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🌪️ '''Property catastrophe excess of loss''' is a form of [[Definition:Reinsurance | reinsurance]] treaty that protects a [[Definition:Cedent | ceding insurer]] against the accumulation of [[Definition:Property insurance | property]] losses arising from a single catastrophic event — such as a hurricane, earthquake, wildfire, or major flood — once those aggregate losses exceed a specified [[Definition:Retention | retention]] threshold. Unlike [[Definition:Per-risk excess of loss | per-risk excess of loss]] treaties that respond to large individual claims, property catastrophe excess of loss (often abbreviated as property cat XL or simply cat XL) aggregates all losses from one defined [[Definition:Loss occurrence | occurrence]] across the cedent's entire property portfolio, making it the primary tool insurers use to manage peak accumulation risk from natural and man-made catastrophes.

⚙️ A typical property cat XL program is structured in multiple layers, each with its own [[Definition:Attachment point | attachment point]], [[Definition:Limit | limit]], and [[Definition:Reinsurance premium | premium]]. The lowest layer attaches just above the cedent's chosen retention — the amount of catastrophe loss the insurer is prepared to absorb on its own balance sheet — and successive layers provide progressively higher coverage up to an agreed ceiling. [[Definition:Reinsurer | Reinsurers]] and [[Definition:Insurance-linked securities (ILS) | ILS]] investors participate in different layers depending on their risk appetite: lower layers, which attach more frequently, command higher [[Definition:Rate on line (ROL) | rates on line]], while upper layers offer lower expected loss ratios but exposure to truly extreme tail events. The definition of a covered occurrence — including hours clauses that specify the time window within which losses must occur to be aggregated as a single event — is a critical contract term that both parties negotiate carefully. Pricing relies heavily on [[Definition:Catastrophe model | catastrophe models]] developed by vendors such as those in the [[Definition:Risk modeling | risk modeling]] industry, supplemented by the cedent's own loss history and exposure data. At the [[Definition:January 1 renewal | January 1 renewal]] — the dominant placement date for property cat XL treaties globally — cedents, [[Definition:Reinsurance broker | brokers]], and reinsurers converge to negotiate terms that reflect evolving views of catastrophe risk, recent loss activity, and available [[Definition:Reinsurance capacity | capacity]].

📊 Property catastrophe excess of loss reinsurance occupies a central position in the global risk transfer chain because it directly determines how much catastrophe exposure remains on primary insurers' balance sheets versus being distributed across reinsurers, [[Definition:Retrocession | retrocessionaires]], and capital markets participants. Without adequate cat XL protection, a single major hurricane or earthquake could consume years of an insurer's underwriting profit and threaten its [[Definition:Solvency | solvency]]. The market for this coverage is inherently cyclical: after major loss events — such as Hurricane Andrew in 1992, the Tōhoku earthquake and tsunami in 2011, or the North Atlantic hurricane seasons of 2017 — pricing hardens significantly as reinsurers reassess their models and capacity contracts. Conversely, prolonged periods of benign loss activity attract new capital, including from [[Definition:Catastrophe bond | catastrophe bonds]] and [[Definition:Collateralized reinsurance | collateralized reinsurance]] vehicles, compressing pricing. Regulators worldwide recognize the systemic importance of cat XL: frameworks like [[Definition:Solvency II | Solvency II]], the [[Definition:Risk-based capital (RBC) | RBC]] system, and [[Definition:C-ROSS | C-ROSS]] all grant explicit capital relief for catastrophe reinsurance purchased, reinforcing the treaty's role as a cornerstone of prudent insurance capital management.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Catastrophe model]]
* [[Definition:Attachment point]]
* [[Definition:Rate on line (ROL)]]
* [[Definition:Insurance-linked securities (ILS)]]
* [[Definition:Retrocession]]
{{Div col end}}

Definition:Property catastrophe excess of loss - Revision history

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