Preliminary Note to § 240.10b 5-2: This section provides a non-exclusive definition of circumstances in which a person has a duty of trust or confidence for purposes of the "misappropriation" theory of insider trading under Section 10(b) of the Act and Rule 10b-5. The law of insider trading is otherwise defined by judicial opinions construing Rule 10b-5, and Rule 10b5-2 does not modify the scope of insider trading law in any other respect. (a)Scope of Rule. This section shall apply to any violation