Supreme Auto Transport, LLC v. Arcelor Mittal USA, Inc.

Wood, Chief Judge.

*737 This putative class action rests on allegations of a massive antitrust conspiracy within the domestic steel industry. Plaintiffs, indirect purchasers of steel, assert that eight U.S. steel producers colluded to slash output in an effort to drive up the price of steel nationwide. Years after their initial complaint, however, the plaintiffs transformed their theory of liability. The original complaint, filed in 2008, charged that plaintiffs overpaid for steel sheets, rods, and tubing manufactured by the defendants at their steel mills. Eight years later, the plaintiffs…