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🛡️ '''Aggregate excess-of-loss reinsurance''' is a form of [[Definition:Non-proportional reinsurance | non-proportional reinsurance]] that protects a [[Definition:Cedent | ceding insurer]] against the cumulative total of [[Definition:Retained loss | retained losses]] exceeding a specified threshold over a defined period, rather than against any single large event. Where a traditional [[Definition:Per-occurrence excess-of-loss reinsurance | per-occurrence excess-of-loss]] treaty responds to individual catastrophic events, aggregate excess-of-loss coverage triggers when the sum of all qualifying losses — each potentially modest on its own — breaches an annual aggregate [[Definition:Retention | retention]] point. This makes it particularly valuable for protecting against "loss creep" years in which frequency, rather than severity, drives poor results.

📐 The structure is built around two key parameters: the aggregate [[Definition:Attachment point | attachment point]] (the total retained loss amount that must be reached before recoveries begin) and the [[Definition:Reinsurance limit | limit]] (the maximum the [[Definition:Reinsurer | reinsurer]] will reimburse above that attachment). The attachment point is often expressed as a [[Definition:Loss ratio | loss ratio]] — for example, the treaty might activate once the cedent's annual loss ratio on a particular [[Definition:Line of business | line of business]] exceeds 75%, and respond up to an additional 20 points. [[Definition:Premium | Premiums]] for aggregate excess-of-loss treaties are calculated using sophisticated [[Definition:Actuarial science | actuarial models]] that simulate the probability distribution of aggregate losses, accounting for correlation among individual risks and [[Definition:Trend factor | trend factors]]. Some treaties include an [[Definition:Annual aggregate deductible | annual aggregate deductible]] or co-participation percentage to align incentives and prevent moral hazard.

💡 Carriers value aggregate excess-of-loss reinsurance as a tool for [[Definition:Earnings volatility | earnings stabilization]] and [[Definition:Capital management | capital efficiency]]. By capping the total annual loss outcome, the cedent can project more predictable bottom-line results and potentially reduce the [[Definition:Risk-based capital (RBC) | risk-based capital]] it must hold. This is especially relevant for insurers writing [[Definition:Long-tail line | long-tail lines]] or operating in [[Definition:Catastrophe-exposed | catastrophe-exposed]] territories where a bad year can be driven by dozens of moderate events rather than one headline disaster. [[Definition:Rating agency | Rating agencies]] and regulators view well-structured aggregate covers favorably, as they demonstrate disciplined [[Definition:Risk management | risk management]]. In the [[Definition:Reinsurance market | reinsurance market]], demand for these treaties tends to rise after periods of elevated loss frequency, reinforcing their role as a counter-cyclical planning instrument.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aggregate stop-loss]]
* [[Definition:Excess-of-loss reinsurance]]
* [[Definition:Non-proportional reinsurance]]
* [[Definition:Attachment point]]
* [[Definition:Loss ratio]]
* [[Definition:Cedent]]
{{Div col end}}

Definition:Aggregate excess-of-loss reinsurance - Revision history

PlumBot: Bot: Creating new article from JSON