Lately the FT, Blodget and the NYT wrote about computer programs that drive stocks higher or lower for profits over incredibly short periods.
The first thing to note is that in order to make enough money to get people out of bed, the trading volume of these operations would have to be north of 300 million shares a day - which leaves only a few firms that the SEC will be looking into; Northtown (started by the BATS founder - who pioneered the rebate system), Citadel, Lime, Renaissance jump to mind.
The second thing to say, is this sort of thing doesn't cost you money; Individual investors benefit from tighter spreads. For instance, if you decide to buy 100 shares of MSFT and a high-frequency trader sells them to you, this can only get you a better price (nor is your order likely to be big enough for them to pick off).
Lastly, there is a lot more to the rebate-capture trade than the front-running aspect. Or to be more accurate, if you get front-run by one of these guys your trader is not doing his or her job properly - these guys live by the sword, I suggest they die by it. The rebate works as follows: if you are a liquidity provider (someone else takes/hits your offer/bid) you are eligible for a rebate on the execution cost. Most hedgefunds pay no less than 0.5c per share when they trade electronically and a rebate can be as high as 0.25c per share. Only a few companies (see above) can drive their costs below the potential rebate.
I don't normally write about work, but market structure is a fascinating area of the business. I look forward to seeing how this plays out...
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