Quote from Cre8UrF8:
Does Portfolio Margin work with a stock against a stock (not options)? For example, if I have 1,000 shares of KO long and 1,000 shares of PEP short, do I get 6:1 leverage under portfolio Margin or only Reg-T 2:1 overnight?
Yes. You can get maybe even more than 6:1 leverage (stock, overnight) if you structure the trade/trades right.
You don't even have to pair trade to be able to use that kind of leverage. I have only long positions in my account and I am able to use more than 5:1 overnight leverage.