No account of class action litigation in the United States would be complete without reckoning with its dark side − nuisance litigation. A nuisance suit is a claim filed for settlement value in spite of knowledge on both sides that the claim is weak or non-meritorious. Common indicia of nuisance suits include frequent filings, often in the form of ready-made complaints with minor factual variation, repeat-play plaintiffs, and resolutions that yield insubstantial monetary recoveries to the class but that nevertheless entitle plaintiffs’ counsel to recover fees from the defendant. On the basis of these characteristics, class action nuisance litigation is perhaps best illustrated by shareholder suits challenging corporate mergers and acquisitions (M&A) transactions.