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

Screener

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

HGBermuda - Casualty — 9

4%—

HGInternational - Casualty — 9

0%—

FRHCCivil Liability — 9

0%—

FRHCLife Insurance — 9

0%—

FRHCMotor Vehicle — 9

0%—

FRHCProperty Damage — 9

0%—

Other financials

Income statement

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Revenue$844.6M+22.5%

Gross profit$764.5M+18.2%

Net income$199.5M+62.3%

Balance sheet

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Total debt$932.5M+34.2%

Total equity$5.4B+16.0%

Total assets$13.8B+16.4%

Cash flow

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Operating cash flow-$55.5M-131%

Valuation

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Market cap$5.3B+15.6%

P/E4.7×—

P/S1.4×-0.5×

Profitability

See full

Gross margin94.1%-3.2pp

Net margin29.3%—

Returns & leverage

See full

Return on equity22.4%—

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 source filing: White Mountains Insurance Group’s 10-K, filed February 27, 2026.

Filed: Feb 27, 2026, 9:21 AM EST
Fiscal year: FY2025
Accession: 0001628280-26-012603

Casualty-Runoff	Casualty-Runoff / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Casualty-Runoff / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Casualty-Runoff / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Casualty-Runoff / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance
Years	1	2	3	4	5	6	7	8	9	10
	8.8%	13.9%	15.3%	14.8%	8.5%	6.7%	5.9%	4.2%	3.2%	2.2%

Item 16. Form 10-K Summary.

FAQ

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.