Supreme Court of the United States June 6, 2011, No. 09-1403 (Erica P. John Fund, Inc. v. Halliburton Co.)

OPINION OF THE COURT

[563 U.S. 807]

Chief Justice Roberts

delivered the opinion of the Court.

To prevail on the merits in a private securities fraud action, investors must demonstrate that the defendant’s deceptive conduct caused their claimed economic loss. This requirement is commonly referred to as “loss causation.