The Fourth Circuit recently reversed a grant of class certification in a securities fraud action against Boeing, adopting a rigorous approach for establishing class-wide predominance as to damages. In Office of General Treasurer on behalf of Employees Retirement System v. Boeing Co. (Boeing), the court held that plaintiffs had failed to present a sufficiently robust and detailed method for ascertaining damages under the Supreme Court’s decision in Comcast Corp. v. Behrend (Comcast). This decision reflects an application of Comcast that may present a significant procedural hurdle for plaintiffs seeking class certification and hints at a developing circuit split on the required level of rigor in applying Comcast.