A trading strategy may be controlled according to determining whether the order quantity for each leg of the trading strategy satisfies a certain condition. The quantity for each of the orders of the trading strategy, including the quantity of the initial order and subsequent orders, is compared to a corresponding risk value. When the order quantity for each of the orders is less than the corresponding risk value, the initial order can be sent. When the order quantity for any of the orders exceeds the risk value, the initial order is not sent. Quantity associated with the trading strategy is held or reserved for execution of the trading strategy regardless of the activity taken by the trader since initiating the trading strategy. The reserved quantity can be drawn from the trading strategy until the quantity is depleted, the trading strategy has ended, or both.