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📊 '''Excess of loss (XoL)''' is a [[Definition:Reinsurance | reinsurance]] arrangement in which the [[Definition:Reinsurer | reinsurer]] indemnifies the [[Definition:Ceding company | ceding company]] for losses that exceed a specified [[Definition:Retention | retention]] (also called the attachment point or priority), up to a defined [[Definition:Policy limit | limit]]. Unlike [[Definition:Quota share | quota share]] or other [[Definition:Proportional reinsurance | proportional reinsurance]] structures where premiums and losses are shared from the first dollar on a fixed percentage basis, XoL is a [[Definition:Non-proportional reinsurance | non-proportional]] form of reinsurance that activates only when individual losses or aggregated losses breach a predetermined threshold. It is one of the most widely used reinsurance structures globally, employed by [[Definition:Primary insurer | primary insurers]] of all sizes to protect against catastrophic or unexpectedly severe loss events.

⚙️ XoL reinsurance comes in several principal forms. Per-risk excess of loss covers individual losses on a single risk that pierce the retention — common in [[Definition:Property insurance | property]] and [[Definition:Marine insurance | marine]] lines. Per-occurrence or catastrophe excess of loss (often called "cat XoL") responds when a single event, such as a hurricane or earthquake, generates aggregate losses across multiple policies that exceed the retention. [[Definition:Aggregate excess of loss | Aggregate excess of loss]] (or stop loss) triggers when cumulative losses over a defined period surpass a stated amount or [[Definition:Loss ratio | loss ratio]] threshold. Pricing for XoL treaties is typically modeled using actuarial techniques such as [[Definition:Exposure rating | exposure rating]], [[Definition:Experience rating | experience rating]], and increasingly sophisticated [[Definition:Catastrophe model | catastrophe models]] from vendors like AIR, RMS, and CoreLogic. The ceding company pays a [[Definition:Reinsurance premium | reinsurance premium]] that reflects the probability and severity of losses penetrating the layer, with pricing influenced by historical loss experience, modeled expected losses, and prevailing [[Definition:Reinsurance market | market conditions]].

🌍 XoL reinsurance is central to how the global insurance industry manages peak exposures and maintains solvency in the face of large-scale loss events. Without it, many primary insurers would lack the capital to underwrite concentrated catastrophe risks in regions like the U.S. Gulf Coast, the Caribbean, Japan, or Southeast Asia. The structure also plays a critical role in [[Definition:Capital management | capital management]]: under [[Definition:Solvency II | Solvency II]], [[Definition:Risk-based capital (RBC) | risk-based capital]] frameworks in the United States, and [[Definition:C-ROSS | C-ROSS]] in China, purchasing XoL cover directly reduces an insurer's required capital by transferring tail risk to reinsurers. The annual January 1 renewal season, when a large share of global XoL treaties are renegotiated, is a bellwether for reinsurance pricing trends and capacity availability, watched closely by industry participants, rating agencies, and investors in [[Definition:Insurance-linked securities (ILS) | insurance-linked securities]].

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Reinsurance]]
* [[Definition:Non-proportional reinsurance]]
* [[Definition:Retention]]
* [[Definition:Catastrophe reinsurance]]
* [[Definition:Quota share]]
* [[Definition:Aggregate excess of loss]]
{{Div col end}}

Definition:Excess of loss (XoL) - Revision history

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