Justice GINSBURG delivered the opinion of the Court.
This case involves a securities-fraud complaint filed by Connecticut Retirement Plans and Trust Funds (Connecticut Retirement) against biotechnology company Amgen Inc. and several of its officers (collectively, Amgen). Seeking class-action certification under Federal Rule of Civil Procedure 23, Connecticut Retirement invoked the "fraud-on-the-market" presumption endorsed by this Court in Basic Inc. v. Levinson...
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