What is White Mountains Insurance Group's casualty-runoff — 4?

White Mountains Insurance Group (WTM) reported casualty-runoff — 4 of 14.8% in Q4 2025.

How has White Mountains Insurance Group's casualty-runoff — 4 changed year-over-year?

White Mountains Insurance Group's casualty-runoff — 4 decreased by 0.0% year-over-year, from 14.8% to 14.8%.

What does casualty-runoff — 4 mean?

This metric quantifies the investment income generated by assets held to support the casualty runoff segment's liabilities. It highlights the efficiency of the asset-liability matching strategy employed for legacy portfolios. High returns on these assets contribute to the overall economic value of the runoff operations.

White Mountains Insurance Group WTM Casualty-Runoff — 4

Other product segments

Casualty-Active

12.9%-10.4%

Marine & Energy

12.1%+51.2%

Specialty

8.7%+77.6%

Property and Accident & Health

6.4%0.0%

Similar metrics at other companies

RLICasualty — Revenue

$248.57M+8.5%

ALLRun-off Property-Liability — Losses from catastrophes, net of recoveries

$30.75M+108%

RNRCasualty and Specialty — Loss Ratio

70.1%-6.0pp

RLICasualty — Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

$7.29M+252%

ACGLCasualty — Incurred losses and allocated loss adjustment expenses, net of reinsurance

521,000,000,000%+447,600,000,000pp

ACGLCasualty — All outstanding liabilities before 2016, net of reinsurance

40,600,000,000%+5,200,000,000pp

Other financials

Income statement

See full

Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

See full

Total debt$834.8M+23.5%

Total equity$5.4B+19.2%

Total assets$13.2B+19.7%

Cash flow

See full

Operating cash flow$30.5M+176%

Valuation

See full

Market cap$4.99B+9.8%

Profitability

See full

Gross margin94.9%-3.7pp

Net margin28.4%—

Returns & leverage

See full

Return on equity21.2%—

Debt / equity0.2×0.0×

Where this comes from

Reported directly by White Mountains Insurance Group in its filing.

Tagged under the XBRL concept us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour.

The official record: White Mountains Insurance Group’s 10-K, filed February 27, 2026, on SEC EDGAR. View the filing →

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Questions, answered.

What is White Mountains Insurance Group's casualty-runoff — 4?: White Mountains Insurance Group (WTM) reported casualty-runoff — 4 of 14.8% in Q4 2025.
How has White Mountains Insurance Group's casualty-runoff — 4 changed year-over-year?: White Mountains Insurance Group's casualty-runoff — 4 decreased by 0.0% year-over-year, from 14.8% to 14.8%.
What does casualty-runoff — 4 mean?: This metric quantifies the investment income generated by assets held to support the casualty runoff segment's liabilities. It highlights the efficiency of the asset-liability matching strategy employed for legacy portfolios. High returns on these assets contribute to the overall economic value of the runoff operations.