Treaty underwriter
The professional who analyzes a ceding portfolio, sets its price and commits the reinsurer's capacity.
Textbook case: a cedant's combined ratio improves from 104 to 97%, and the triangles trace the gap to a 14 million euro reserve release on prior years rather than to the current year's underwriting. A treaty underwriter assesses a cedant's portfolio as a whole, not risk by risk as in facultative: composition, underwriting guidelines, adjusted loss history, reserving quality, governance. From that the underwriter derives a price, an acceptable structure and a share, then commits the company's capacity for a year. The job is underwriting blind. A treaty underwriter has seen none of the policies being reinsured and never will; what they actually write is an organization and a discipline, and the numbers are only its trace. So the relationship matters as much as the model, and an underwriter follows a cedant for years to tell a bad year from a drift. The toolkit is experience rating, exposure rating, cat models and reserve variance analysis. The standing trade-off sets the technical price they compute against the price the market will bear.
An underwriter reviews a cedant in 2026 whose reported combined ratio improves from 104 to 97 percent. The settlement triangles show the improvement comes from a 14 million euro release of prior-year reserves, not from current underwriting, whose ratio has actually deteriorated by 3 points. The underwriter keeps a 9 percent share but insists on a loss corridor and turns down the requested rate cut.
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