Jobber

noun

1. One who works by the job (i.e. paid per individual piece of work) and recruits other people.
2. A promoter or broker of stocks for investment.

   "An act to restrain the number and ill practice of brokers and stock jobbers: 8 & 9 Wm. 3, ch. 32 (1697) [legislation of English parliament"

3. An intermediary who buys and sells merchandise.
4. A type of intermediary in the apparel industry, as well as others, who buys excess merchandise from brand owners and manufacturers, and sells to retailers at prices that are 20-70% below wholesale.
5. A market maker on the stock exchange.