Abstract: The systems and methods relate to a new securities order type—the MON Order—which remains undisplayed and does not become executable until a minimum trigger quantity is reached, thereby making such order executable. The MON Order includes information that indicates a symbol of the security, the number of shares of the security to buy/sell, the side of the order and a trigger quantity. For limit orders, the order also includes a limit price. The MON Order may be received by an initial trading center that may determine whether the trigger quantity is satisfied based on the available number of shares for the security in the marketplace, where the available number of shares is based on the aggregate of (i) the displayed and undisplayed liquidity for the security at the initial trading center, and (ii) the displayed accessible liquidity at one or more away trading centers that is known to the initial trading center.