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⚖️ '''Class action''' is a legal proceeding in which a group of individuals with substantially similar claims against a defendant pursue litigation collectively through named representatives, and it carries enormous significance for the insurance industry because of its potential to generate massive [[Definition:Claims severity | severity]] and [[Definition:Loss reserve | reserving]] uncertainty across [[Definition:Liability insurance | liability]] lines. Insurers underwriting [[Definition:Directors and officers liability insurance (D&O) | D&O]], [[Definition:Professional liability insurance | professional liability]], [[Definition:Product liability insurance | product liability]], [[Definition:Employment practices liability insurance (EPLI) | employment practices liability]], and [[Definition:General liability insurance | general liability]] classes face class-action exposure as a core peril that shapes pricing, policy wording, and [[Definition:Reinsurance | reinsurance]] purchasing decisions.

📂 When a class action is certified by a court, the insurer's exposure can expand from a single plaintiff's claim to thousands or even millions of claimants sharing in a common recovery. Defense costs escalate rapidly, and the binary nature of certification decisions creates pronounced [[Definition:Loss reserve | reserve]] volatility — a case worth modest reserves before certification may require tens of millions afterward. Insurers respond through policy mechanisms such as [[Definition:Defense costs | defense-cost]] sublimits, class-action exclusions in certain coverages, and [[Definition:Retention | retention]] structures that shift initial expense to the insured. [[Definition:Claims management | Claims teams]] often engage specialized panel counsel and deploy litigation management protocols to control costs during protracted proceedings.

🌐 The proliferation of securities, consumer, and privacy-related class actions has made this peril a central concern for [[Definition:Underwriting | underwriters]] operating in jurisdictions with plaintiff-friendly procedural rules, particularly the United States. [[Definition:Actuarial science | Actuaries]] struggle with the inherent uncertainty of class-action outcomes, as verdicts and settlements can range from nominal amounts to multi-billion-dollar figures, complicating [[Definition:Pricing | pricing]] models built on historical frequency and severity data. The growing intersection of [[Definition:Cyber insurance | cyber]] breaches and class-action litigation further illustrates how this legal mechanism continues to evolve and create new insurance exposures that carriers must anticipate.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Directors and officers liability insurance (D&O)]]
* [[Definition:Product liability insurance]]
* [[Definition:Defense costs]]
* [[Definition:Mass tort]]
* [[Definition:Employment practices liability insurance (EPLI)]]
* [[Definition:Social inflation]]
{{Div col end}}

Definition:Class action - Revision history

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