White Mountains Insurance Group WTM Specialty — Prior Year

Other product segments

Similar metrics at other companies

ACGLSpecialty lines — Prior years

-$63M-80.0%

ORISpecialty Insurance — Prior Year Claims and Claims Adjustment Expense

$20.1M-50.4%

THGSpecialty Lines — Prior Year Favorable Catastrophe Development

-$5.8M-132%

AIZFinancial Service — Prior years

-$400K+83.8%

ORISpecialty Insurance — Claims and claim adjustment expenses attributable to insured events of prior years

$610.9M+19.6%

THGSpecialty Lines — Prior Year Claims Adjustment Expense Excluding Catastrophes

-$14.2M+10.7%

Questions, answered.

What is White Mountains Insurance Group's specialty — prior year?

White Mountains Insurance Group (WTM) reported specialty — prior year of -$6.8M in Q4 2025.

How has White Mountains Insurance Group's specialty — prior year changed year-over-year?

White Mountains Insurance Group's specialty — prior year decreased by 179.3% year-over-year, from $8.58M to -$6.8M.

What is the long-term trend for White Mountains Insurance Group's specialty — prior year?

Over 4 years (2021 to 2025), White Mountains Insurance Group's specialty — prior year has grown at a 69.4% compound annual growth rate (CAGR), from $3.3M to -$27.2M.

What does specialty — prior year mean?

This metric represents the net favorable or unfavorable development of loss reserves established in prior reporting periods for the Specialty insurance segment. It reflects the accuracy of initial actuarial estimates and the impact of subsequent claims experience on the company's historical underwriting results.