What is White Mountains Insurance Group's casualty-runoff — 9?

White Mountains Insurance Group (WTM) reported casualty-runoff — 9 of 3.2% in Q4 2025.

How has White Mountains Insurance Group's casualty-runoff — 9 changed year-over-year?

White Mountains Insurance Group's casualty-runoff — 9 increased by 3.2% year-over-year, from 3.1% to 3.2%.

What does casualty-runoff — 9 mean?

This metric represents the risk-adjusted return on capital for the casualty runoff segment. It evaluates the profitability of the segment relative to the capital required to support the underlying legacy liabilities. This is a primary measure for determining the value-add of maintaining runoff operations.

White Mountains Insurance Group WTM Casualty-Runoff — 9

Other product segments

Casualty-Active

4.2%+13.5%

Specialty

1.2%-7.7%

Property and Accident & Health

0.2%+100%

Marine & Energy

0.1%-66.7%

Similar metrics at other companies

RLICasualty — Revenue

$248.57M+8.5%

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

RLICasualty — Ceded Premiums Earned

$49.44M+8.5%

BHFRun-off — Policyholder benefits and claims

$343M-2.6%

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

$30.75M+108%

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine.

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 — 9?: White Mountains Insurance Group (WTM) reported casualty-runoff — 9 of 3.2% in Q4 2025.
How has White Mountains Insurance Group's casualty-runoff — 9 changed year-over-year?: White Mountains Insurance Group's casualty-runoff — 9 increased by 3.2% year-over-year, from 3.1% to 3.2%.
What does casualty-runoff — 9 mean?: This metric represents the risk-adjusted return on capital for the casualty runoff segment. It evaluates the profitability of the segment relative to the capital required to support the underlying legacy liabilities. This is a primary measure for determining the value-add of maintaining runoff operations.