What does property and accident & health — 3 mean?

This metric measures the underwriting performance of the Property and Accident & Health segment by isolating the impact of prior period reserve adjustments. It serves as a key indicator of the segment's historical claims estimation accuracy and the volatility of its insurance liabilities. Investors use this to assess the reliability of the company's loss reserving practices.

White Mountains Insurance Group (WTM) Property and Accident & Health — 3

Screener

Other product segments

Marine & Energy

17.3%-11.3%

Casualty-Runoff

15.3%-1.9%

Specialty

13.2%+21.1%

Casualty-Active

11.4%-1.7%

Similar metrics at other companies

FRHCAccident Insurance — 3

2.2%-14.3pp

FRHCProperty Damage — 3

30%-2.6pp

HIPOProperty Lines — 3

4%—

HGBermuda - Property — 3

13%0.0pp

HGInternational - Property — 3

19%0.0pp

FRHCCivil Liability — 3

11%+5.4pp

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearThree.

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

Property and Accident & Health	Property and Accident & Health / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Property and Accident & Health / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Property and Accident & Health / Average Annual Percentage Payout of Incurred Loss and LAE by Age, Net of Reinsurance	Property and Accident & Health / 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
	27.4%	31.9%	18.4%	6.4%	2.9%	1.9%	0.4%	0.9%	0.2%	0.1%

Item 16. Form 10-K Summary.

FAQ

What is White Mountains Insurance Group's property and accident & health — 3?: White Mountains Insurance Group (WTM) reported property and accident & health — 3 of 18.4% in Q4 2025.
How has White Mountains Insurance Group's property and accident & health — 3 changed year-over-year?: White Mountains Insurance Group's property and accident & health — 3 increased by 0.5% year-over-year, from 18.3% to 18.4%.
What does property and accident & health — 3 mean?: This metric measures the underwriting performance of the Property and Accident & Health segment by isolating the impact of prior period reserve adjustments. It serves as a key indicator of the segment's historical claims estimation accuracy and the volatility of its insurance liabilities. Investors use this to assess the reliability of the company's loss reserving practices.