What is Arch Capital Group's specialty lines — prior years?

Arch Capital Group (ACGL) reported specialty lines — prior years of -$63M in Q1 2026.

What does specialty lines — prior years mean?

This metric represents the net favorable or unfavorable development of loss reserves established in previous underwriting years for the specialty insurance segment. It reflects the accuracy of initial actuarial estimates regarding claims frequency and severity as those claims mature over time. Positive development indicates that prior reserves were redundant, while negative development suggests that reserves were insufficient to cover actual claim costs.

Arch Capital Group ACGL Specialty lines — Prior years

Other product segments

Property other than property catastrophe

-$72M—

Casualty

$20M+150%

Travel and accident

-$10M-25.0%

Similar metrics at other companies

WTMSpecialty — Prior Year

-$6.8M-179%

PRA

PRASpecialty P&C — Net favorable prior year reserve development

$3.6M+800%

THGSpecialty Lines — Prior Year Favorable Catastrophe Development

-$5.8M-132%

PRA

PRASpecialty P&C — Net unfavorable prior year reserve development

$2.13M—

PRA

PRASpecialty P&C — (Favorable) unfavorable development of reserves established in prior years, net

$3M+300%

THGSpecialty Lines — Prior Year Claims Adjustment Expense Excluding Catastrophes

-$14.2M+10.7%

Other financials

Income statement

See full

Revenue$4.5B-3.3%

Net income$1.0B+82.4%

EPS (diluted)$2.88+94.6%

Balance sheet

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Cash & equivalents$1.8B-10.3%

Total debt$2.4B0.0%

Total equity$24.2B+12.3%

Total assets$81.4B+8.3%

Cash flow

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Operating cash flow$1.2B-18.5%

CapEx$8.0M-11.1%

Free cash flow$1.2B-18.6%

Valuation

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Market cap$33.91B+5.5%

Enterprise value$34.53B+5.2%

P/E7×-1.6×

P/S1.7×0.0×

Profitability

See full

Net margin24.6%+3.9pp

FCF margin29.6%-6.3pp

Returns & leverage

See full

Return on equity21.3%+2.9pp

Debt / equity0.1×0.0×

Where this comes from

Reported directly by Arch Capital Group in its filing.

Tagged under the XBRL concept us-gaap:SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense.

The official record: Arch Capital Group’s 10-Q, filed May 5, 2026, on SEC EDGAR. View the filing →

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Questions, answered.

What is Arch Capital Group's specialty lines — prior years?: Arch Capital Group (ACGL) reported specialty lines — prior years of -$63M in Q1 2026.
What does specialty lines — prior years mean?: This metric represents the net favorable or unfavorable development of loss reserves established in previous underwriting years for the specialty insurance segment. It reflects the accuracy of initial actuarial estimates regarding claims frequency and severity as those claims mature over time. Positive development indicates that prior reserves were redundant, while negative development suggests that reserves were insufficient to cover actual claim costs.