Attributable Orders vs. Non-attributable Orders
Trading interest may be displayed by the market maker either as attributable orders or non-attributable through a market participant identifier (MPID). For attributable orders, the name of the market maker is displayed through one or more MPIDs next to the size of the order. Non-attributable orders allow the market maker to remain anonymous and display the anonymous MPID: MPID NSDQ. Non-attributa