White Mountains Insurance Group (WTM) Casualty-Runoff — Cumulative number of reported claims — Quarterly & Annual

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CINFCommercial Casualty Line — Cumulative number of reported claims

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CINFHomeowner — Cumulative number of reported claims

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UFCSPersonal — Cumulative number of reported claims

1,712,800,000%+500,000pp

KNSLProperty — Cumulative number of reported claims

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Other financials

Income statement

Revenue$844.6M+22.5%

Gross profit$764.5M+18.2%

Net income$199.5M+62.3%

Balance sheet

Total debt$932.5M+34.2%

Total equity$5.4B+16.0%

Total assets$13.8B+16.4%

Cash flow

Operating cash flow-$55.5M-131%

Valuation

Market cap$5.3B+15.6%

P/E4.7×—

P/S1.4×-0.5×

Profitability

Gross margin94.1%-3.2pp

Net margin29.3%—

Returns & leverage

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:ShortdurationInsuranceContractsNumberOfReportedClaims.

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

Casualty-Runoff / $ in Millions / Accident Year	Casualty-Runoff / $ in Millions / Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2016	Casualty-Runoff / $ in Millions / Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2017	Casualty-Runoff / Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2018	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2019	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2020	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2021	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2022	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2023	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2024	Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2025	As of December 31, 2025 / Total IBNR plus expected development on reported claims	As of December 31, 2025 / Cumulative number of reported claims
	Unaudited
2016	$32.6	$32.3	$40.5	$38.6	$38.9	$38.6	$37.7	$37.5	$37.5	$38.1	$1.9	2,156
2017		30.7	34.0	31.5	32.1	31.6	29.9	28.3	28.5	27.9	2.0	1,606
2018			33.6	28.2	27.3	26.6	26.2	28.0	27.8	28.2	2.9	1,284
2019				26.5	23.3	23.4	24.9	23.6	23.7	22.5	4.2	976
2020					15.9	12.3	13.9	10.9	9.5	9.2	2.3	573
2021						10.5	7.0	5.5	4.5	3.9	1.5	284
2022							.8	2.6	2.6	2.3	1.3	80

Item 16. Form 10-K Summary.

FAQ

What is White Mountains Insurance Group's casualty-runoff — cumulative number of reported claims?: White Mountains Insurance Group (WTM) reported casualty-runoff — cumulative number of reported claims of 215,600% in Q4 2025.
How has White Mountains Insurance Group's casualty-runoff — cumulative number of reported claims changed year-over-year?: White Mountains Insurance Group's casualty-runoff — cumulative number of reported claims increased by 0.3% year-over-year, from 215,000% to 215,600%.
What does casualty-runoff — cumulative number of reported claims mean?: The total count of claims reported to the company since the inception of the casualty runoff portfolio. This metric provides insight into the volume of activity and the maturity profile of the claims portfolio.

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