What does property and accident & health — 8 mean?

This metric tracks the net development of prior year loss reserves specifically for the Property and Accident & Health business line. It provides transparency into how historical underwriting outcomes are impacting current period earnings. Monitoring this metric helps investors gauge the stability of the segment's loss reserves.

White Mountains Insurance Group (WTM) Property and Accident & Health — 8

Screener

Other product segments

Casualty-Active

5.1%+6.2%

Casualty-Runoff

4.2%+2.4%

Specialty

1.8%0.0%

Marine & Energy

0.4%0.0%

Similar metrics at other companies

FRHCAccident Insurance — 8

0%—

FRHCProperty Damage — 8

0%—

HGBermuda - Property — 8

0%—

HGInternational - Property — 8

1%0.0pp

FRHCCivil Liability — 8

0%—

FRHCLife Insurance — 8

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight.

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 — 8?: White Mountains Insurance Group (WTM) reported property and accident & health — 8 of 0.9% in Q4 2025.
How has White Mountains Insurance Group's property and accident & health — 8 changed year-over-year?: White Mountains Insurance Group's property and accident & health — 8 increased by 12.5% year-over-year, from 0.8% to 0.9%.
What does property and accident & health — 8 mean?: This metric tracks the net development of prior year loss reserves specifically for the Property and Accident & Health business line. It provides transparency into how historical underwriting outcomes are impacting current period earnings. Monitoring this metric helps investors gauge the stability of the segment's loss reserves.