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White Mountains Insurance Group WTM Property and Accident & Health — 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 property and accident & health — prior year?
- White Mountains Insurance Group (WTM) reported property and accident & health — prior year of -$22.93M in Q4 2025.
- How has White Mountains Insurance Group's property and accident & health — prior year changed year-over-year?
- White Mountains Insurance Group's property and accident & health — prior year decreased by 414.0% year-over-year, from $7.3M to -$22.93M.
- What is the long-term trend for White Mountains Insurance Group's property and accident & health — prior year?
- Over 4 years (2021 to 2025), White Mountains Insurance Group's property and accident & health — prior year has grown at a 79.2% compound annual growth rate (CAGR), from $8.9M to -$91.7M.
- What does property and accident & health — prior year mean?
- This metric represents the net favorable or unfavorable development of loss reserves established in previous reporting periods for the Property and Accident & Health segment. It reflects the accuracy of initial actuarial estimates compared to actual claim settlements over time. Positive values indicate reserve releases, while negative values indicate reserve strengthening.
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