564 U.S. 338 (2011) Cited 6,689 times 505 Legal Analyses
Holding in Rule 23 context that “[w]ithout some glue holding the alleged reasons for all those decisions together, it will be impossible to say that examination of all the class members' claims for relief will produce a common answer”
Holding that district court must make a "definitive assessment of Rule 23 requirements" and "resolve[] . . . factual disputes relevant to each Rule 23 requirement"
Holding that an aggregate determination that “bears little or no relationship to the amount of economic harm actually caused” violates the Rules Enabling Act
Holding that "reliance by doctors on misrepresentations as to the efficacy [of a drug was] not a but-for cause of the price that TPPs ultimately paid for each prescription" because "prescribing doctors do not generally consider the price of the medication when deciding what to prescribe for an individual patient," and there was no proximate causation because TPPs, who "were in a position to negotiate the price paid for [the drug]," had failed to allege that they had relied on the defendant's fraudulent conduct
Fed. R. Civ. P. 23 Cited 35,153 times 1237 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"
Expanding the meaning of the "initial bona fide offering date" from the date of a post-effective registration statement amendment, to the date of a post-effective registration statement supplement, with regard to issuer and underwriter liability