---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-24-000014"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2024-08-07T23:59:59+00:00"
generated_at: "2026-05-31T11:58:08.880394+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# White Mountains Q2 ABVPS down 1% on MediaAlpha loss; operating units post solid growth

## Summary
- ABVPS down 1% to $1,777; comprehensive loss $55M vs $21M profit a year ago.
- MediaAlpha share price fell 35%, causing $139M net loss; ownership now 27%.
- Ark combined ratio 89%; gross written premiums up 15% to $697M.
- Bamboo managed premiums tripled to $120M; MGA adjusted EBITDA record $12M.
- Kudu trailing 12-month adjusted EBITDA $60M; undeployed capital ~$650M.

## SEC filing metadata
- accession: 0000776867-24-000014
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2024-08-07T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686724000014/0000776867-24-000014-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686724000014/wtm-20240806.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-24-000014
- JSON: https://secwatch.observer/filing/0000776867-24-000014.json
- Plain text: https://secwatch.observer/filing/0000776867-24-000014.txt

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