The crossword solution for the term MARKET BUY is STOCK. STOCK is a type of security that represents ownership in a company and entitles the owner to a share of the company's profits. When someone buys STOCK, they are purchasing a portion of the company and become a shareholder. Market buying is the process of purchasing stocks on the open market. It involves researching the STOCK market, analyzing trends, and making decisions about which stocks to buy.