815 ILCS 602/5-125
Every person who directly or indirectly controls a person liable under Section 5-120 or 5-125 of this Law, every partner in a partnership so liable, every principal executive officer or director of a corporation so liable, every person occupying a similar status or performing similar functions and every employee of a person so liable who materially aids in the act or transaction constituting the violation is also liable jointly or severally with and to the same extent as such person, unless the person liable under this Section proves that he or she did not know, and in the exercise of reasonable care could not have known of the existence of the facts constituting the alleged liability. There is contribution, as in cases of contract, among the several persons held liable.
815 ILCS 602/5-125