https://www.insurerbrain.com/w/index.php?action=history&feed=atom&title=Definition%3AAdverse_development_coverDefinition:Adverse development cover - Revision history2026-06-13T19:32:51ZRevision history for this page on the wikiMediaWiki 1.43.8https://www.insurerbrain.com/w/index.php?title=Definition:Adverse_development_cover&diff=15636&oldid=prevPlumBot: Bot: Creating new article from JSON2026-03-15T04:00:46Z<p>Bot: Creating new article from JSON</p>
<p><b>New page</b></p><div>🛡️ '''Adverse development cover''' is a form of [[Definition:Retroactive reinsurance | retroactive reinsurance]] in which a [[Definition:Reinsurer | reinsurer]] agrees to indemnify a [[Definition:Ceding company | ceding insurer]] for [[Definition:Loss reserve | loss reserve]] deterioration on claims arising from events that have already occurred. Unlike prospective [[Definition:Reinsurance | reinsurance]], which protects against future losses, adverse development cover (ADC) addresses the risk that an insurer's existing [[Definition:Reserves | reserves]] prove insufficient — that actual paid claims on a defined book of business will exceed the reserves currently established for those liabilities. This makes it a targeted tool for managing [[Definition:Reserve risk | reserve risk]] and balance sheet uncertainty.<br />
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⚙️ An ADC contract typically attaches above the ceding company's current carried reserves for a specified portfolio or accident year range, with the reinsurer covering losses that develop beyond that attachment point up to a defined limit. For example, an insurer carrying $500 million in reserves for [[Definition:Casualty insurance | casualty]] business written between 2010 and 2020 might purchase an ADC that covers reserve development between $500 million and $750 million. The [[Definition:Premium | premium]] for the cover reflects the reinsurer's assessment of the probability and severity of adverse development, the [[Definition:Discount rate | time value of money]], and the specific [[Definition:Line of business | lines of business]] involved — with [[Definition:Long-tail insurance | long-tail lines]] such as [[Definition:General liability insurance | general liability]], [[Definition:Workers' compensation insurance | workers' compensation]], and [[Definition:Asbestos liability | asbestos]] being the most common subjects. Under [[Definition:US GAAP | US GAAP]], retroactive reinsurance accounting rules require specific treatment for ADC transactions, and [[Definition:IFRS 17 | IFRS 17]] introduces its own measurement considerations for such contracts.<br />
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💡 ADCs have become a staple of insurance [[Definition:Mergers and acquisitions (M&A) | M&A]] and [[Definition:Legacy insurance | legacy]] transactions globally. A buyer acquiring an insurance company can use an ADC to cap its exposure to reserve surprises in the acquired book, making the deal more financeable and reducing post-close volatility. Run-off specialists and legacy platforms — such as those operated by [[Definition:Enstar Group | Enstar]], [[Definition:Riverstone | Riverstone]], and parts of [[Definition:Berkshire Hathaway | Berkshire Hathaway's]] reinsurance operations — are frequent providers of ADC capacity. Regulators in the United States, the UK, and other markets generally view ADC favorably when properly structured, as it transfers genuine economic risk and strengthens the ceding company's ability to meet [[Definition:Policyholder | policyholder]] obligations. The growth of the legacy and run-off market has made adverse development covers one of the most dynamic segments of the global reinsurance landscape.<br />
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'''Related concepts:'''<br />
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* [[Definition:Retroactive reinsurance]]<br />
* [[Definition:Loss reserve]]<br />
* [[Definition:Legacy insurance]]<br />
* [[Definition:Run-off]]<br />
* [[Definition:Long-tail insurance]]<br />
* [[Definition:Loss portfolio transfer (LPT)]]<br />
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