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

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Similar metrics at other companies

KNSLCasualty - claims made — Cumulative number of reported claims

162,900%+16,200pp

KNSLCasualty - occurrence — Cumulative number of reported claims

479,200%+96,000pp

CINFCommercial Casualty Line — Cumulative number of reported claims

2,300,000%0.0pp

CINFHomeowner — Cumulative number of reported claims

2,400,000%0.0pp

UFCSPersonal — Cumulative number of reported claims

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

KNSLProperty — Cumulative number of reported claims

234,900%+300pp

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-Active / $ in Millions / Accident Year	Casualty-Active / $ in Millions / Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2016	Casualty-Active / $ in Millions / Incurred Loss and LAE, Net of Reinsurance / For the Years Ended December 31, 2017	Casualty-Active / 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
2019				14.8	13.7	12.3	10.6	11.4	13.0	14.4	1.4	1,062
2020					13.5	12.1	10.9	9.2	8.8	9.5	1.7	731
2021						21.4	22.4	16.6	16.3	21.7	4.1	1,050
2022							33.0	38.1	34.7	17.3	9.8	1,774
2023								61.0	65.9	57.1	39.4	2,234
2024									60.0	82.0	71.9	2,171
2025										68.2	63.4	1,723
									Total	$303.2

Item 16. Form 10-K Summary.

FAQ

What is White Mountains Insurance Group's casualty-active — cumulative number of reported claims?: White Mountains Insurance Group (WTM) reported casualty-active — cumulative number of reported claims of 223,400% in Q4 2025.
What does casualty-active — cumulative number of reported claims mean?: The total count of insurance claims reported to the company within the Casualty-Active segment since inception. This metric provides insight into the volume of activity and the scale of the segment's insurance portfolio.

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