Network of dealers $($by phone and computer$)$ ready to either buyor sell securities at negotiated prices.$$ Dealers profit from spread between buy and sell prices.$$ The national NASDAQ market is a type of OTC, though its listingrequirements are similar to that of a mature stock exchange.$$ NASDAQ has other OTC markets $($OTC Bulletin Board and PinkSheets$)$ where very small and extremely risk stocks may trade