Fraud on the Market After Amgen

30 Pages Posted: 13 Dec 2013

See all articles by James D. Cox

James D. Cox

Duke University School of Law

Date Written: December 11, 2013


Contemporary applications of fraud on the market have been premised on the efficient market hypothesis, a theory that describes stock price formation in a perfect world rather than the issue central to the role of fraud on the market - how investors behave (i.e., rely). As a result, fraud on the market has been out of step with how investors reach investment decisions. This article examines the underlying tenets of recent Supreme Court decisions addressing causation in securities fraud cases to reason that fraud on the market can be reconfigured slightly so as to be consistent with both the role that presumptions have played in the Roberts Court as well as congressional intent underlying The Private Securities Litigation Reform Act. As developed here, reliance will persist as an element of the case but in a manner that accommodates a wide range of active and passive investment behavior such as indexing and style investing.

Suggested Citation

Cox, James D., Fraud on the Market After Amgen (December 11, 2013). Duke Journal of Constitutional Law & Public Policy, Vol. 9, No. 101, 2013. Available at SSRN:

James D. Cox (Contact Author)

Duke University School of Law ( email )

210 Science Drive
Box 90362
Durham, NC 27708
United States
919-613-7056 (Phone)
919-613-7231 (Fax)

Register to save articles to
your library


Paper statistics

Abstract Views
PlumX Metrics