What does property and accident & health — 4 mean?

This metric tracks the net impact of prior year loss reserve development within the Property and Accident & Health insurance portfolio. It highlights the financial consequences of re-evaluating claims that occurred in previous fiscal years. A consistent trend in this metric provides insight into the long-term underwriting discipline of the segment.

White Mountains Insurance Group (WTM) Property and Accident & Health — 4

Screener

Other product segments

Casualty-Runoff

14.8%0.0%

Casualty-Active

12.9%-10.4%

Marine & Energy

12.1%+51.2%

Specialty

8.7%+77.6%

Similar metrics at other companies

FRHCAccident Insurance — 4

2.3%—

FRHCProperty Damage — 4

22%-6.3pp

HIPOProperty Lines — 4

3%—

HGBermuda - Property — 4

10%-1.0pp

HGInternational - Property — 4

11%-1.0pp

FRHCCivil Liability — 4

4%-17.3pp

Other financials

Income statement

See full

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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearFour.

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 — 4?: White Mountains Insurance Group (WTM) reported property and accident & health — 4 of 6.4% in Q4 2025.
How has White Mountains Insurance Group's property and accident & health — 4 changed year-over-year?: White Mountains Insurance Group's property and accident & health — 4 decreased by 0.0% year-over-year, from 6.4% to 6.4%.
What does property and accident & health — 4 mean?: This metric tracks the net impact of prior year loss reserve development within the Property and Accident & Health insurance portfolio. It highlights the financial consequences of re-evaluating claims that occurred in previous fiscal years. A consistent trend in this metric provides insight into the long-term underwriting discipline of the segment.