Certification? A walk in the park. We need to show: (1) the class is so numerous that joinder of all members is impracticable; (2) there are questions of law or fact common to the class; (3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and (4) the representative parties will fairly and adequately protect the interests of the class. There are other requirements (https://www.law.cornell.edu/rules/frcp/rule_23) but securities class actions like this are routinely certified.