Patent ID: 7725381

Claim:
A method for use in an anonymous trading system enabling users to select order preconditions including price, volume, and bid or offer and counterparty trader preconditions, said method comprising, providing each user with an interface via which each user may add trader preconditions regarding available counterparties, which trader preconditions at least comprises an expression of the user's willingness to trade with selected counterparties that does not necessarily depend on a credit rating for each of the selected counterparties; collecting all added trader preconditions from the users; combining the trader preconditions into a trader precondition matrix; using the trader precondition matrix and order preconditions for determining matching criteria for orders sent in by users; wherein the method further comprises: assigning a unique identity alias to each of multiple users; displaying the unique identity alias in relation to displayed orders to maintain anonymity of the users; and subsequently assigning and displaying a new unique identity alias to each of the users when a predetermined condition is met.