secwatch.observer — SEC 8-K summary
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Issuer:     WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK:        0000776867
Form:       8-K
Filed at:   2025-12-08T23:59:59+00:00
Accession:  0001628280-25-055702
Event type: m_and_a
Sentiment:  positive
Materiality: 0.70
Item codes: 2.01, 8.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

White Mountains completes sale of controlling Bamboo stake to CVC for $848M net cash
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- Sold 77.3% equity interest in Bamboo Group for $848M net cash proceeds at closing on Dec 5, 2025.
- Retained indirect equity interest valued at $250M (approx 15% fully-diluted stake).
- Bamboo enterprise value on a cash-free/debt-free basis was $1.75B.
- Pro forma net transaction gain after tax estimated at $816.6M, increasing book value by $844.6M.
- Net proceeds include $3.6M held in escrow expected release in H1 2026.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/776867/000162828025055702/0001628280-25-055702-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/776867/000162828025055702/wtm-20251205.htm
  HTML page:      https://secwatch.observer/filing/0001628280-25-055702

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer