According to standard terminology used in the securities industry, when a person sells securities out of inventory, that person is acting in the capacity of a (an):

Jake and janelle loved to prepare gourmet meals for friends and family. they started a business of preparing theme-type dinners for friends who were having parties. to generate even more interest in the business, janelle created on her website. she posted pictures of events, and close-ups of the food they served. she encouraged patrons and others to post reviews, comments, and favorite recipes, and to share their own party ideas. her promotion became a dialogue between buyers of her service and the business. interactive promotion infomercials product placement broadcast