Supreme Court allows early rebuttal of efficient markets theory

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Abstract: A recent U.S. Supreme Court ruling could have a significant effect on private securities fraud class actions. This article describes how the Court gave corporate defendants the right to rebut the efficient markets theory presumption at the class certification stage. Allowing such rebuttals could make bringing class actions more difficult for shareholders. The court, however, didn’t go as far as many corporations had hoped. Halliburton Co. v. Erica P. John Fund, Inc. (U.S. 2014) Basic Inc. v. Levinson (U.S. 1988)