US Patent 7890411 Trading actual shares of a security in a round-lot-based system

A round-lot-based system for trading of securities includes a plurality of client stations for entering quotes for securities and a server process. The system receives quotes from the clients, aggregates the quotes and causes a total of all aggregated quotes to be displayed for a plurality of price levels on the client systems. The system uses a graphical user that depicts aggregated quotes in an aggregate window, and a plurality of price levels of a product traded in the market. The system also aggregates round, odd, and/or mixed lot orders into an aggregate of actual shares. The aggregate of actual shares may be placed on a book and rounded down to the nearest round lot for displaying on the round-lot-based system.