Today, the Supreme Court issued its Decision in Halliburton v. Erica P. John Fund. The decision upholds the Court’s prior Basic v. Levinson holding allowing the fraud on the market theory that presumes reliance, however; the Court agreed with Halliburton that defendants could rebut the presumption pre-class certification with evidence that an alleged misrepresentation did not actually affect the stock price. According to Law360, the decision “will likely make it somewhat more difficult for plaintiffs to bring securities class actions, but it stopped short of closing a major door.”.