IB NYSE Arca MOC order not filled

Is that a fact? How do they know you are short selling vs. closing existing position?

broker must send that info...think about it if they don't know there is no need to have uptick rule. big trading shop won't have this issue as they usually holds all kinda positions.
 
one more thing i noticed ib charges 10x more commission when arca route is used...smart actually still routes to arca but saves A LOT on commission
 
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