Create a Hidden Order
A Hidden order (generally a large volume order) shows no evidence of its existence in either the market data or the deep book.
To create a Hidden order
Display the Hidden field for stocks, and/or the Hide Pennies field for penny-priced equity options, on an order management line:
On the Page menu, click Layout.
In the Columns - Order Row section on the right side of the page, check Hidden and/or Hide Pennies, and click OK.
On the trading screen, create an order (click in the Ask Price to create a BUY order, or the Bid Price to create a Sell order).
Check the Hidden or Hide Pennies (for equity options) field.
To transmit the order, click the "T" in the Status field.
For a more detailed description of hidden orders, visit the Order Types information page.