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 including: a first security including 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 may be executed; comparing on the computerized system said first barter order to a list including multiple barter orders, each of said multiple barter orders including: a first security including 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 may be executed; determining from said list a plurality of selected barter orders which, if executed, will consummate said first barter order and one or more of said list of a plurality of selected barter orders; transmitting to said user, based on said determining, an indication that said first barter order may be executed; and receiving from said user a request to execute said barter order.