Yes you can. Margin rules are on our website under the Trading section, or you can use the Search function.
You could margin the stock at 50% (and possibly lower depending on your SMA / Reg T requirment). So with 100k of stock, margined at 50%, you'd have 50k buying power for futures trading.
Our customer service desk should be able to answer these questions. If you already have an account with us, you can complete a Trouble Ticket via the Account Management menu, otherwise help@interactivebrokers.com
