---
schema_version: "secwatch.filing_event.v1"
accession: "0001564590-22-011912"
form_type: "8-K"
ticker: "THG"
cik: "0000944695"
company_name: "HANOVER INSURANCE GROUP, INC."
filed_at: "2022-03-28T23:59:59+00:00"
generated_at: "2026-06-26T16:57:34.766368+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "high"
source: SEC EDGAR
---

# Hanover to split Commercial Lines into Core Commercial & Specialty; historic data refiled 2019-2021

## Summary
- Disaggregates former Commercial Lines into Core Commercial and Specialty segments including expenses and NII.
- Expands top-line reporting: will provide net premiums written, renewal price change, retention by sub-segment.
- Will no longer report supplemental loss ratio by product line for Core Commercial segment.
- Personal Lines: homeowners sub-segment combined with other personal lines (umbrella).
- First quarter 2022 results expected after market close May 3; webcast May 4.

## SEC filing metadata
- accession: 0001564590-22-011912
- form_type: 8-K
- ticker: THG
- cik: 0000944695
- company_name: HANOVER INSURANCE GROUP, INC.
- filed_at: 2022-03-28T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/944695/000156459022011912/0001564590-22-011912-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/944695/000156459022011912/thg-8k_20220328.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001564590-22-011912
- JSON: https://secwatch.observer/filing/0001564590-22-011912.json
- Plain text: https://secwatch.observer/filing/0001564590-22-011912.txt

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