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Who cares how they do it, as long as you own the half share? I assume they aggregate all the shares they hold across the whole firm and hence are at most long or short up to 0.5 of a share of each stock. Likely a rounding error in terms of exposure, and they could hedge it with SPY or...

Yes, if you want to place marketable orders for large numbers of shares of stock, a fixed price commission will be better for you.

There are ways to allocate extra memory and graphics resources when you start up TWS, some command line arguments I forget. It may help if you're running into resource issues.

Profitable ones? ;)

No, you can't hold a long and short position at IB - they will net them.

Deductible health insurance, better retirement plan options, you can "pay yourself" a stable income and qualify for income-based things like mortgages or HELOCs after a few years. Business expenses I think are the same either way, but not 100% sure. Personally, I'd focus on the trading. If...

The market makers must be doing just fine if they've got $26M to lose. You want market makers who are smart enough that they take advantage of jerks like this. If anyone actually knew what the stock was worth, these sorts of tricks wouldn't work - either they wouldn't succeed in tricking...

From what I read, they weren't making transactions between their own accounts - you can't make $26M trading with yourself! They were putting in lots of small orders that seemed to have tricked the market makers into outbidding them and eventually they traded with the market makers at more...

Can you give an exact example? I tried with a stock and once I sent and later paused the direct routed order, i could no longer change the destination in the drop down like you can when you first create it.

https://www.interactivebrokers.com/en/software/tws/usersguidebook/getstarted/trade_treasuries.htm

So is $3.20 too high or too low, given you're only getting $2.91 paid out next year? Is there any business left?

I've run into this. I think it's a large multiple of your account equity or current buying power (10-20x?), certainly a lot more than you could support if everything filled at once. In practice, I only ran into it when I had a premarket order for a stock where there was no ask quoted yet. The...

Good call. Here come another 10M+ shares, stocks down almost $100/share today. http://finance.yahoo.com/news/dryships-inc-announces-registered-direct-142633366.html

All the bad shipping companies are rallying and when DRYS got halted, the day traders had to go somewhere else. Condolences to anyone short these. http://blogs.wsj.com/moneybeat/2016/11/16/unmoored-from-reality-dryships-halted-after-1500-post-election-rally/

The one IB sent to anyone holding them saying they were ramping requirements up to 50% a little each day in Nov until Election Day.

The note on VIX margin came out a week ago. It's not if the election result is going to be a surprise, it's that there's an election at all (and that was hard to miss!).

They raised margin requirements on VIX products too, and warned you well in advance. They do this kind of thing around major political events each time. It shouldn't be unexpected and arguably it's not unreasonable either. They don't owe you the right to borrow lots of money from them all the...

If you check out the last earnings call, their market making unit is definitely for sale and/or on the chopping block. Their profits were way down and they aren't competitive these days without more expertise / HFT infrastructure on the equity side which they lack (they do ok on the options...

Well I've been looking at a number of these effected stocks since I was trying to trade them before and they definitely traded tighter than $0.05 before, often 1-3 pennies wide. Maybe some were wider, I don't know, but were they all wider than $0.10 consistently when the trades actually...

Well it was as small as a penny, and now it will be at least a nickel. Does that sound narrower?