---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-24-000003"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2024-02-07T23:59:59+00:00"
generated_at: "2026-06-06T07:30:02.194481+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# White Mountains reports Q4 2023 ABVPS up 7% to $1,704; full-year ABVPS up 14%

## Summary
- Comprehensive income attributable to common shareholders: $288M Q4, $511M full year 2023.
- BAM gross written premiums and MSC: $48M Q4, $131M full year; par insured $5.1B Q4.
- Ark combined ratio 70% Q4 and 82% full year; gross written premiums up 31% YoY.
- Kudu adjusted EBITDA $22M Q4, $57M full year; net investment income up 31% YoY.
- Bermuda 15% corporate income tax enacted Dec 2023; White Mountains exempt until 2030, recorded $68M deferred tax benefit.

## SEC filing metadata
- accession: 0000776867-24-000003
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2024-02-07T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- 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/776867/000077686724000003/0000776867-24-000003-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686724000003/wtm-20240207.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-24-000003
- JSON: https://secwatch.observer/filing/0000776867-24-000003.json
- Plain text: https://secwatch.observer/filing/0000776867-24-000003.txt

## Key facts
- Earnings Releases
  WHITE MOUNTAINS INSURANCE GROUP LTD reported financial results for the year ended December 31, 2023.
  - Period: the year ended December 31, 2023
  - Result: reported results
  source text: On February 7, 2024, White Mountains Insurance Group, Ltd. issued a press release announcing its results for the year ended December 31, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/776867/000077686724000003/0000776867-24-000003-index.htm

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