Originally posted by jperl
Htrader-
Your example seems to be a variant of the one described in my question- Your answer is interesting but I don't think I understand it. Perhaps you could give us a more detailed picture by putting some dollars and cents into the picture to see what the money flow looks like for some imaginary account. I think we would all appreciate it. Also-is there a reference to this weird regulation( I couldn't find anything at the SEC site).
Let me try again. Assume you have a stock XYZ that is at $20, constant. You are LONG 100 shares overnight at $20, with nothing else in your margin-enable account, no cash. To make things simply, also assume 50% margin maintenance requirement at all times. You are fully maxed on your margin, thus your account is only worth $1000.
There are now two scenarios. In scenario 1, you sell your 100 share position, nothing else happens. In scenario 2, you sell your 100 share position, and then buy it back the same day.
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Scenario 1: You enter the day with a $2000 position. Assuming a margin requirement of 50% for overnight holds, your buying power is $0.
You now sell that 100 share position at $20, resulting in $2000 in proceeds. You now have an account equity of $1000, with a buying power of $2000
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Scenario 2: You enter the day with a $2000 position. Assuming a margin requirement of 50% for overnight holds, your buying power is $0. (same as scenario 1)
You now sell that 100 share position at $20. Then you buy that 100 share position AGAIN. Certain brokers are required to match trades on an intraday basis. This means that when you reenter your long position, your first trade to sell is now considered a short. Why? Because you now have two intraday trades. The first was selling of a stock, the second was buying of a stock. These two trades match each other. Thus this is considered a complete round trip, even though you ended up with stock in your account.
The implication of this is that when you first sold that 100 share position at $20, instead of closing your overnight long, the broker thinks you initiated a NEW short position. Thus requiring $2000 of NEW margin, which of couse you don't have, causing you to have a margin call.
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Check out this link by cybertrader if you are still confused.
http://www.cybertrader.com/faq/margin.asp#1
Lastly, I don't know the SEC rule number for this, but I have heard it referred to as a "daytrading call."
Htrader