What is White Mountains Insurance Group's casualty-active — 8?

White Mountains Insurance Group (WTM) reported casualty-active — 8 of 5.1% in Q4 2025.

How has White Mountains Insurance Group's casualty-active — 8 changed year-over-year?

White Mountains Insurance Group's casualty-active — 8 increased by 6.2% year-over-year, from 4.8% to 5.1%.

What does casualty-active — 8 mean?

Measures the variance between previously established loss reserves and current estimates for the Casualty-Active segment. This metric highlights the company's ability to accurately forecast claims costs over time.

White Mountains Insurance Group WTM Casualty-Active — 8

Other product segments

Casualty-Runoff

4.2%+2.4%

Specialty

1.8%0.0%

Property and Accident & Health

0.9%+12.5%

Marine & Energy

0.4%0.0%

Similar metrics at other companies

EGCasualty Insurance — Year eight

12.8%—

RLICasualty — Short Duration Insurance Contracts Historical Claim Duration Year Eight

8.8%+0.5pp

EGCasualty Insurance — Year seven

16%—

ACGLCasualty — Year Eight

6.8%-0.4pp

KNSLCasualty - claims made — Historical Claims Duration, Year Eight

2.4%-0.6pp

RLICasualty — Assumed Premiums Earned

$6.09M-3.1%

Other financials

Income statement

See full

Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

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Total debt$834.8M+23.5%

Total equity$5.4B+19.2%

Total assets$13.2B+19.7%

Cash flow

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Operating cash flow$30.5M+176%

Valuation

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Market cap$4.99B+9.8%

Profitability

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Gross margin94.9%-3.7pp

Net margin28.4%—

Returns & leverage

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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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight.

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 — 8?: White Mountains Insurance Group (WTM) reported casualty-active — 8 of 5.1% in Q4 2025.
How has White Mountains Insurance Group's casualty-active — 8 changed year-over-year?: White Mountains Insurance Group's casualty-active — 8 increased by 6.2% year-over-year, from 4.8% to 5.1%.
What does casualty-active — 8 mean?: Measures the variance between previously established loss reserves and current estimates for the Casualty-Active segment. This metric highlights the company's ability to accurately forecast claims costs over time.