"Employees' securities company" means any investment company or similar issuer all of the outstanding securities of which (other than short-term paper) are beneficially owned

           (A) by the employees or persons on retainer of a single employer or of two or more employers each of which is an affiliated company of the other,

          (B) by former employees of such employer or employers,

           (C) by members of the immediate family of such employees, persons on retainer, or former employees,

           (D) by any two or more of the foregoing classes of persons, or

           (E) by such employer or employers together with any one or more of the foregoing classes of persons.