White Mountains Insurance Group WTM Specialty — 3

Other product segments

Similar metrics at other companies

CNASpecialty — Catastrophe losses

$0—

ACGLSpecialty — Liabilities for losses and loss adjustment expenses, net of reinsurance

366,900,000,000%+92,000,000,000pp

THGSpecialty Lines — Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense

-$20M-8.7%

RDNSpecialty Insurance — Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense

$13M—

RDNSpecialty Insurance — Liability For Claims And Claims Adjustment Expense

$1.42B—

ACGLSpecialty — Year Three

14.6%+0.4pp

Questions, answered.

What is White Mountains Insurance Group's specialty — 3?

White Mountains Insurance Group (WTM) reported specialty — 3 of 13.2% in Q4 2025.

How has White Mountains Insurance Group's specialty — 3 changed year-over-year?

White Mountains Insurance Group's specialty — 3 increased by 21.1% year-over-year, from 10.9% to 13.2%.

What does specialty — 3 mean?

Measures the cumulative change in estimated ultimate losses for specialty insurance contracts from prior accident years. It serves as a key indicator of long-term underwriting discipline and the adequacy of historical loss provisions.