Mo. Rev. Stat. § 301.442
Whenever a business is sold by the owner thereof and as part of the sale the ownership of one or more commercial motor vehicles is transferred, or whenever an individual or partnership transfers ownership of a business and commercial motor vehicles owned by him or them to a corporation substantially owned by him or them in a nontaxable transfer under the provisions of the United States Internal Revenue Code, the original owner of any such vehicles may transfer the registration plates issued for such vehicles to the new owner who, upon notification to the director of revenue of the sale or transfer of ownership of the business and transfer of the registration plates, may use those registration plates for the remainder of the current registration period as if he, they, or it had originally purchased the plates. The director may prescribe the necessary forms for use in making the notification and may require that the notification be made under oath.
§ 301.442, RSMo