marketmaker mar‧ket‧mak‧er [ˈmɑːktˌmeɪkə ǁ ˈmɑːrktˌmeɪkər] also market-maker noun [countable] FINANCE
a financial institution that always has supplies of shares available for buyers:
• the continued shortage of stock in the hands of marketmakers
• Each Big Board stock is entrusted to a single marketmaker, who constantly matches buy and sell orders.
Financial and business terms. 2012.