Okla. Stat. tit. 18 § 809
Except as provided in Section 815 of this title, no person shall hold an interest in a domestic professional entity including a domestic professional entity that owns a domestic professional entity rendering professional service who is not duly licensed or otherwise permitted in accordance with the provisions of this state's licensing laws for the profession or related profession to render the same professional services or related professional services as those for which the entity is organized. No person shall be a shareholder of a professional corporation who is not duly licensed or otherwise permitted to render the same professional services or related professional services as the services for which the corporation is organized. An owner of a qualified foreign professional entity need not be duly licensed if he or she is not rendering professional services in this state.
Okla. Stat. tit. 18, § 809