The Supreme Court will grapple with private securities class actions when it hears oral argument tomorrow in Halliburton v. Erica P. John Fund, Inc. The principal question in the case is the continuing validity of the fraud-on-the-market doctrine, endorsed by the Court twenty-five years ago in Basic Inc. v. Levinson, which relieves plaintiffs asserting claims under Section 10(b) of the Securities Exchange Act of the obligation to prove actual reliance, and permits the reliance element of a securities fraud claim to be satisfied presumptively by proof that the securities at issue traded on an efficient market.

Read the entire post on Mayer Brown's Class Defense Blog.