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🛡️ '''Catastrophe excess of loss (cat XoL)''' is a form of [[Definition:Reinsurance | reinsurance]] treaty under which a [[Definition:Reinsurer | reinsurer]] indemnifies a [[Definition:Ceding company | ceding company]] for the portion of aggregate catastrophe losses from a single event that exceeds a specified [[Definition:Retention | retention]] (the attachment point) up to a defined limit. It is the workhorse of the property catastrophe reinsurance market, enabling primary insurers and regional carriers to cap their exposure to large-scale natural disasters — hurricanes, earthquakes, typhoons, and floods — without ceding day-to-day attritional losses. The contract responds on a per-occurrence basis, meaning the trigger is a single defined catastrophe event rather than the accumulation of many unrelated claims.

⚙️ A cat XoL program is typically structured in multiple [[Definition:Catastrophe layer | layers]], each sitting above the last. The lowest layer attaches just above the cedant's chosen retention and covers losses up to a fixed ceiling; subsequent layers pick up where the prior one exhausts, extending protection further into the tail. Pricing for each layer reflects its probability of attachment — lower, more exposed layers carry higher [[Definition:Rate on line (RoL) | rates on line]] than remote upper layers. Placement often involves multiple reinsurers sharing each layer, coordinated by a [[Definition:Reinsurance broker | reinsurance broker]]. Contracts commonly include [[Definition:Reinstatement | reinstatement]] provisions, which allow the cedant to restore coverage after a loss in exchange for additional [[Definition:Reinstatement premium | reinstatement premium]], ensuring protection remains in place for subsequent events during the treaty period. The program design reflects the cedant's [[Definition:Risk appetite | risk appetite]], regulatory capital requirements — whether under [[Definition:Solvency II | Solvency II]], the [[Definition:Risk-based capital (RBC) | RBC]] framework, [[Definition:C-ROSS | C-ROSS]], or other local regimes — and the capacity available in the reinsurance market.

💡 Cat XoL reinsurance has shaped the financial resilience of the global insurance industry for decades. Without it, many primary insurers — especially those concentrated in catastrophe-prone regions like the Gulf Coast of the United States, the Caribbean, Japan, or Southeast Asia — would lack the capital to survive a severe loss year. The cat XoL market's pricing cycles also serve as a barometer for broader sentiment about [[Definition:Catastrophe risk | catastrophe risk]]: hardening rates after major loss events signal tightened capacity and heightened caution, while soft markets reflect abundant capital and competitive pressure. The growing role of [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]] and [[Definition:Catastrophe bond | catastrophe bonds]] has introduced alternative capital alongside traditional reinsurers, expanding capacity in the upper layers and influencing how cedants structure and place their cat XoL towers.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe layer]]
* [[Definition:Reinsurance]]
* [[Definition:Rate on line (RoL)]]
* [[Definition:Reinstatement]]
* [[Definition:Catastrophe bond]]
* [[Definition:Retention]]
{{Div col end}}

Definition:Catastrophe excess of loss (cat XoL) - Revision history

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