White Mountains Insurance Group WTM Property and Accident & Health — 6

Other product segments

Similar metrics at other companies

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

-$160.74M+14.1%

FRHCAccident Insurance — 6

0.3%—

ACGLTravel and accident — Prior years

-$10M-25.0%

ALLProperty and casualty — Prior years

-$1B-300%

WRBProperty — Reserves for loss and loss adjustment expenses before 2016, net of reinsurance

$3.64M+84.6%

FRHCAccident Insurance — 5

18.6%—

Questions, answered.

What is White Mountains Insurance Group's property and accident & health — 6?

White Mountains Insurance Group (WTM) reported property and accident & health — 6 of 1.9% in Q4 2025.

How has White Mountains Insurance Group's property and accident & health — 6 changed year-over-year?

White Mountains Insurance Group's property and accident & health — 6 increased by 46.2% year-over-year, from 1.3% to 1.9%.

What does property and accident & health — 6 mean?

This metric represents the net gain or loss resulting from the re-estimation of prior year insurance claims liabilities in the Property and Accident & Health segment. It serves as a measure of reserve volatility and the effectiveness of the company's actuarial processes. Positive developments suggest conservative reserving, while negative developments may indicate emerging loss trends.