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I agree that it is important to correct your question in that you are seeing actual trades and not orders. Near the opening you are likely seeing the crossing of the opening Spins of NYSE and Nasdaq. You will see the same occur after the close with the closing NYSE Exchange spin. During the day it is also possible that large prints are the flip out of an ...


Let's say you have an order with 10 shares open. Now you want to cancel it down to 6 shares. If you send just the open quantity you can have the following scenario: Reduce to 6 sent 3 shares got executed by the exchange while the reduce above was in-flight The exchange finally receives and processes the reduce, bringing the open quantity now to 6 The ...

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