secwatch.observer — SEC 8-K summary
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Issuer:     WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK:        0000776867
Form:       8-K
Filed at:   2024-11-06T23:59:59+00:00
Accession:  0000776867-24-000018
Event type: earnings
Sentiment:  positive
Materiality: 0.85
Item codes: 2.02, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

White Mountains Q3 ABVPS up 6% to $1,883; Ark combined ratio improves to 79%
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- Adjusted book value per share of $1,883, up 6% in Q3 and 11% YTD including dividends.
- Ark reported combined ratio of 79% (vs 81% prior year) and GWP of $374M (+49% YoY).
- BAM deconsolidation effective July 1; surplus notes fair valued at $411M, causing $99M pre-tax unrealized loss.
- Bamboo managed premiums doubled to $148M; MGA adjusted EBITDA hit record $19M.
- MediaAlpha share price up 38% to $18.11; contributed $88M unrealized gain in Q3.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/776867/000077686724000018/0000776867-24-000018-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/776867/000077686724000018/wtm-20241105.htm
  HTML page:      https://secwatch.observer/filing/0000776867-24-000018

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