Abstract: According to some embodiments, a securities order trading system may determine, during a trading session, one or more attributes of an order destination. The attribute or attributes may be other than a price quoted or a size of an order booked on an order destination. The trading system may also determine during the trading session, and based on the order destination attribute or attributes, at least one of whether to route an order to the order destination, and a proportion of the order to allocate to the order destination.

Abstract: According to some embodiments, a securities order trading system may determine, during a trading session, one or more attributes of an order destination. The attribute or attributes may be other than a price quoted or a size of an order booked on an order destination. The trading system may also determine during the trading session, and based on the order destination attribute or attributes, at least one of whether to route an order to the order destination, and a proportion of the order to allocate to the order destination.

Abstract: An options trading system may include a routing system that receives an options trading order from a customer and divides the customer order into secondary orders. Each of the secondary orders may be sent to a respective securities exchange for execution. The size of some or all of the secondary orders may be determined on the basis of a published automatic execution (“auto ex”) order size for each exchange for the option in question. For example, the customer order may be divided into four secondary orders each of which matches the respective auto ex size for the respective exchange for the option in question, plus a fifth secondary order that exceeds the auto ex size for the respective exchange for the option in question.

Abstract: According to some embodiments, components of a financial trading network may display financial instrument trading information on a display screen. The financial instrument trading information may include a first menu for displaying a first set of alternatives with respect to a first order parameter such as a trading symbol or an order destination. User input may be received to indicate selection of an alternative from the first set of alternatives. A second menu may also be displayed as part of the financial instrument trading information. The second menu may be for displaying a second set of alternatives with respect to a second order parameter such as an order destination or an order type. The second set of alternatives which constitute the second menu may be selected based at least in part on the alternative selected by the user from the first set of alternatives.

Abstract: According to some embodiments, a securities order trading system may determine, during a trading session, one or more attributes of an order destination. The attribute or attributes may be other than a price quoted or a size of an order booked on an order destination. The trading system may also determine during the trading session, and based on the order destination attribute or attributes, at least one of whether to route an order to the order destination, and a proportion of the order to allocate to the order destination.