What is White Mountains Insurance Group's specialty — 6?

White Mountains Insurance Group (WTM) reported specialty — 6 of 2.5% in Q4 2025.

How has White Mountains Insurance Group's specialty — 6 changed year-over-year?

White Mountains Insurance Group's specialty — 6 decreased by 0.0% year-over-year, from 2.5% to 2.5%.

What does specialty — 6 mean?

Quantifies the net reserve development for the specialty segment, capturing the variance between actual claim settlements and previous reserve estimates for prior periods. It is a critical measure of the segment's underwriting risk profile and historical claim experience.

White Mountains Insurance Group WTM Specialty — 6

Other product segments

Casualty-Active

11.2%-4.3%

Casualty-Runoff

6.7%-1.5%

Marine & Energy

6.5%-5.8%

Property and Accident & Health

1.9%+46.2%

Similar metrics at other companies

ACGLSpecialty — Total of IBNR liabilities plus expected development on reported claims

127,500,000,000%+20,500,000,000pp

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

-$20M-8.7%

ACGLSpecialty — Incurred losses and allocated loss adjustment expenses, net of reinsurance

856,400,000,000%+686,800,000,000pp

ORISpecialty Insurance Segment — Risk based capital

508%-41.0pp

CNASpecialty — Net Case Reserves

$1.8B+6.1%

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

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

Other financials

Income statement

See full

Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

See full

Total debt$834.8M+23.5%

Total equity$5.4B+19.2%

Total assets$13.2B+19.7%

Cash flow

See full

Operating cash flow$30.5M+176%

Valuation

See full

Market cap$4.99B+9.8%

Profitability

See full

Gross margin94.9%-3.7pp

Net margin28.4%—

Returns & leverage

See full

Return on equity21.2%—

Debt / equity0.2×0.0×

Where this comes from

Reported directly by White Mountains Insurance Group in its filing.

Tagged under the XBRL concept us-gaap:ShortdurationInsuranceContractsHistoricalClaimsDurationYearSix.

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 specialty — 6?: White Mountains Insurance Group (WTM) reported specialty — 6 of 2.5% in Q4 2025.
How has White Mountains Insurance Group's specialty — 6 changed year-over-year?: White Mountains Insurance Group's specialty — 6 decreased by 0.0% year-over-year, from 2.5% to 2.5%.
What does specialty — 6 mean?: Quantifies the net reserve development for the specialty segment, capturing the variance between actual claim settlements and previous reserve estimates for prior periods. It is a critical measure of the segment's underwriting risk profile and historical claim experience.