A stock that may be traded by an exchange member as well as on an exchange because it was listed after April 26, 1979. Prior to this date, exchange members were prohibited from making a market in exchange-listed securities. Thus, the change permits a member of an exchange to act as principal in making a market in a 19c-3 stock as well as to act as an agent in trading on the floor. This stock is named for SEC Rule 19c-3 that permits off-board trading.