What is White Mountains Insurance Group's casualty-runoff — 3?

White Mountains Insurance Group (WTM) reported casualty-runoff — 3 of 15.3% in Q4 2025.

How has White Mountains Insurance Group's casualty-runoff — 3 changed year-over-year?

White Mountains Insurance Group's casualty-runoff — 3 decreased by 1.9% year-over-year, from 15.6% to 15.3%.

What does casualty-runoff — 3 mean?

This metric tracks the underwriting results specifically associated with the casualty runoff business line. It measures the profitability of managing legacy insurance liabilities that are no longer actively marketed. Effective management of these liabilities is critical for capital preservation and long-term segment stability.

White Mountains Insurance Group WTM Casualty-Runoff — 3

Other product segments

Property and Accident & Health

18.4%+0.5%

Marine & Energy

17.3%-11.3%

Specialty

13.2%+21.1%

Casualty-Active

11.4%-1.7%

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

ACGLCasualty — All outstanding liabilities before 2016, net of reinsurance

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

RNRCasualty and Specialty — Combined Ratio

100.4%-10.7pp

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

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

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree.

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 — 3?: White Mountains Insurance Group (WTM) reported casualty-runoff — 3 of 15.3% in Q4 2025.
How has White Mountains Insurance Group's casualty-runoff — 3 changed year-over-year?: White Mountains Insurance Group's casualty-runoff — 3 decreased by 1.9% year-over-year, from 15.6% to 15.3%.
What does casualty-runoff — 3 mean?: This metric tracks the underwriting results specifically associated with the casualty runoff business line. It measures the profitability of managing legacy insurance liabilities that are no longer actively marketed. Effective management of these liabilities is critical for capital preservation and long-term segment stability.