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White Mountains Insurance Group WTM Bamboo Captive — 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
| Column A / Affiliation withregistrant | Column B / Deferred acquisitioncosts | Column C / Reservesfor Unpaid Claims and Claims Adjustment Expenses | Column D / Discount, if any, deducted in Column C | Column E / Unearned Premiums | Column F / Earned Premiums | Column G / Net investmentincome | Column H / Claims and Claims Adjustment Expenses Incurred Related to / Current Year | Column H / Claims and Claims Adjustment Expenses Incurred Related to / Prior Year | Column I / Amortizationof deferredpolicy acquisitioncosts | Column J / Paid Claims and Claims Adjustment Expenses | Column K / Net Premiumswritten |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | 165.2 | 2,127.5 | — | 853.3 | 1,587.8 | 90.7 | 914.4 | (58.6) | 294.1 | 416.7 | 1,679.1 |
| 2023 | 145.3 | 1,605.1 | — | 743.6 | 1,409.7 | 61.4 | 706.9 | 19.9 | 273.1 | 407.9 | 1,520.9 |
| Bamboo Captive (1) | |||||||||||
| 2025 | — | — | — | — | $26.7 | $1.8 | $16.0 | $2.0 | $9.7 | $27.2 | $16.1 |
| 2024 | 10.2 | 17.8 | — | 31.5 | 39.4 | 1.4 | 17.3 | 3.3 | 14.1 | 12.0 | 50.0 |
| 2023 | — | — | — | — | — | — | — | — | — | — | — |
| Bamboo CRVs | |||||||||||
| 2025 | $2.5 | $13.6 | — | $9.6 | $22.2 | $1.5 | $16.2 | $3.8 | $8.3 | $16.4 | $1.4 |
Item 16. Form 10-K Summary.
FAQ
- What is White Mountains Insurance Group's bamboo captive — prior year?
- White Mountains Insurance Group (WTM) reported bamboo captive — prior year of $500K in Q4 2025.
- How has White Mountains Insurance Group's bamboo captive — prior year changed year-over-year?
- White Mountains Insurance Group's bamboo captive — prior year decreased by 39.4% year-over-year, from $825K to $500K.
- What does bamboo captive — prior year mean?
- The development of claims and losses related to policies written in previous fiscal years. This metric is used to evaluate the adequacy of prior-period loss reserves and the accuracy of historical underwriting estimates.
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