At the opening order

At the opening order

In context of general equities, market order or limited price order that is to be executed at the opening (and corresponding price) of the stock or not at all, and any such order or portion thereof not so executed is to be treated as cancelled.

At the Opening Order

1. An order to buy or sell a security at the best price available when an exchange opens.

2. An order to buy or sell a security at its opening price when an exchange opens. If this price is not available, the order is canceled.