544 U.S. 336 (2005) Cited 3,542 times 67 Legal Analyses
Holding that the securities statutes have a private of action “not to provide investors with broad insurance against market losses, but to protect them against those economic losses that misrepresentations actually cause”
Holding that joint participation pursuant to an agreement — express or implied — to commit a tort is necessary to impose liability on those acting in concert
Holding that "a group of unrelated investors should not be considered as lead plaintiff when that group would displace the institutional investor preferred by the PSLRA"
Holding that a Rule 23(c)(B) certification order must include two elements: " a readily discernible, clear, and precise statement of the parameters defining the class or classes to be certified, and a readily discernible, clear, and complete list of the claims, issues or defenses to be treated on a class basis"
Fed. R. Civ. P. 23 Cited 34,802 times 1232 Legal Analyses
Holding that, to certify a class, the court must find that "questions of law or fact common to class members predominate over any questions affecting only individual members"