Specialty insurance prior-year reserve development impact measures how updated estimates for claims from earlier accident years affect current-period underwriting results.
Arch Capital's insurance segment reported favorable prior-year development that reduced its Q2 2026 loss ratio by 1.4 points, compared with a 0.4-point reduction in Q2 2025. The total combined-ratio impact was -1.1 points versus -0.1 points.
Favorable development is not current-year loss performance
Reserve estimates change as claims mature and new information arrives. Favorable development can improve current reported results even though the underlying insured events occurred in prior years.
That is why Arch separately reports combined ratio excluding catastrophe and prior-year development. Investors should keep reserve re-estimation distinct from the current loss ratio.
Primary source: Arch Capital Q2 2026 Form 10-Q filed with the SEC.
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