Definition:Per-occurrence excess-of-loss reinsurance
📋 Per-occurrence excess-of-loss reinsurance is a non-proportional reinsurance arrangement where the reinsurer responds to losses from a single event that breach the ceding insurer's stated retention. It is functionally synonymous with per-occurrence excess of loss reinsurance — the hyphenated and unhyphenated forms appear interchangeably across reinsurance contracts, market reports, and regulatory filings. Whether written as "excess of loss" or "excess-of-loss," the economic substance is identical: protection against severity from discrete occurrences.
⚙️ Mechanically, the ceding company defines an attachment point and a coverage limit for each occurrence. When a qualifying event — a wildfire, a major liability verdict, a single marine loss — produces net claims exceeding the attachment point, the reinsurer pays the excess up to the agreed ceiling. Layering is standard practice: a large insurer might structure its program with multiple excess-of-loss layers, each placed with different reinsurers or Lloyd's syndicates, so that progressively more remote loss scenarios are covered by successive tiers. The reinstatement provisions dictate whether and at what additional premium the coverage resets after a loss recovery.
💡 This structure is foundational to how the global reinsurance market distributes peak-peril risk. Cedents rely on it to stabilize earnings volatility and satisfy solvency requirements, while reinsurers use it to deploy capital efficiently against well-defined loss triggers. Brokers such as those operating in the London market spend considerable effort negotiating occurrence definitions, reinstatement terms, and exclusion language — details that determine whether a borderline event triggers one or two recoveries. In an era of rising natural catastrophe frequency, the precision of these contracts directly shapes the financial resilience of the entire insurance value chain.
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