the pecuniary interest of a limited class of persons or enterprises, when he or she, or his or her immediate family, or enterprises controlled by them, are members of the affected class. (d) General stock and securities rule An officer or employee of a committee or Member of either House of Congress, who is not a senior government employee covered by subsection (a), shall be in violation of subsection (c) if— (1) the officer or employee owns an interest in or trades (except as a divestment) individual stocks or securities