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White Mountains Insurance Group WTM Casualty-Active — Prior Year
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Where this comes from
Reported directly by White Mountains Insurance Group in its filing.
Tagged under the XBRL concept us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense.
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
| Millions | Year Ended December 31, 2025 | Year Ended December 31, 2024 | Year Ended December 31, 2023 |
|---|---|---|---|
| Net loss and LAE reserves | 1,693.1 | 1,264.3 | 791.5 |
| Loss and LAE incurred relating to: | |||
| Current year losses | 956.9 | 914.4 | 706.9 |
| Prior year losses | (112.7) | (58.6) | 19.9 |
| Net incurred loss and LAE | 844.2 | 855.8 | 726.8 |
| Loss and LAE paid relating to: | |||
| Current year losses | (205.6) | (109.2) | (51.3) |
| Prior year losses | (380.1) | (307.5) | (356.6) |
Item 16. Form 10-K Summary.
FAQ
- What is White Mountains Insurance Group's casualty-active — prior year?
- White Mountains Insurance Group (WTM) reported casualty-active — prior year of $1.08M in Q4 2025.
- How has White Mountains Insurance Group's casualty-active — prior year changed year-over-year?
- White Mountains Insurance Group's casualty-active — prior year decreased by 4.4% year-over-year, from $1.13M to $1.08M.
- What is the long-term trend for White Mountains Insurance Group's casualty-active — prior year?
- Over 2 years (2021 to 2025), White Mountains Insurance Group's casualty-active — prior year has grown at a 7.8% compound annual growth rate (CAGR), from $3.7M to $4.3M.
- What does casualty-active — prior year mean?
- Represents the prior year loss development or adjustments recognized within the Casualty-Active segment. This metric reflects changes in estimates for claims occurring in previous periods, indicating the accuracy of initial underwriting and reserving assumptions.
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