Why is my order being held/monitored?

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…

The Market-on-Open (MOO) order type is available for some exchanges, but not all. Please visit the IBKR website to see the full list of supported Exchanges. Please note that Nasdaq MOO (and LOO) orders must be submitted prior to 09:28 ET, and that MOO orders for options must be directed to an exchange that supports this order type…

On certain markets you can use a Pegged-To-Stock order type in TWS. You can find information on Pegged-To-Stock orders on our website. Click on View Supported Exchanges…

For orders using the All or None (AON) attribute, IB will typically route to the native exchange, or hold the order if the AON order type is not supported by the primary exchange. When held, IB will attempt to simulate the order as follows:

• For US stock orders: The NBBO must qualify limit price AND the NBBO size must be equal to (or greater than) the order size + 1000 shares…