Abstract: A collection of one or more trade orders for a financial instrument is priced or re-priced to one side of a market center order book based on a target execution price (representing the least favorable price acceptable for all trade orders of the collection), a book depth (representing the collection's book depth), a total order quantity (representing the total quantity of financial instrument units to be traded), and a maxshow (representing the maximum quantity to be shown on the order book at each price level of the book depth). Any existing orders of the collection that are too close to the current market price or too far from the target execution price are canceled or CXR'd, starting with the closest price level to the current market price for “too close” trade orders and the farthest price level from the Target Execution Price for “too far” trade orders.