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White Mountains Insurance Group WTM Specialty — 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 specialty — prior year?
- White Mountains Insurance Group (WTM) reported specialty — prior year of -$6.8M in Q4 2025.
- How has White Mountains Insurance Group's specialty — prior year changed year-over-year?
- White Mountains Insurance Group's specialty — prior year decreased by 179.3% year-over-year, from $8.58M to -$6.8M.
- What is the long-term trend for White Mountains Insurance Group's specialty — prior year?
- Over 4 years (2021 to 2025), White Mountains Insurance Group's specialty — prior year has grown at a 69.4% compound annual growth rate (CAGR), from $3.3M to -$27.2M.
- What does specialty — prior year mean?
- This metric represents the net favorable or unfavorable development of loss reserves established in prior reporting periods for the Specialty insurance segment. It reflects the accuracy of initial actuarial estimates and the impact of subsequent claims experience on the company's historical underwriting results.
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