Erica P. John Fund, Inc., Fka Archdiocese of Milwaukee Supporting Fund, Inc. v. Halliburton Co.

Summary

The Supreme Court held that securities fraud plaintiffs need not prove loss causation in order to obtain class certification under Federal Rule of Civil Procedure 23(b)(3), vacating the Fifth Circuit judgment that had imposed such a requirement. The Court reasoned that loss causation—whether the alleged misrepresentation caused the investors' eventual economic loss—is conceptually distinct from reliance, so proof of loss causation cannot be a precondition for invoking Basic's rebuttable fraud-on-the-market presumption, which turns only on whether the misrepresentation was reflected in the market price at the time of the transaction. Rejecting Halliburton's contention that the court below had really applied a 'price impact' test rather than a loss causation test, the Court took the Court of Appeals at its word, concluded the decision below could not stand, and remanded for consideration of any preserved certification arguments.