The term STK-EXCHANGE LISTINGS is an acronym for Stock EXCHANGE Listings. This refers to the listing of a company's stock on a public stock EXCHANGE, such as the New York Stock EXCHANGE or the NASDAQ. Companies must meet certain criteria in order to be listed on a stock EXCHANGE, such as having a minimum number of shareholders and a minimum market capitalization. The COS in this crossword solution stands for Common Stock, which is a type of security that represents ownership in a company. Common stock holders are entitled to vote on corporate matters and receive dividends when declared by the company.