Quote from cstu:
Still a lot of misinformation on this thread. I will try to answer this later but Don is not entirely correct but if it helps to clear anything up market sell orders do take precedence over limit on the opg and on the close. But the reasons are quite logical and different than what is being explained.
If we have some examples, I would be glad to explain. I will say though that the one price opg and close is perhaps the most fair aspect of the exchange so...
I don't get it. The single price implies to me that there
is no precedence issue.
Take the short-sale out of the question and see if we can agree on this one:
Example 1:
6 different orders sent at 09:15 ET:
Buy 200 IBM MKT OPG
Buy 200 IBM MKT DAY
Buy 200 IBM LMT 82.00 OPG
Buy 200 IBM LMT 82.00 DAY
Buy 200 IBM LMT 83.00 OPG
Buy 200 IBM LMT 83.00 DAY
IBM closed at 80.24, and the spec expects to open on about 90,000 shares at 80.50.
Is there any reason why all 6 of these (marketable) orders would not be executed if the stock opens at 80.50? How can there be any precedence when they are all effectively marketable and guaranteed a fill?
Now, Example 2:
6 different orders sent at 09:25 ET:
Sell Short 200 IBM MKT OPG
Sell 200 IBM MKT DAY
Sell 200 IBM LMT 80.00 OPG
Sell Short 200 IBM LMT 80.00 DAY
Sell Short 200 IBM LMT 79.00 OPG
Sell 200 IBM LMT 79.00 DAY
IBM closed at 80.24, and the spec expects to open on about 90,000 shares at 80.50 (an uptick).
Is there any reason why all 6 of these (marketable) orders would not be executed at 80.50 if that is the opening price? How can there be any precedence when they are all effectively marketable, uptick-qualified, and guaranteed a fill?
Examples 3, 4:
Do the same things as 1 and 2 at 15:30 ET, subbing CLO for OPG. Assuming the close is 80.50 and that is a 0-plus tick, is there any way they don't all get filled?