Okla. Stat. tit. 18, § 18-809: License requirement

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.