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The Future of Price Distortion in Federal Securities Fraud Litigation

In its recent Halliburton decision, the Supreme Court focused on the role of price distortion in meeting the requirements for class certification in private securities fraud litigation. Accepting the argument that the fraud-on-the-market theory requires fraudulent information to have an effect on stock price, the Court reasoned that defendants should therefore be allowed to introduce evidence of lack of price impact in an effort to defeat class certification. Specifically, the Court suggested that defendants might introduce event studies as direct evidence that could sever the link between the misrepresentation and