A Market-on-Open (MOO) order combines a market order with the OPG time in force to create an order that is automatically submitted at the market's open and fills at the market price.
To place a Market-on-Open order from the Mosaic Order Entry panel:
- Enter or select a symbol and then click Buy or Sell
- Set the order size and select MKT as the order type
- Click in the Time in Force (TIF) field and choose OPG
- Complete the order parameters
- Hit SUBMIT.
Find out more on the Market on Open orders page of the IBKR website.