Abstract: The present invention discloses a system for real-time trading of options contracts between a plurality of traders over a computer network. The system includes a computer network, a market server, and two or more trader clients. The market server is operably connected to the computer network. The two or more trader clients are operably corrected to the computer network such that each of the trader clients can be placed into operable communication with the market server. Each of the trade clients facilitates entry and transmission of commands in substantially real-time to the market server and display of substantially real-time updates from the market server. The trader client commands include trade orders wherein the market server distributes the trade orders and any executions of same to each of the trader clients in substantially-real time.