Mo. Rev. Stat. § 407.820

Any person who is engaged or engages directly or indirectly in purposeful contacts within the state of Missouri in connection with the offering, advertising, purchasing, selling, or contracting to purchase or to sell new motor vehicles, or who, being a motor vehicle franchisor, is transacting or transacts any business with a motor vehicle franchisee who maintains a place of business within the state and with whom he or she has a franchise, shall be subject to the jurisdiction of the courts and administrative agencies of the state of Missouri, upon service of process in accordance with the provisions of section 506.510, irrespective of whether such person is a manufacturer, importer, distributor or dealer in new motor vehicles.