I never use selling at market for order type because a MM or market maker what it stands for can run down pricing on purpose to pocket commission's I don't know but I think a lot of brokers will not even allow the use of market type of orders on penny stocks just like you can't seem to use trailing stops.. I suggest only the use of limits because you could try to unload millions of shares and the MM can just keep selling your stuff lower than you deserve while triggering everyone else's stops..
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