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🛑 '''Aggregate stop loss''' is a [[Definition:Reinsurance | reinsurance]] or risk-transfer mechanism that caps the total amount of losses an insurer — or, in [[Definition:Self-insurance | self-insured]] and [[Definition:Group health insurance | group health]] contexts, an employer — must bear over a defined period, typically one policy year. Once cumulative losses across a specified portfolio or line of business breach the agreed aggregate threshold, the stop-loss contract responds, with the [[Definition:Reinsurer | reinsurer]] or stop-loss carrier reimbursing some or all losses above that point, up to the contract's own limit. The concept sits at the intersection of [[Definition:Excess of loss reinsurance | excess-of-loss reinsurance]] and aggregate protection, serving as a financial ceiling rather than a per-occurrence trigger.

⚙️ Structurally, an aggregate stop loss is defined by its [[Definition:Attachment point | attachment point]] (the aggregate dollar threshold at which coverage activates), its limit (the maximum the stop-loss carrier will pay), and the subject portfolio it protects. In a [[Definition:Treaty reinsurance | treaty reinsurance]] context, for example, a primary insurer writing [[Definition:Property insurance | property]] business might purchase an aggregate stop-loss cover that attaches when total net incurred losses for the year exceed 75% of [[Definition:Net earned premium | net earned premium]], paying up to an additional 20 percentage points of loss ratio. In the [[Definition:Employee benefits | employee benefits]] arena — especially in the U.S. self-funded health plan market — aggregate stop loss activates when total plan claims exceed a predetermined corridor above expected claims, shielding the employer from an unusually expensive year. The pricing of these contracts demands careful [[Definition:Actuarial analysis | actuarial modeling]] of [[Definition:Loss distribution | loss distributions]], [[Definition:Loss correlation | correlation]] among perils, and [[Definition:Loss trend | trend]] assumptions, because the cover responds to the tail of aggregate outcomes rather than individual large losses.

📈 Aggregate stop-loss protection plays a vital role in stabilizing [[Definition:Underwriting result | underwriting results]] and preserving [[Definition:Solvency | solvency]] margins. Without it, a primary insurer could face a year in which numerous moderate-sized losses — none individually catastrophic — compound into a devastating aggregate result. This is especially relevant in volatile lines such as [[Definition:Catastrophe insurance | catastrophe]], [[Definition:Crop insurance | crop]], or [[Definition:Health insurance | health]], where systemic drivers like weather events or pandemic-related utilization spikes can inflate total losses across an entire book simultaneously. Regulators and [[Definition:Credit rating agency | rating agencies]] view aggregate stop-loss programs favorably as evidence of prudent risk management, and insurers frequently use them alongside [[Definition:Per-occurrence excess of loss | per-occurrence excess-of-loss]] treaties to construct a layered, comprehensive [[Definition:Reinsurance program | reinsurance program]] that addresses both frequency and severity risk.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Excess of loss reinsurance]]
* [[Definition:Attachment point]]
* [[Definition:Specific stop loss]]
* [[Definition:Annual aggregate limit (AAL)]]
* [[Definition:Reinsurance program]]
* [[Definition:Loss ratio]]
{{Div col end}}

Definition:Aggregate stop loss - Revision history

PlumBot: Bot: Creating new article from JSON