C.R.S. § 11-53-109

(1) The act, omission, or failure of any official, agent, or other person acting for any individual, association, partnership, corporation, or trust within the scope of his employment or office shall be deemed the act, omission, or failure of such individual, association, partnership, corporation, or trust, as well as of such official, agent, or other person. (2) Every person who directly or indirectly controls another person liable under any provision of this article, every partner, officer, or director of such liable person, every person occupying a similar status or performing similar functions to such liable person, and every employee of such liable person who materially aids in the violation is also liable jointly and severally with and to the same extent as the person liable under the provisions of this article unless the person who is also liable by virtue of this subsection (2) sustains the burden of proof that the person did not know, and in exercise of reasonable care could not have known, of the existence of the facts by reason of which the liability is alleged to exist.