Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and, (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and, (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and, (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: One exemplary aspect comprises a computer-implemented method comprising: (a) electronically receiving, from a first securities market participant, data including information related to a first order and to one or more group rankings for dissemination; (b) electronically determining with one or more processors, based on data regarding a second securities market participant and the order information and group rankings, whether the second securities market participant has a second order, on the contra side of the first order, and whether, in accordance with the group rankings, the second securities market participant is qualified to receive information about the first order; and (c) after, and only if, the second participant is determined to be qualified, transmitting information sufficient to display to the second securities market participant the information about the first order.

Abstract: A computer implemented trading system is described comprising a plurality of buy computers (1,2) connected via a communications network (3) to a plurality of seller computers (4,5), a plurality of public exchange computers (6,7) and a trading platform computer (8). The trading platform computer (8) is arranged to receive order data from the buy computers (1,2) and the seller computers (4,5). An order processing system (14) provided on the trading platform computer (8) processes the received data to generate output data indicative of the orders received by the order processing system (14) but which is processed so as to obscure the detail of received orders by calculating proximity between one or more actual orders in combination with randomised numbers. The generated data is then dispatched back to the buyer computers (1,2) and seller computers (4,5) where it is displayed as part of a user interface.

Abstract: A computer implemented trading system is described comprising a plurality of buy computers (1,2) connected via a communications network (3) to a plurality of seller computers (4,5), a plurality of public exchange computers (6,7) and a trading platform computer (8). The trading platform computer (8) is arranged to receive order data from the buy computers (1,2) and the seller computers (4,5). An order processing system (14) provided on the trading platform computer (8) processes the received data to generate output data indicative of the orders received by the order processing system (14) but which is processed so as to obscure the detail of received orders. The generated data is then dispatched back to the buyer computers (1,2) and seller computers (4,5) where it is displayed as part of a user interface.