Definition:Per-occurrence excess of loss reinsurance
📋 Per-occurrence excess of loss reinsurance is a reinsurance contract structure in which the reinsurer indemnifies the ceding company for losses arising from a single covered event — such as a hurricane, earthquake, or industrial explosion — that exceed a predetermined retention threshold. This form of excess of loss reinsurance sits at the heart of catastrophe reinsurance programs and is one of the most widely purchased protections by primary carriers seeking to cap their exposure to large individual events.
⚙️ Under the contract, the cedent retains all losses from an occurrence up to the agreed attachment point — its net retention. Losses above that level, up to a specified limit, are borne by the reinsurer. For example, a property insurer might retain the first $50 million of loss per hurricane and cede the next $200 million to a per-occurrence excess of loss treaty. The critical operational challenge lies in defining what constitutes a single "occurrence," since the hours clause and event-definition wording determine how individual claims are aggregated. Disputes over occurrence definition — particularly in complex scenarios like multi-day storms or sequential earthquakes — remain a recurring source of reinsurance dispute.
💡 Without per-occurrence excess of loss protection, many insurers would struggle to write meaningful property or casualty books in catastrophe-exposed regions. The structure allows cedents to model their maximum retained loss with relative precision, which in turn supports their capital adequacy calculations and rating agency assessments. The pricing of these layers is heavily influenced by catastrophe models, historical loss experience, and prevailing market conditions. As climate-related volatility intensifies, demand for this coverage continues to grow, and the layers closest to expected loss — the lower attachment points — command the highest rates on line.
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