secwatch.observer — SEC 8-K summary
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Issuer:     WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK:        0000776867
Form:       8-K
Filed at:   2025-02-07T23:59:59+00:00
Accession:  0000776867-25-000002
Event type: earnings
Sentiment:  negative
Materiality: 0.80
Item codes: 2.02, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

White Mountains Q4 ABVPS down 3% on $122M MediaAlpha loss; full-year ABVPS up 8%
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- Adjusted book value per share $1,834 at Dec 31, 2024, down 3% QoQ; full-year gain 8% including dividends.
- Comprehensive loss attributable to common shareholders $131M in Q4 2024 vs $288M income in Q4 2023.
- Ark combined ratio 77% in Q4; gross written premiums $264M (+14% YoY); Kudu portfolio exceeds $1B.
- Bamboo managed premiums doubled to $484M; MGA adjusted EBITDA $53M, up seven-fold YoY.
- MediaAlpha share price fell 38% to $11.29; $122M mark-to-market loss. Undeployed capital ~$700M.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/776867/000077686725000002/0000776867-25-000002-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/776867/000077686725000002/wtm-20250207.htm
  HTML page:      https://secwatch.observer/filing/0000776867-25-000002

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