White Mountains Insurance Group WTM Property and Accident & Health — 9
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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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine.
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 — 9?
- White Mountains Insurance Group (WTM) reported property and accident & health — 9 of 0.2% in Q4 2025.
- How has White Mountains Insurance Group's property and accident & health — 9 changed year-over-year?
- White Mountains Insurance Group's property and accident & health — 9 increased by 100.0% year-over-year, from 0.1% to 0.2%.
- What does property and accident & health — 9 mean?
- This metric measures the net impact of prior year reserve development for the Property and Accident & Health segment. It reflects the financial adjustment required to align historical loss estimates with current claims experience. This metric is a primary indicator of the segment's actuarial accuracy and historical underwriting performance.