# EDGAR Filing Document

**Accession Number:** 0000944695
**File Stem:** 0001193125-26-125014
**Filing Date:** 2026-3
**Character Count:** 1229
**Document Hash:** c959a77a269755089a65334c07137d60
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-125014.hdr.sgml**: 20260326

**ACCESSION NUMBER**: 0001193125-26-125014

**CONFORMED SUBMISSION TYPE**: ARS

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251231

**FILED AS OF DATE**: 20260326

**DATE AS OF CHANGE**: 20260326

**EFFECTIVENESS DATE**: 20260326

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** HANOVER INSURANCE GROUP, INC.
- **CENTRAL INDEX KEY:** 0000944695
- **STANDARD INDUSTRIAL CLASSIFICATION:** FIRE, MARINE & CASUALTY INSURANCE [6331]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 043263626
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** ARS
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-13754
- **FILM NUMBER:** 26794256

**BUSINESS ADDRESS:**
- **STREET 1:** 440 LINCOLN ST
- **CITY:** WORCESTER
- **STATE:** MA
- **ZIP:** 01653
- **BUSINESS PHONE:** 5088551000

**MAIL ADDRESS:**
- **STREET 1:** 440 LINCOLN ST
- **CITY:** WORCESTER
- **STATE:** MA
- **ZIP:** 01653

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ALLMERICA FINANCIAL CORP
- **DATE OF NAME CHANGE:** 19950501

### Attached PDF Documents

**Attachment 1:** `thg_2025_ars.pdf`

_No text found in this document._