Abstract: A computerised trading system for the trading of financial instruments or commodities which enables anonymous presentation of quotes on a workstation while still allowing the workstation to filter available quotes for display, on the basis of the nature of the originating party. A central server or network connects a plurality of workstations, each associated with a respective trading floor or institution. For each trading floor or institution, generalized institution status indicators are used to provide display filtration criteria, each indicator indicating a non-specific attribute of the respective institution.