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🔗 '''Claim aggregation clause''' is a contractual provision found in [[Definition:Insurance | insurance]] and [[Definition:Reinsurance | reinsurance]] agreements that allows multiple individual [[Definition:Claim | claims]] arising from a single originating cause, event, or set of related circumstances to be treated as one combined loss for the purposes of applying [[Definition:Deductible | deductibles]], [[Definition:Retention | retentions]], and [[Definition:Limit of liability | policy limits]]. By grouping related claims together, the clause determines how losses stack against the policy structure — an issue that can shift millions of dollars between the insured, the [[Definition:Insurance carrier | insurer]], and the [[Definition:Reinsurer | reinsurer]] depending on whether claims are treated individually or in aggregate.

⚙️ The mechanics hinge on the definition of what constitutes a single "event," "occurrence," or "originating cause" — language that varies significantly across policy wordings and jurisdictions. In [[Definition:Professional liability insurance | professional indemnity]] policies common in the [[Definition:Lloyd's of London | Lloyd's]] market, aggregation language might reference claims "arising from similar acts or omissions in a series of related transactions." In [[Definition:Reinsurance | reinsurance]] treaties, particularly [[Definition:Excess of loss reinsurance | excess-of-loss]] contracts, the aggregation clause determines whether a cluster of ground-up losses from a single [[Definition:Catastrophe loss | catastrophe]] or systemic event breaches the treaty attachment point as one occurrence. Courts in multiple jurisdictions — including landmark rulings in the UK, the U.S., and Australia — have grappled with how broadly or narrowly to interpret aggregation wording, and the outcomes have often turned on subtle differences in contractual language. The interplay between aggregation clauses and [[Definition:Hours clause | hours clauses]] in catastrophe covers adds further complexity.

💡 For insureds, the aggregation clause can be either advantageous or disadvantageous depending on the circumstances. Aggregating multiple small claims into a single loss may allow the combined amount to exceed a per-occurrence deductible and trigger coverage — beneficial when individual claims would each fall below the threshold. Conversely, aggregation can cap the total recovery at a single [[Definition:Limit of liability | per-occurrence limit]] rather than allowing each claim to access its own limit, potentially leaving the insured undercompensated in a mass-loss scenario. For [[Definition:Reinsurer | reinsurers]], aggregation language directly affects how losses are presented under [[Definition:Treaty reinsurance | treaties]], making it a heavily negotiated element at renewal. Disputes over aggregation have produced some of the most significant insurance litigation globally, underscoring why precise drafting and careful review of these clauses remain central to [[Definition:Policy wording | policy wording]] practice.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Occurrence]]
* [[Definition:Hours clause]]
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Retention]]
* [[Definition:Limit of liability]]
* [[Definition:Originating cause]]
{{Div col end}}

Definition:Claim aggregation clause - Revision history

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