If ABC reaches $10.00, ABC's limit order would be executed, and the XYZ limit order would be canceled. One sends other orders One sends other (OSO) orders are used when the trader wishes to send a new order only when another one has been executed. For instance, the trader may wish to buy stock ABC at $10.00 then immediately try to sell it at $10.05 to gain the spread. In this case, they would execute an OSO order composed of two parts: A limit buy order for ABC at $10.00, and a limit sell order for the same stock at $10.05. If ABC reaches $10.00, ABC's limit order would be executed, and the sell limit order would be sent. In short, multiple orders are attached to a main order, and the orders are executed sequentially. Tick-sensitive orders An uptick is when the last (non-zero) price change is positive, and a downtick is when the last (non-zero) price change is negative. Any tick-sensitive instruction can be entered at the trader's option, for example buy on downtick, although these orders are rare. In markets where short sales may only be executed on an uptick, a short–sell order is inherently tick-sensitive. At the opening At the opening is an order type set to be executed at the very opening of the stock market trading day. If it wouldn't be possible to execute it as part of the first trade for the day, it would instead be cancelled. Discretionary order A discretionary order is an order that allows the broker to delay the execution at its discretion to try to get a better price; these are sometimes called not-held orders. It is commonly added to stop loss orders and limit orders. They can be placed via a broker or an electronic trading system. Bracket Puts to the market a pair of two orders: For the same title, for the same direction, i.e., both to sell: One sell order is to realize the profit The second to lock the loss, not to get even deeper Quantity and display instructions A broker may be instructed not to display the order to the market. For example: An "All-or-none" buy limit order is an order to buy at the specified price if another trader is offering to sell the full amount of the order, but otherwise not display the order. A hidden (or "iceberg") order requires the broker