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⚠️ '''Reserve risk''' is the risk that an insurer's established [[Definition:Loss reserve | loss reserves]] will prove insufficient to cover the actual cost of settling claims that have already occurred. It sits at the heart of insurance [[Definition:Enterprise risk management (ERM) | enterprise risk management]] because, unlike [[Definition:Underwriting risk | underwriting risk]] — which relates to future policy periods — reserve risk deals with obligations the company has already assumed and cannot walk away from. The exposure is especially pronounced in long-tail [[Definition:Line of business | lines of business]] such as [[Definition:Asbestos and environmental liability | asbestos]], [[Definition:Professional liability insurance | professional liability]], and [[Definition:Excess casualty insurance | excess casualty]], where the interval between policy inception and final claim resolution can stretch over many years.

📐 Quantifying reserve risk typically involves stochastic modeling techniques that generate probability distributions around the [[Definition:Ultimate loss | ultimate loss]] estimate. [[Definition:Reserving actuary | Actuaries]] examine historical [[Definition:Reserve development | reserve development]] patterns, parameter uncertainty in projection methods, and potential systemic shifts — such as [[Definition:Social inflation | social inflation]] driving up verdict sizes — that standard models might understate. The output feeds into [[Definition:Risk-based capital (RBC) | risk-based capital]] calculations, [[Definition:Solvency II | Solvency II]] standard formula or internal model calibrations, and [[Definition:Rating agency | rating agency]] capital models. [[Definition:Reinsurance | Reinsurance]] programs, particularly [[Definition:Adverse development cover (ADC) | adverse development covers]] and [[Definition:Loss portfolio transfer (LPT) | loss portfolio transfers]], represent common tools for transferring reserve risk to third parties.

🛡️ Failure to manage reserve risk has toppled insurers outright. When reserves deteriorate faster than an insurer can replenish [[Definition:Surplus | surplus]], [[Definition:Insolvency | insolvency]] becomes a real possibility, as the collapse of several casualty writers in the early 2000s illustrated. [[Definition:Insurance regulator | Regulators]] therefore mandate stress testing of reserve adequacy under adverse scenarios, and boards of directors increasingly treat reserve risk as a standing agenda item. For investors and [[Definition:Mergers and acquisitions (M&A) | M&A]] acquirers, evaluating the reserve risk embedded in a target company's balance sheet is arguably the single most consequential part of due diligence — an overlooked reserve deficit can transform a seemingly profitable acquisition into a costly liability.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Reserve adequacy]]
* [[Definition:Adverse development cover (ADC)]]
* [[Definition:Loss portfolio transfer (LPT)]]
* [[Definition:Underwriting risk]]
* [[Definition:Social inflation]]
* [[Definition:Risk-based capital (RBC)]]
{{Div col end}}

Definition:Reserve risk - Revision history

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