What is White Mountains Insurance Group's casualty-active — 2?

White Mountains Insurance Group (WTM) reported casualty-active — 2 of 7.5% in Q4 2025.

How has White Mountains Insurance Group's casualty-active — 2 changed year-over-year?

White Mountains Insurance Group's casualty-active — 2 decreased by 10.7% year-over-year, from 8.4% to 7.5%.

What does casualty-active — 2 mean?

Represents the net favorable or unfavorable development of loss reserves from prior accident years within the Casualty-Active insurance segment. This metric reflects the accuracy of initial loss estimates and the impact of subsequent claims experience on underwriting profitability.

White Mountains Insurance Group WTM Casualty-Active — 2

Other product segments

Property and Accident & Health

31.9%-2.7%

Marine & Energy

27.1%-11.1%

Specialty

26.8%-13.0%

Casualty-Runoff

13.9%-1.4%

Similar metrics at other companies

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

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

RLICasualty — Premiums Earned Net

$248.57M+8.5%

ACGLCasualty — Net premiums earned

$358M+31.6%

RLICasualty — Revenue

$248.57M+8.5%

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

$7.29M+252%

CINFCommercial Casualty Line — 4

16.9%+0.1pp

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearTwo.

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-active — 2?: White Mountains Insurance Group (WTM) reported casualty-active — 2 of 7.5% in Q4 2025.
How has White Mountains Insurance Group's casualty-active — 2 changed year-over-year?: White Mountains Insurance Group's casualty-active — 2 decreased by 10.7% year-over-year, from 8.4% to 7.5%.
What does casualty-active — 2 mean?: Represents the net favorable or unfavorable development of loss reserves from prior accident years within the Casualty-Active insurance segment. This metric reflects the accuracy of initial loss estimates and the impact of subsequent claims experience on underwriting profitability.