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The central issue in United States v. O'Hagan, No. 96-842, is the validity of the so-called "misappropriation theory" of insider trader liability under Section 10(b) of the Securities and Exchange Act of 1934. 15 US.C. 78(j)(b). The justices heard oral arguments in April. If the theory propounded by federal regulators is endorsed by the Court, it would expand insider trader liability under U.S. law.



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