unlisted-securities marketa MARKET for dealing in company STOCKS and SHARES that have not obtained a full STOCK EXCHANGE quotation. The unlisted-securities market enables smaller companies to raise new capital without the formalities and expense of obtaining a full listing on the main exchange. An unlisted-securities market was established in the UK in 1980, currently called the ‘Alternative Investment Market’.
Collins Dictionary of Economics, 4th ed. © C. Pass, B. Lowes, L. Davies 2005