Listing Agreement authorizing FCBB to represent you in the sale of your business. The documents you need to buy or sell a business depend on the structure (discussed here) and complexity of the deal as well as its specific terms.A "dealer" shall mean and include any person, firm, association or corporation engaged in the business of buying and selling securities from or to the public. Investment Agreement Contracts. Money laundering enables criminal activity and is necessary to disguise illgotten gains.