Quote from TraderTony:
ddunbar -
Do you really find IB's behaviour in this matter as professional as you can get?
It is not a question of whether they should or should not offer minimum size as low as $25,000. The fact is they do and therefore it ought to work properly for customers who use it.
And even that is irrelevant - the issue is that their system allowed a partial fill on a stop order that LEFT a balance lower than their minimum trade size which could not then be filled. In principle, this would appear to be possible whatever the original position size. A $1m position could have been partially filled for, say $980,000 and exactly the same outcome would have resulted with a $20,000 position left stuck in the system.
It is a serious system flaw. That in itself is not unprofessional in my opinion. However, failing to both promptly sort out the consequences when the issue is brought to their attention and to provide reassurance that the system is fixed to prevent it happening in future are more than a little disappointing.