Stock exchanges are financial institutions that facilitate the trading of stocks, bonds, and other securities. They provide a platform for buyers and sellers to come together and trade in a regulated environment. The two most common stock exchanges are the New York Stock Exchange (NYSE) and the Nasdaq. SHARES (SHARES) are units of ownership in a company or other organization. MOOS (MOOS) is an acronym for Market On-Open Order System, which is a type of order used in stock exchanges to buy or sell a security at the opening price of the market.