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🌪️ '''Catastrophe losses''' are the aggregate [[Definition:Claims | claims]] and associated expenses that [[Definition:Insurance carrier | insurers]] and [[Definition:Reinsurance | reinsurers]] incur from large-scale, low-frequency events — natural or man-made — that generate a sudden concentration of insured damage across a wide geographic area or portfolio segment. Natural perils such as hurricanes, earthquakes, floods, and wildfires account for the majority of catastrophe losses globally, but the category also encompasses man-made events like major industrial explosions, acts of terrorism, and large-scale [[Definition:Cyber insurance | cyber]] incidents. The insurance industry typically classifies an event as a catastrophe when aggregate insured losses exceed a defined threshold, which varies by reporting body — the [[Definition:Property Claim Services (PCS) | Property Claim Services]] index in the United States, for instance, uses a different threshold than [[Definition:Swiss Re | Swiss Re]]'s sigma research or [[Definition:Munich Re | Munich Re]]'s NatCatSERVICE.

⚙️ Catastrophe losses propagate through the insurance value chain in a distinctive pattern. Primary insurers absorb losses up to their [[Definition:Retention | retention]] levels, after which [[Definition:Reinsurance | reinsurance]] programs — structured as [[Definition:Excess of loss reinsurance | excess-of-loss]] treaties, [[Definition:Quota share reinsurance | quota shares]], or [[Definition:Industry loss warranty (ILW) | industry loss warranties]] — transfer exposure to reinsurers and ultimately to [[Definition:Capital markets | capital markets]] through instruments like [[Definition:Catastrophe bond | catastrophe bonds]] and [[Definition:Collateralized reinsurance | collateralized reinsurance]]. [[Definition:Catastrophe model | Catastrophe models]] developed by firms such as [[Definition:Moody's RMS | Moody's RMS]], [[Definition:Verisk | Verisk]], and [[Definition:CoreLogic | CoreLogic]] are central to estimating potential losses before events occur and to updating loss estimates rapidly after a disaster strikes. These models simulate thousands of hypothetical events to produce [[Definition:Probable maximum loss (PML) | probable maximum loss]] curves and [[Definition:Aggregate exceedance probability (AEP) | exceedance probability]] metrics that inform [[Definition:Pricing | pricing]], [[Definition:Underwriting | underwriting]] limits, and capital allocation decisions. Post-event, loss estimates evolve over months as claims are reported, adjusted, and litigated — a process known as [[Definition:Loss development | loss development]] — making initial catastrophe loss figures inherently provisional.

📈 The magnitude and frequency of catastrophe losses increasingly drive strategic decisions across the global insurance industry. Years with elevated catastrophe activity — such as the Atlantic hurricane seasons of 2005 and 2017, or the Australian bushfires of 2019–2020 — can erode industry [[Definition:Surplus | surplus]], trigger [[Definition:Hard market | hard market]] cycles, and reshape [[Definition:Reinsurance | reinsurance]] pricing for years afterward. Climate change has intensified scrutiny of catastrophe loss trends, with regulators in Europe under [[Definition:Solvency II | Solvency II]], in the United States through [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] climate risk disclosures, and in Asia-Pacific markets increasingly requiring insurers to stress-test portfolios against worsening peril scenarios. For investors in [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]], catastrophe losses are the defining risk variable, directly determining whether principal is returned or trapped. Managing catastrophe loss exposure — through geographic diversification, prudent [[Definition:Accumulation management | accumulation management]], and dynamic reinsurance purchasing — remains one of the most consequential disciplines in the property and casualty insurance business.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe model]]
* [[Definition:Catastrophe bond]]
* [[Definition:Reinsurance]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Insurance-linked securities (ILS)]]
{{Div col end}}

Definition:Catastrophe losses - Revision history

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