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🔗 '''Clash analysis''' is a risk assessment technique used primarily by [[Definition:Reinsurer | reinsurers]] and large [[Definition:Insurance carrier | insurers]] to evaluate the potential for a single catastrophic event to trigger losses across multiple policies, lines of business, or [[Definition:Cedant | cedants]] simultaneously. In the [[Definition:Reinsurance | reinsurance]] context, a "clash" occurs when one occurrence — such as a major earthquake, industrial explosion, or widespread [[Definition:Cyber insurance | cyber]] attack — generates claims under several seemingly unrelated contracts that all fall within the same reinsurer's portfolio. The analysis aims to quantify these hidden accumulations of exposure so that the reinsurer can price its covers appropriately and avoid concentration risk that would otherwise remain invisible at the individual contract level.

🧮 Conducting a clash analysis typically involves mapping exposures across multiple dimensions: geographic proximity, shared perils, common [[Definition:Insured | insureds]] or corporate groups, and overlapping [[Definition:Line of business | lines of business]]. A single hurricane, for example, might simultaneously trigger [[Definition:Property insurance | property]], [[Definition:Business interruption insurance | business interruption]], [[Definition:Marine insurance | marine cargo]], [[Definition:Workers' compensation insurance | workers' compensation]], and [[Definition:Automobile insurance | motor]] claims — each written under different treaties or [[Definition:Facultative reinsurance | facultative]] certificates but all landing on the same reinsurer's balance sheet. [[Definition:Catastrophe model | Catastrophe models]] from vendors like [[Definition:AIR Worldwide | AIR]], [[Definition:RMS | RMS]], and [[Definition:CoreLogic | CoreLogic]] supply event footprints that analysts overlay onto their accumulated exposure data. In the [[Definition:Lloyd's | Lloyd's]] market, [[Definition:Realistic disaster scenario (RDS) | realistic disaster scenarios]] serve a similar function, requiring [[Definition:Syndicate | syndicates]] to stress-test their portfolios against defined clash events. Regulatory frameworks, including [[Definition:Solvency II | Solvency II's]] internal model requirements and China's [[Definition:C-ROSS | C-ROSS]] regime, expect insurers and reinsurers to demonstrate that they have identified and managed clash exposures as part of their own risk and solvency assessments.

⚠️ Neglecting clash exposure can lead to catastrophic surprises. The September 11, 2001 attacks are a landmark example: losses cascaded across property, aviation, liability, life, and [[Definition:Workers' compensation insurance | workers' compensation]] books in ways that many reinsurers had not anticipated, revealing correlation risks that traditional single-line [[Definition:Underwriting | underwriting]] had overlooked. Since then, clash analysis has become a core discipline in reinsurance portfolio management, and many large reinsurers maintain dedicated accumulation management teams. For [[Definition:Retrocession | retrocessionaires]] — who absorb risk from reinsurers — the stakes are even higher, as their portfolios may aggregate clash exposures from dozens of underlying ceding companies. As emerging perils such as [[Definition:Cyber insurance | cyber]] and [[Definition:Pandemic insurance | pandemic]] risk introduce new forms of systemic correlation, the sophistication demanded of clash analysis continues to grow.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Accumulation risk]]
* [[Definition:Catastrophe model]]
* [[Definition:Realistic disaster scenario (RDS)]]
* [[Definition:Retrocession]]
* [[Definition:Reinsurance]]
* [[Definition:Exposure management]]
{{Div col end}}

Definition:Clash analysis - Revision history

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