Patent ID: 8751359

Claim:
A system for conducting security transactions, comprising: a client device; a client interface that in operation executes on the client device and is configured to receive a client order; a host server which in operation receives the client order from the client via the client interface and executes logic resources for carrying out the client order, the host server also comprising; a pricing engine; a target engine which determines a target number of shares of a security to be held by an inventory account; and a trading engine that in operation is configured to process the client order, wherein the trading engine enables the trading of fraction shares in real time as well as reduces the frequency of orders sent to market by executing the order principal trades against the inventory account and to the extent the order cannot be filled using the inventory account, against the market in a market order, and in the same market order purchases a number of shares necessary to meet the target number of shares set by the targets engine for the inventory account.