Antitrust class actions confront companies in a wide range of industries with high stakes litigation, and the continued globalization of commerce has increasingly given rise to simultaneous exposure and potential liability in multiple jurisdictions. The United States and Canada exemplify this modern reality: both authorize private parties to assert antitrust class action claims and successive free trade agreements have led to extensive cross-border commerce between the two countries. So it is not surprising that parties to antitrust class action cases increasingly are involved in proceedings in both jurisdictions at the same time. Published in the Spring 2011 edition of Antitrust (Vol. 25, No.2) by the American Bar Association.