Patent ID: 7844539

Claim:
A method of trading combined orders for the purchase or sale of securities and derivatives in an exchange configured for trading securities and derivatives by a combination of electronic and open-outcry trading mechanisms comprising: receiving an incoming order having a first order component and a second order component at an interface in communication with an electronic trade engine; routing the first order component to a first electronic database in the electronic trade engine; routing the second order component to a second electronic database in the electronic trade engine; matching and executing the first order component against an order component maintained in the first electronic database according to matching rules accessed by the electronic trade engine; matching and executing the second order component against an order component maintained in the second electronic database according to the matching rules accessed by the electronic trade engine; and placing any unexecuted first and second order components in an electronic book according to a predetermined program if the first or second order component cannot be completely matched against any order components maintained in one of the first or second electronic databases.