A brokerage company’s main duty is to act as a middleman that connects buyers and sellers to facilitate a transaction. Brokerage companies typically receive compensation by means of a commission (either a flat fee or a percentage of the amount of the transaction) once the transaction has successfully completed. For example, when a trade order for a stock is executed, an investor pays a transaction fee for the brokerage company’s efforts to complete the trade—Read more at Investopedia. Hayes, Adam. “Brokerage Company.” 8 May 2019.