---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-068804"
form_type: "8-K"
ticker: "THG"
cik: "0000944695"
company_name: "HANOVER INSURANCE GROUP, INC."
filed_at: "2023-12-07T23:59:59+00:00"
generated_at: "2026-06-07T16:41:59.057659+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# Hanover Insurance Group Controller Warren Barnes announces retirement effective April 1, 2025

## Summary
- Warren E. Barnes, SVP, Corporate Controller and Principal Accounting Officer, intends to retire on April 1, 2025.
- Mr. Barnes communicated his intention on December 5, 2023; has been with the company since 1993.
- No replacement named; Barnes has served as Principal Accounting Officer since 2015 and Controller since 1997.

## SEC filing metadata
- accession: 0000950170-23-068804
- form_type: 8-K
- ticker: THG
- cik: 0000944695
- company_name: HANOVER INSURANCE GROUP, INC.
- filed_at: 2023-12-07T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/944695/000095017023068804/0000950170-23-068804-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/944695/000095017023068804/thg-20231205.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-068804
- JSON: https://secwatch.observer/filing/0000950170-23-068804.json
- Plain text: https://secwatch.observer/filing/0000950170-23-068804.txt

## Key facts
- Executive change
  Warren E. Barnes departed as Senior Vice President, Corporate Controller and Principal Accounting Officer at HANOVER INSURANCE GROUP, INC..
  - Action: retire
  - Role: Senior Vice President, Corporate Controller and Principal Accounting Officer
  source text: On December 5, 2023, Warren E. Barnes, the Senior Vice President, Corporate Controller and Principal Accounting Officer of The Hanover Insurance Group, Inc. (the “Company”), communicated to the Company his intention to retire from the Company, currently expected to be effective April 1, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/944695/000095017023068804/0000950170-23-068804-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.