---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-25-000015"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2025-09-02T23:59:59+00:00"
generated_at: "2026-05-17T09:05:11.876536+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# White Mountains CEO Manning Rountree to retire Dec 31, 2025; Liam Caffrey to succeed

## Summary
- Manning Rountree to retire as CEO and board member on Dec 31, 2025; becomes Senior Advisor through Jan 1, 2028.
- Liam Caffrey, currently President and CFO, becomes CEO on Jan 1, 2026 and joins the board.
- Michael Papamichael succeeds Caffrey as CFO; Giles Harrison becomes President, both effective Jan 1, 2026.
- Rountree to receive $600K cash bonus for 2025 plus $300K annual salary as Senior Advisor; remains eligible for LTIP.
- Board Compensation Committee approved letter agreement with Rountree including restrictive covenants and mutual release.

## SEC filing metadata
- accession: 0000776867-25-000015
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2025-09-02T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686725000015/0000776867-25-000015-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686725000015/wtm-20250902.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-25-000015
- JSON: https://secwatch.observer/filing/0000776867-25-000015.json
- Plain text: https://secwatch.observer/filing/0000776867-25-000015.txt

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