
Quote from u130747:
You can do both at IB long or short. The short will just be split to account for the uptick rule. But say for example you were long 500 shares and wanted to go short 500 shares. You would place an order to sell 1000 shares. Your account would go from 500 to -500. But the neat thing at IB is commission. You would pay for one order of 1000 shares. .01 for first 500 shares then .005 for the next 500 shares. So you save in commissions by lumping them in one order.. I do this all the time.
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