---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-25-000009"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2025-07-07T23:59:59+00:00"
generated_at: "2026-05-18T09:23:40.689456+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# White Mountains acquires 51% controlling interest in Distinguished Programs for $230M

## Summary
- Acquisition includes existing ~1% interest; total cash consideration ~$230M for 51% controlling stake.
- Distinguished places >$550M in annual premium across 12 specialty P&C programs (real estate, cyber, surety, etc.).
- Current management (Bill Malloy, Jason Rotman, Steve Sitterly) to remain as significant equityholders.
- Sellers can sell additional 29% units 3 years after close for ~$130M; White Mountains has parallel call at 1.35x price.
- Expected close Q3 2025, subject to regulatory approvals; no financing condition or shareholder vote required.

## SEC filing metadata
- accession: 0000776867-25-000009
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2025-07-07T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686725000009/0000776867-25-000009-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686725000009/wtm-20250704.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-25-000009
- JSON: https://secwatch.observer/filing/0000776867-25-000009.json
- Plain text: https://secwatch.observer/filing/0000776867-25-000009.txt

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