What is White Mountains Insurance Group's specialty — 5?

White Mountains Insurance Group (WTM) reported specialty — 5 of 6.3% in Q4 2025.

How has White Mountains Insurance Group's specialty — 5 changed year-over-year?

White Mountains Insurance Group's specialty — 5 decreased by 13.7% year-over-year, from 7.3% to 6.3%.

What does specialty — 5 mean?

Reflects the financial impact of changes in loss reserve estimates for specialty insurance products related to prior underwriting years. This metric is essential for evaluating the historical accuracy of the company's actuarial modeling and reserve setting processes.

White Mountains Insurance Group (WTM) Specialty — 5

Screener

Other product segments

Casualty-Active

10%+5.3%

Casualty-Runoff

8.5%0.0%

Marine & Energy

6.4%+30.6%

Property and Accident & Health

2.9%+3.6%

Similar metrics at other companies

HGBermuda - Specialty — 5

10%+2.0pp

HGInternational - Specialty — 5

7%0.0pp

FRHCCivil Liability — 5

9%+5.6pp

FRHCMotor Vehicle — 5

0%—

FRHCProperty Damage — 5

6%-1.0pp

FRHCVehicle Owners — 5

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

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Gross margin94.1%-3.2pp

Net margin29.3%—

Returns & leverage

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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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFive.

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

Specialty	Specialty / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Specialty / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Specialty / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Specialty / 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
	18.2%	26.8%	13.2%	8.7%	6.3%	2.5%	2.1%	1.8%	(1.2)%	1.0%

Item 16. Form 10-K Summary.

FAQ

What is White Mountains Insurance Group's specialty — 5?: White Mountains Insurance Group (WTM) reported specialty — 5 of 6.3% in Q4 2025.
How has White Mountains Insurance Group's specialty — 5 changed year-over-year?: White Mountains Insurance Group's specialty — 5 decreased by 13.7% year-over-year, from 7.3% to 6.3%.
What does specialty — 5 mean?: Reflects the financial impact of changes in loss reserve estimates for specialty insurance products related to prior underwriting years. This metric is essential for evaluating the historical accuracy of the company's actuarial modeling and reserve setting processes.