White Mountains Insurance Group WTM Property and Accident & Health — 8
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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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearEight.
The official record: White Mountains Insurance Group’s 10-K, filed February 27, 2026, on SEC EDGAR. View the filing →
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Questions, answered.
- What is White Mountains Insurance Group's property and accident & health — 8?
- White Mountains Insurance Group (WTM) reported property and accident & health — 8 of 0.9% in Q4 2025.
- How has White Mountains Insurance Group's property and accident & health — 8 changed year-over-year?
- White Mountains Insurance Group's property and accident & health — 8 increased by 12.5% year-over-year, from 0.8% to 0.9%.
- What does property and accident & health — 8 mean?
- This metric tracks the net development of prior year loss reserves specifically for the Property and Accident & Health business line. It provides transparency into how historical underwriting outcomes are impacting current period earnings. Monitoring this metric helps investors gauge the stability of the segment's loss reserves.