---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-24-000002"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2024-01-03T23:59:59+00:00"
generated_at: "2026-06-07T04:56:56.303668+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# White Mountains closes acquisition of 72.8% of Bamboo IDE8 for $296.7M

## Summary
- Closed merger and primary investment in Bamboo IDE8 Insurance Services on January 2, 2024.
- Acquired approximately 72.8% of Bamboo's equity for $296.7 million in cash.
- Transaction completed through indirect subsidiaries PM Holdings and WM Pierce Merger Sub.
- Bamboo becomes a consolidated subsidiary of White Mountains.

## SEC filing metadata
- accession: 0000776867-24-000002
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2024-01-03T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686724000002/0000776867-24-000002-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686724000002/wtm-20240102.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-24-000002
- JSON: https://secwatch.observer/filing/0000776867-24-000002.json
- Plain text: https://secwatch.observer/filing/0000776867-24-000002.txt

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