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⚖️ '''Derivative suit''' is a legal action brought by a shareholder on behalf of a corporation — rather than in their own name — alleging that the company's directors or officers have breached their fiduciary duties, and it carries particular significance for the insurance industry because it represents one of the core exposures covered under [[Definition:Directors and officers insurance (D&O) | directors and officers (D&O) liability insurance]]. In these cases, the plaintiff shareholder steps into the corporation's shoes to pursue claims the company itself has declined or failed to bring, often targeting mismanagement, self-dealing, or corporate waste. The damages recovered, if any, flow back to the corporation rather than directly to the suing shareholder.

🔍 Procedurally, the shareholder must typically demonstrate that they made a demand on the board to take corrective action — or that such demand would have been futile — before filing suit. Courts scrutinize whether the board's refusal to act was protected by the [[Definition:Business judgment rule | business judgment rule]] or whether the alleged misconduct is serious enough to override that deference. From the insurer's perspective, derivative suits implicate the "entity coverage" and "Side B" provisions of a D&O policy, which respond when the corporation indemnifies its directors and officers for defense costs and settlements. [[Definition:Underwriting | Underwriters]] evaluating D&O risk pay close attention to corporate governance practices, board independence, and the history of shareholder activism when pricing this exposure.

🛡️ Derivative litigation can be extraordinarily expensive, with defense costs alone running into the tens of millions of dollars for publicly traded companies. High-profile cases — such as those arising from [[Definition:Mergers and acquisitions (M&A) | mergers and acquisitions]] or accounting scandals — routinely generate both derivative and direct [[Definition:Securities class action | securities class action]] claims simultaneously, compounding the insurer's potential payout under a single D&O tower. For [[Definition:Insurance carrier | carriers]] writing D&O coverage, sophisticated [[Definition:Claims management | claims management]] and early intervention strategies are essential to controlling loss severity, while clear policy language around allocation between covered and uncovered claims helps avoid costly coverage disputes.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:Directors and officers insurance (D&O)]]
* [[Definition:Fiduciary liability insurance]]
* [[Definition:Securities class action]]
* [[Definition:Corporate governance]]
* [[Definition:Side A insurance]]
* [[Definition:Employment practices liability insurance (EPLI)]]
{{Div col end}}

Definition:Derivative suit - Revision history

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