uptick rule and automated trading

Our model development has almost finished. However, we are concerned about the execution. Since our margin for each trade is very thin, the commission is very important. We do $200,000 per trade on a single stock.
 
Quote from emk662:

Our model development has almost finished. However, we are concerned about the execution. Since our margin for each trade is very thin, the commission is very important. We do $200,000 per trade on a single stock.

might need to adjust for some slippage with that #
 
Quote from emk662:

I'm developing an automatic trading system. I am concerned about the uptick rule in short selling. Will I always have an unfavorable price? What can be taken to prevent any negative effect?

By the way, does uptick rule apply to limit order?

Uptick rule does not apply to ETF's like QQQ, SPY and DIA.
 
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