What is White Mountains Insurance Group's casualty-runoff — 1?

White Mountains Insurance Group (WTM) reported casualty-runoff — 1 of 8.8% in Q4 2025.

How has White Mountains Insurance Group's casualty-runoff — 1 changed year-over-year?

White Mountains Insurance Group's casualty-runoff — 1 decreased by 0.0% year-over-year, from 8.8% to 8.8%.

What does casualty-runoff — 1 mean?

A primary indicator representing the aggregate financial position or a specific key performance driver for the casualty runoff segment. This metric is used to monitor the overall health and capital requirements of the runoff business unit.

White Mountains Insurance Group WTM Casualty-Runoff — 1

Other product segments

Property and Accident & Health

27.4%+15.1%

Specialty

18.2%-5.7%

Marine & Energy

12.1%-6.2%

Casualty-Active

3.8%-13.6%

Similar metrics at other companies

KNSLCasualty - occurrence — Reinsurance recoverable for unpaid losses

$246.89M+21.3%

RLICasualty — Revenue

$248.57M+8.5%

RLICasualty — Reinsurance Recoverable For Unpaid Claims And Claims Adjustments

$276.29M-2.6%

KNSLCasualty - occurrence — Cumulative number of reported claims

479,200%+96,000pp

RLICasualty — Ceded Premiums Earned

$49.44M+8.5%

SIGICasualty lines — Total

$1.41B+648%

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%

P/E4.8×—

P/S1.4×-0.7×

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearOne.

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 — 1?: White Mountains Insurance Group (WTM) reported casualty-runoff — 1 of 8.8% in Q4 2025.
How has White Mountains Insurance Group's casualty-runoff — 1 changed year-over-year?: White Mountains Insurance Group's casualty-runoff — 1 decreased by 0.0% year-over-year, from 8.8% to 8.8%.
What does casualty-runoff — 1 mean?: A primary indicator representing the aggregate financial position or a specific key performance driver for the casualty runoff segment. This metric is used to monitor the overall health and capital requirements of the runoff business unit.