What is White Mountains Insurance Group's casualty-active — 7?

White Mountains Insurance Group (WTM) reported casualty-active — 7 of 7.2% in Q4 2025.

How has White Mountains Insurance Group's casualty-active — 7 changed year-over-year?

White Mountains Insurance Group's casualty-active — 7 increased by 14.3% year-over-year, from 6.3% to 7.2%.

What does casualty-active — 7 mean?

Reflects the net impact of prior year reserve movements on the current period's underwriting results for the Casualty-Active business line. It is a critical metric for investors to evaluate the volatility and reliability of the segment's reported earnings.

White Mountains Insurance Group WTM Casualty-Active — 7

Other product segments

Casualty-Runoff

5.9%0.0%

Specialty

2.1%+40.0%

Marine & Energy

0.5%+66.7%

Property and Accident & Health

0.4%-20.0%

Similar metrics at other companies

ACGLCasualty — Net premiums earned

$358M+31.6%

RLICasualty — Revenue

$248.57M+8.5%

RLICasualty — Premiums Earned Net

$248.57M+8.5%

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

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

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

$7.29M+252%

SIGICasualty lines — Net premiums earned

$89.51M+5.2%

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSeven.

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 — 7?: White Mountains Insurance Group (WTM) reported casualty-active — 7 of 7.2% in Q4 2025.
How has White Mountains Insurance Group's casualty-active — 7 changed year-over-year?: White Mountains Insurance Group's casualty-active — 7 increased by 14.3% year-over-year, from 6.3% to 7.2%.
What does casualty-active — 7 mean?: Reflects the net impact of prior year reserve movements on the current period's underwriting results for the Casualty-Active business line. It is a critical metric for investors to evaluate the volatility and reliability of the segment's reported earnings.