A quantity modifier and a price modifier are provided for a spread trading strategy having a desired spread price and a desired spread quantity. According to an example embodiment, a quantity modifier divides the desired spread quantity into a plurality of disclosed spread quantities. Once the disclosed quantities are determined, a plurality of disclosed spread orders having the disclosed spread quantities are sequentially submitted to the market until the full desired spread order quantity is executed or until a predefined condition is detected. A price modifier determines a price level for each disclosed spread quantity, such that each disclosed spread order may be submitted at a different price level.