Cover-OCO for legged order

A trading device comprising:

• a market data receiver configured to receive market data identifying an inside market for a first tradeable object and a second tradeable object;
• a graphical user interface configured to provide output from the trading device as processed data to a user and to receive input from a user, where the graphical user interface receives a request from the user to trade a synthetic spread order for a quantity of a synthetic spread, the synthetic spread including at least a quoting leg for a first tradeable object and a hedge leg for a second tradeable object;
• and
• an electronic processor coupled with the market data receiver and the graphical user interface, where the electronic processor is configured to:
• cause a quoting order for the first tradeable object to be submitted to an electronic exchange in response to receiving the request from the user,
• cause a hedge order for the second tradeable object to be submitted to the electronic exchange in response to receiving from the electronic exchange confirmation of a fill of at least part of the quoting order,
• monitor the market data for the inside market for the first tradeable object,
• identify that the synthetic spread order has a filled leg and an unfilled leg, where the hedge order is unfilled and the quoting order is filled,
• determine that the inside market for the first tradeable object has moved a predetermined amount,
• cause a bracket order to be submitted to the electronic exchange for the first tradeable object in response to a determination that the inside market has moved the predetermined amount and an identification of that the synthetic spread order has the filled leg and the unfilled leg, and
• cause the graphical user interface to display an order descriptor representing a status of the synthetic spread order.