1. A method for facilitating the bartering of publicly traded securities on a computerized system, comprising: receiving on the computerized system a first barter order from a user comprising: a first security comprising a quantity thereof to be sold in said first barter order, a second security different from the first security to be purchased in said first barter order concurrent with the sale of the first security, and a condition relating to the value of said first barter order under which condition said first barter order is available to be executed; comparing on the computerized system said first barter order to a list comprising multiple barter orders, each of said multiple barter orders comprising: a first security comprising a quantity thereof to be sold in a barter, a second security different from the first security to be purchased in said barter concurrent with the sale of the first security, and a condition relating to the value of said barter under which condition said barter is available to be executed; determining, on the computerized system, from said list a plurality of selected barter orders which, if executed, will consummate said first barter order and one or more of said plurality of selected barter orders; transmitting from the computerized system to said user, based on said determining, an indication that said first barter order is available to be executed; and receiving by the from said user a request to execute said first barter order.