White Mountains Insurance Group WTM Property and Accident & Health — 2

Other product segments

Similar metrics at other companies

HIGProperty, Liability and Casualty Insurance Product Line — Prior accident year development [1]

-$41M+66.4%

HIGProperty & Casualty Other Operations — Prior accident year development [1]

-$36M—

ALLProperty and casualty — Prior years

-$1B-300%

RNRProperty — Net claims and claim expenses incurred – prior accident years

-$160.74M+14.1%

CINFProperty and Casualty Insurance — Prior accident years

$967M+20.0%

RNRProperty — Net claims and claim expense ratio – prior accident years

-17.9%+4.3pp

Questions, answered.

What is White Mountains Insurance Group's property and accident & health — 2?

White Mountains Insurance Group (WTM) reported property and accident & health — 2 of 31.9% in Q4 2025.

How has White Mountains Insurance Group's property and accident & health — 2 changed year-over-year?

White Mountains Insurance Group's property and accident & health — 2 decreased by 2.7% year-over-year, from 32.8% to 31.9%.

What does property and accident & health — 2 mean?

This metric represents the net favorable or unfavorable development of prior accident year loss reserves for the Property and Accident & Health segment. It reflects the adjustment in estimated liabilities for claims incurred in previous periods as more information becomes available. Changes in this figure indicate the accuracy of initial underwriting assumptions and reserve adequacy over time.