---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-25-000004"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2025-04-10T23:59:59+00:00"
generated_at: "2026-05-23T17:46:54.980727+00:00"
event_type: "m_and_a"
sentiment: "positive"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# White Mountains invests $150M alongside Ethos Capital and BCI in BroadStreet Partners

## Summary
- White Mountains to invest $150M as co-lead investor with Ethos Capital and BCI for ownership stake in BroadStreet.
- BroadStreet is a leading North American insurance brokerage with co-ownership model across 30 Core Agency Partners.
- Ontario Teachers' Pension Plan retains significant co-control stake and continues as partner.
- Investment supports BroadStreet's technology and digital transformation initiatives.
- BroadStreet operates in all 50 U.S. states and 10 Canadian provinces.

## SEC filing metadata
- accession: 0000776867-25-000004
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2025-04-10T23:59:59+00:00
- event_type: m_and_a
- sentiment: positive
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686725000004/0000776867-25-000004-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686725000004/wtm-20250410.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-25-000004
- JSON: https://secwatch.observer/filing/0000776867-25-000004.json
- Plain text: https://secwatch.observer/filing/0000776867-25-000004.txt

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