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📊 '''Loss aggregation''' is the process of combining individual [[Definition:Loss (insurance) | losses]] from multiple events, [[Definition:Insurance policy | policies]], or [[Definition:Line of business | lines of business]] into a single consolidated figure for purposes of [[Definition:Reinsurance | reinsurance]] recovery, [[Definition:Risk management | risk management]] analysis, or regulatory reporting. In the insurance industry, how losses are grouped can dramatically alter the financial picture: a series of small, independent claims may fall entirely within an insurer's [[Definition:Retention | retention]], but when those same claims are recognized as stemming from a common cause or event and aggregated together, they may breach an [[Definition:Aggregate excess of loss | aggregate excess of loss]] reinsurance attachment point, unlocking significant recoveries.

🔗 The mechanics hinge on clearly defined aggregation clauses within [[Definition:Reinsurance treaty | reinsurance contracts]] and policy wordings. These clauses specify the criteria—such as a shared cause, a defined time window, or a geographic perimeter—under which separate occurrences can be treated as a single [[Definition:Loss event | loss event]]. For example, after a major [[Definition:Catastrophe | catastrophe]] like a hurricane, a [[Definition:Property insurance | property insurer]] aggregates thousands of individual claims arising from the storm to present a unified loss to its [[Definition:Catastrophe excess of loss | catastrophe excess of loss]] reinsurer. Disputes over aggregation language are common and can involve substantial sums, making precise contract drafting and thorough [[Definition:Claims management | claims documentation]] critical.

⚠️ Getting aggregation right carries profound financial consequences. Underestimating the degree to which losses connect to a common event can leave an insurer bearing costs that a reinsurer should share, while over-aggregating may trigger [[Definition:Reinsurance | reinsurance]] disputes or exhaust [[Definition:Policy limit | policy limits]] prematurely. [[Definition:Actuarial analysis | Actuarial]] and [[Definition:Exposure management | exposure management]] teams use aggregation modeling extensively to stress-test portfolios against [[Definition:Catastrophe model | catastrophe scenarios]] and [[Definition:Clash cover | clash events]]. Regulators and [[Definition:Rating agency | rating agencies]] also examine an insurer's aggregation methodology to assess whether reported reserves and capital adequacy reflect the true concentration of risk.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Aggregate excess of loss]]
* [[Definition:Loss event]]
* [[Definition:Catastrophe excess of loss]]
* [[Definition:Hours clause]]
* [[Definition:Clash cover]]
* [[Definition:Occurrence]]
{{Div col end}}

Definition:Loss aggregation - Revision history

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