Mo. Rev. Stat. § 135.408

A qualified investment in a Missouri small business may be made either through an unsecured loan or the purchase of equity or unsecured debt securities of such business. Investors in a small business qualifying for tax credits under the provisions of sections 135.400 to 135.430, however, must collectively own less than fifty percent of a business after their investments are made. Qualified investments in a Missouri small business must be expended for capital improvements, plant, equipment, research and development, or working capital for the business or such business activity as may be approved by the department.