Depends whether you’re holding it as SPY/VOO or as a mutual fund (assuming you don’t mean SPX futures, and SPX itself isn’t tradeable). IBKR has somewhat higher margin requirements than the minimums set by the OCC; I think they require 25% maintenance margin for mutual funds and 10-15% for broad-based stock indices.
Just curious, what maintenance margin do IBKR/Ameritrade require for this box spread?
I suppose they might depend on the nature of the collateral, so let’s assume my collateral is 100% SPX.
i.e. if I were to max out the box spread loan amount, what’s the maximum percentage that my collateral could drop before IBKR issues the margin call?
Depends whether you’re holding it as SPY/VOO or as a mutual fund (assuming you don’t mean SPX futures, and SPX itself isn’t tradeable). IBKR has somewhat higher margin requirements than the minimums set by the OCC; I think they require 25% maintenance margin for mutual funds and 10-15% for broad-based stock indices.