---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-23-000012"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2023-08-07T23:59:59+00:00"
generated_at: "2026-06-12T05:13:28.105213+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# White Mountains reports 1% ABVPS increase in Q2; Ark GWP up 50% YoY

## Summary
- Book value per share $1,532; adjusted book value per share $1,576 as of June 30, 2023.
- Ark combined ratio 89%; gross written premiums $606M (+50% YoY); risk-adjusted rate change +21%.
- MediaAlpha share price decline reduced ABVPS by 2%; tender offer for 5.9M shares at $10.00 completed.
- BAM gross written premiums & MSC down to $26M in Q2 from $41M last year; pricing up to 77 bps.
- Total consolidated portfolio return excluding MediaAlpha: 3.0%; repurchased 5,542 shares for $7M.

## SEC filing metadata
- accession: 0000776867-23-000012
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2023-08-07T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686723000012/0000776867-23-000012-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686723000012/wtm-20230807.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-23-000012
- JSON: https://secwatch.observer/filing/0000776867-23-000012.json
- Plain text: https://secwatch.observer/filing/0000776867-23-000012.txt

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