The Wall Street Initials are NYSE and OTC. The New York Stock Exchange (NYSE) is the largest stock exchange in the world, located on Wall Street in New York City. It is a publicly traded company and is the world's largest stock exchange by market capitalization. The Over-the-Counter Bulletin Board (OTCBB) is an electronic quotation system that displays real-time quotes, last-sale prices, and volume information for many over-the-counter (OTC) securities. It is not a stock exchange, but rather an electronic quotation system that provides investors with an efficient way to trade OTC securities.