1B. Unresolved Staff Comments...................................................................................................................................... 33 2 Properties................................................................................................................................................................... 33 3 Legal Proceedings...................................................................................................................................................... 33 4 Mine Safety Disclosures ............................................................................................................................................ 33 Part II 5 Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities................................................................................................................................................... 34 6 Selected Financial Data ............................................................................................................................................. 36 7 Management's Discussion and Analysis of Financial Condition and Results of Operations ..................................... 37 7A. Quantitative and Qualitative Disclosures About Market Risk................................................................................... 74 8 Financial Statements and Supplementary Data.......................................................................................................... 75 9 Changes in and Disagreements With Accountants on Accounting and Financial Disclosure ................................... 134 9A. Controls and Procedures ............................................................................................................................................ 134 9B. Other Information ...................................................................................................................................................... 134 Part III 10 Directors, Executive Officers and Corporate Governance......................................................................................... 135 11 Executive Compensation ........................................................................................................................................... 137 12 Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters .................. 138 13 Certain Relationships and Related Transactions, and Director Independence........................................................... 138 14 Principal Accounting Fees and Services.................................................................................................................... 138 Part IV 15 Exhibits, Financial Statement Schedules ................................................................................................................... 139 Exhibits Index............................................................................................................................................................ 140 16 Form 10-K Summary ................................................................................................................................................ 144 Signatures .................................................................................................................................................................. 145 2 THE HANOVER INSURANCE GROUP | 2018 ANNUAL REPORT