The article looks at the implications of the recent antitrust class action decision by Canada’s Supreme Court in Pioneer Corp. v Godfrey (Godfrey). It considers how the position in Canada, post-Godfrey, on three key procedural issues in class actions (What is required to prove commonality of injury at certification?; Are limitation periods subject to discovery?; and Are umbrella damages available?) compares with that in the U.S. and the UK, and assesses the potential of Godfrey to affect the development of private antitrust damages actions globally.