secwatch.observer — SEC 8-K summary
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Issuer:     WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK:        0000776867
Form:       8-K
Filed at:   2026-02-06T23:59:59+00:00
Accession:  0001628280-26-005947
Event type: earnings
Sentiment:  positive
Materiality: 0.80
Item codes: 2.02, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

White Mountains Q4 BVPS +18%, full-year +25%; Bamboo sale adds ~$320
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- Book value per share $2,188 at Dec 31, 2025, up 18% QoQ and 25% YoY including dividends.
- Comprehensive income $837M in Q4 and $1,109M full-year 2025 vs. losses of $131M and $230M in prior year.
- Ark combined ratio 79% Q4 (10 pts cat) and 83% full-year; GWP +16% to $2.6B.
- Closed sale of Bamboo to CVC for net cash $848M; retained 15% equity stake valued at $250M.
- Repurchased ~$190M of shares in Q4 via open market and self-tender; undeployed capital ~$1.0B.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/776867/000162828026005947/0001628280-26-005947-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/776867/000162828026005947/wtm-20260206.htm
  HTML page:      https://secwatch.observer/filing/0001628280-26-005947

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