Can anyone explain to me why IB would charge me a $5200 margin requirement on a naked put sell on ISE stock at a $22.50 strike price for 1 contract? The most I could lose is $2250 if I got assigned and the stock went to zero. The way IB explained it to me is that since the ISE stock is currently trading at $52/share, that's what my margin requirement would be. Huh? What kind of logic is that? I'd be buying the stock at $22.50, but yet they want to charge me based on where the stock is trading today. Actually, according to the "check margin" feature that IB has, it was calculating my margin requirement to be for this trade at $4500, which is double the strike price. Doesn't make sense. I've been selling naked puts with IB for a long time and this is the first I noticed this type of calculation. It's eating up a lot of my capital. Plus, most brokerages calculate margin for a naked put sell in a much different way, which is usually a smaller figure. Anyone else noticing this issue?