What is White Mountains Insurance Group's specialty — 9?

White Mountains Insurance Group (WTM) reported specialty — 9 of 1.2% in Q4 2025.

How has White Mountains Insurance Group's specialty — 9 changed year-over-year?

White Mountains Insurance Group's specialty — 9 decreased by 7.7% year-over-year, from 1.3% to 1.2%.

What does specialty — 9 mean?

Tracks the net development of prior year claims for the specialty segment, providing a view into the historical accuracy of loss reserves. Consistent monitoring of this metric is vital for understanding the segment's overall underwriting profitability and risk management effectiveness.

White Mountains Insurance Group WTM Specialty — 9

Other product segments

Casualty-Active

4.2%+13.5%

Casualty-Runoff

3.2%+3.2%

Property and Accident & Health

0.2%+100%

Marine & Energy

0.1%-66.7%

Similar metrics at other companies

ACGLSpecialty — Year Nine

0%—

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

CNASpecialty — Policyholder Benefits and Claims Incurred, Net

$586M+15.1%

RDNSpecialty Insurance — Policyholder Benefits And Claims Incurred Net

$86.27M—

CNASpecialty — Other

$0—

Other financials

Income statement

See full

Revenue$517.8M-10.4%

Gross profit$475.1M-16.7%

Net income-$27.2M-180%

Balance sheet

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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:ShortdurationInsuranceContractsHistoricalClaimsDurationYearNine.

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 — 9?: White Mountains Insurance Group (WTM) reported specialty — 9 of 1.2% in Q4 2025.
How has White Mountains Insurance Group's specialty — 9 changed year-over-year?: White Mountains Insurance Group's specialty — 9 decreased by 7.7% year-over-year, from 1.3% to 1.2%.
What does specialty — 9 mean?: Tracks the net development of prior year claims for the specialty segment, providing a view into the historical accuracy of loss reserves. Consistent monitoring of this metric is vital for understanding the segment's overall underwriting profitability and risk management effectiveness.