http://progressivetradinggroup.com/resources/futures-specifications/#Financials They offer 12.5% intraday margin on accounts $5k or more, although there is no minimum to open (you just won't get the 12.5%). They also offer Ninjatrader with Rithmic, and clear through Vision Financial. No fee structure published, but I assume it's negotiable based on volume and size and probably not as deep as some other IB's but still pretty close. The one issue I have is that I can't seem to find anyone anywhere who uses them, although Vision seems to be pretty reputable from what I understand. I'm currently with Crossland, but the way they make me play musical chairs with my margin limits is driving me nuts, and I also don't like that TT (my data feed) doesn't provide any historical data, and I may have to look at paying $50 a month just to get it. My understanding is that Rithmic does provide that data, so switching for that reason alone will save me $50 a month, on top of possibly a faster/better data feed and more aggressive margin rates.