Specialty insurance loss ratio measures losses and loss-adjustment costs relative to earned premium, showing how much of premium is being consumed by insured claims.
Arch Capital's insurance segment reported a 63.0% loss ratio in Q2 2026, up from 59.8% in Q2 2025.
The ratio mixes current claims with volatile items
Arch said Q2 2026 reflected substantial current-year catastrophe activity, while favorable development of prior-year loss reserves reduced the ratio. Those effects can move the headline ratio even when underlying pricing or ordinary claim trends change less.
Pair the loss ratio with catastrophe loss impact and prior-year reserve development impact before attributing the movement to current underwriting alone.
Primary source: Arch Capital Q2 2026 Form 10-Q filed with the SEC.
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Compare claims economics
Compare loss ratios while checking catastrophe and reserve-development effects.
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