---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-25-000013"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2025-08-07T23:59:59+00:00"
generated_at: "2026-05-17T18:39:03.898612+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# White Mountains Q2 BVPS +3% to $1,804; Ark combined ratio 84%, Bamboo record quarter

## Summary
- BVPS $1,804 (+3% for Q2 and H1); comprehensive income $124M vs -$55M prior year.
- Ark combined ratio 84% (improved from 87%); GWP $815M (+17% YoY).
- Bamboo MGA pre-tax $15M, MGA adj. EBITDA $26M; managed premiums $191M (+59% YoY).
- HG Global GWP $19M (record Q2, +66% YoY); Kudu adj. EBITDA $16M, ROE 8%.
- Completed BroadStreet deal, announced Distinguished acquisition; undeployed capital ~$300M.

## SEC filing metadata
- accession: 0000776867-25-000013
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2025-08-07T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686725000013/0000776867-25-000013-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686725000013/wtm-20250807.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-25-000013
- JSON: https://secwatch.observer/filing/0000776867-25-000013.json
- Plain text: https://secwatch.observer/filing/0000776867-25-000013.txt

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