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🔒 '''Stop-loss reinsurance''' is a form of [[Definition:Reinsurance | reinsurance]] that protects a [[Definition:Ceding company | ceding insurer]] against aggregate losses exceeding a specified threshold — typically expressed as a [[Definition:Loss ratio (L/R) | loss ratio]] percentage — over a defined period, usually one policy year. Rather than attaching to individual claims or specific [[Definition:Catastrophe loss | catastrophe events]], this treaty responds when the insurer's overall loss experience deteriorates beyond an agreed-upon level. It functions as a financial backstop for an insurer's entire book of business or a particular line, absorbing the impact of an accumulation of adverse outcomes that might individually fall below [[Definition:Excess-of-loss reinsurance | excess-of-loss]] triggers but collectively strain the insurer's [[Definition:Underwriting result | underwriting results]].

📐 Under a typical arrangement, the [[Definition:Reinsurance treaty | treaty]] specifies an attachment point — for instance, an 80% loss ratio — and a limit or cap on the [[Definition:Reinsurer | reinsurer's]] liability, perhaps covering losses up to a 120% loss ratio. If the ceding company's actual loss ratio for the covered [[Definition:Line of business | line of business]] comes in at 95%, the reinsurer would cover losses corresponding to the 15 percentage points between the 80% attachment and the 95% actual result. The [[Definition:Reinsurance premium | premium]] is determined during negotiation and reflects the [[Definition:Reinsurer | reinsurer's]] assessment of the ceding company's [[Definition:Underwriting | underwriting]] quality, historical volatility, mix of business, and prevailing [[Definition:Reinsurance market | market conditions]]. Because the coverage is broad and aggregate in nature, [[Definition:Actuarial analysis | actuarial analysis]] and sophisticated [[Definition:Stochastic modeling | stochastic modeling]] are critical to pricing these treaties appropriately.

🧩 The strategic importance of stop-loss reinsurance becomes clearest during volatile periods — when a string of mid-sized losses, an uptick in [[Definition:Claims frequency | claims frequency]], or deteriorating [[Definition:Loss development | loss development]] trends conspire to push a book's performance beyond acceptable bounds. For smaller or specialty [[Definition:Insurance carrier | insurers]] with concentrated portfolios, this form of protection can be the difference between a manageable bad year and a threat to [[Definition:Solvency | solvency]]. It also plays a role in [[Definition:Capital management | capital management]], as regulators and [[Definition:Rating agency | rating agencies]] may grant credit for aggregate reinsurance when evaluating an insurer's risk profile. However, because it covers broad portfolio deterioration rather than discrete events, stop-loss reinsurance can carry moral hazard concerns, and reinsurers often include provisions requiring the ceding company to retain meaningful "skin in the game" above the attachment.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Excess-of-loss reinsurance]]
* [[Definition:Aggregate excess-of-loss reinsurance]]
* [[Definition:Quota share reinsurance]]
* [[Definition:Loss ratio (L/R)]]
* [[Definition:Reinsurance treaty]]
* [[Definition:Ceding company]]
{{Div col end}}

Definition:Stop-loss reinsurance - Revision history

PlumBot: Bot: Creating new article from JSON