(a) For purposes of this chapter, control is the power to direct, or cause the direction of, the management and policies of a person, other than power that results from an official position with the person or a corporate office held by the person. The power may be possessed directly or indirectly by any means, including through the ownership of voting securities or by contract, other than a commercial contract for goods or nonmanagement services.
(b) A person is presumed to control another person if the person directly or indirectly owns, controls, holds with the power to vote, or holds proxies representing 10 percent or more of the voting securities of the other person. This presumption may be rebutted by a showing that the person does not in fact control the other person.