Why is the market-on-open (MOO) order type not available?

Interactive Brokers may simulate certain order types on its books and submit the order to the exchange when it becomes marketable. The IBKR website contains a page with exchange listings which will each include an expandable "Order Types" section. This section lists the various order types that are either native to the exchange or simulated by IBKR. For more information, please…

If Hidden Orders are not native to the exchange and are simulated by IBKR, they will not be active in the exchange order book and do not participate in the auction.

You can see which order types are native or simulated on a specific exchange in the Exchange Listings area of our website…

Any size stock order, even if it is not in a round lot increments, can be submitted using a MOO, LOO, MOC or LOC order type. When you SMART route an At-the-Opening or At-the-Close order type, it will be routed to that symbol's primary listing exchange and given to the Specialist. There is never a guarantee that the Specialist will have enough shares available to match all the Buy and Sell orders they receive for an opening or closing cross. Orders are filled on a priority basis with the earliest submitted Market-on-Open orders filled first. If there are any shares still available to cross, the marketable Limit-on-Open orders with the earliest time stamps are next in line. If your order did not get filled, then there were not enough shares available for all of the orders submitted for the Opening or Closing cross trade…

The Conditional order type does not support Stop or Stop Limit Orders. It is possible to select other order types such as Limit or Market in the conditional order.

If you wish to enter a conditional order on a position, right click on the position in your portfolio and select Trade followed by Order Ticket. Configure the order as desired (please note, all order types may not be available). To attach the condition, click on the Conditional tab at the top and configure as desired…