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🛡️ '''Excess-of-loss reinsurance (XoL)''' is a form of [[Definition:Non-proportional reinsurance | non-proportional reinsurance]] in which the [[Definition:Reinsurer | reinsurer]] agrees to indemnify the [[Definition:Ceding company | ceding company]] for losses that exceed a specified threshold, known as the [[Definition:Retention | retention]] or attachment point, up to a defined upper limit. Unlike [[Definition:Proportional reinsurance | proportional reinsurance]], where premiums and losses are shared by a fixed percentage, XoL contracts transfer only the portion of loss that pierces a predetermined layer. This structure is widely used across global insurance and reinsurance markets — from [[Definition:Lloyd's of London | Lloyd's]] syndicates to large composite insurers in Continental Europe, Asia, and North America — to protect against severity risk on individual claims or accumulations of losses from a single event.

⚙️ XoL programs are typically structured in layers, each with its own attachment point and limit. A primary insurer might retain the first portion of any loss (say, the first $5 million), then purchase a first-layer XoL cover responding from $5 million to $15 million, with a second layer from $15 million to $50 million placed with different reinsurers. [[Definition:Reinstatement | Reinstatement]] provisions dictate whether and at what cost cover is restored after a loss erodes the limit. There are several subtypes: per-risk XoL protects against large individual claims, per-occurrence or per-event XoL (often called [[Definition:Catastrophe excess-of-loss reinsurance | catastrophe XoL]]) responds to aggregate losses from a single event such as a hurricane or earthquake, and [[Definition:Aggregate excess-of-loss reinsurance | aggregate XoL]] caps the cedent's total losses over a policy period. Pricing relies heavily on [[Definition:Catastrophe model | catastrophe models]], historical [[Definition:Loss experience | loss experience]], and [[Definition:Exposure rating | exposure rating]] techniques, with the [[Definition:Reinsurance premium | premium]] reflecting the probability that losses will penetrate the layer.

📊 For cedents, XoL reinsurance is an essential tool for managing [[Definition:Peak risk | peak exposures]] and stabilizing earnings against outsized losses that would otherwise distort financial results. Regulators in [[Definition:Solvency II | Solvency II]] jurisdictions, the U.S. [[Definition:Risk-based capital (RBC) | risk-based capital]] framework, and China's [[Definition:China Risk Oriented Solvency System (C-ROSS) | C-ROSS]] regime all recognize the capital relief that well-structured XoL programs provide, though the credit given varies by market and depends on factors such as [[Definition:Collateral | collateral]] arrangements and the reinsurer's credit quality. The structure also shapes the competitive dynamics of the global [[Definition:Reinsurance market | reinsurance market]]: capacity for upper layers of catastrophe XoL programs often concentrates among a handful of large reinsurers and [[Definition:Insurance-linked securities (ILS) | ILS]] funds, making placement strategy a critical part of any insurer's [[Definition:Reinsurance program | reinsurance program]] design.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Proportional reinsurance]]
* [[Definition:Catastrophe excess-of-loss reinsurance]]
* [[Definition:Retention]]
* [[Definition:Reinstatement]]
* [[Definition:Aggregate excess-of-loss reinsurance]]
* [[Definition:Reinsurance program]]
{{Div col end}}

Definition:Excess-of-loss reinsurance (XoL) - Revision history

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