Abstract: A method for facilitating securities transactions is shown. In one embodiment, the method includes identifying, by a computer system from an OMS comprising a plurality of stored security orders, a subset of orders specifying at least a minimum available quantity; transmitting, by the computer system to an ETM, a non-binding indication corresponding to one order of the subset of orders, the non-binding indication comprising a security identifier and the order type; receiving, by the computer system, an indication that a match exists to the non-binding indication; determining, by the computer system, a total available quantity for the order corresponding to the non-binding indication; and transmitting, by the OMS, a binding order corresponding to the non-binding indication, the binding order comprising the determined total available quantity. Corresponding systems are also described.