Quote from gambler2075:
Dude, sorry to put it bluntly, but either you have never been sub-pennied, or you are an idiot.
There are many stocks I have traded, in the ~1.00$ range, that are subpennied. What does this mean? well, let's say that ABK is trading at 1.01 bid by 1.02 ask. And lets say you want to get a fill on the bid. If you put in a bid at 1.01, and you were the only one to have that bid price, any shares sold would get sold to you.
This, however, is where the subpennying screws you... immediately after seeing that 1.01 order, a computer puts in an order at 1.0101.
This means that your order will never be filled... Instead, you have to buy at the ASK in order to get filled. Which means you take an automatic 1% loss. And this is just one side of the transaction. When you try to sell, you cannot sell into the ask, because, lets say you want to sell at 1.02... immediately after placing your ask, you get subpennied and a computer steps in front of your order and puts an ask at 1.0199. This means you will never get filled on your ask, and there is nothing you can do about it because you, as the retail trader, cannot place subpenny orders... So you have to sell to the bid. BAM, another 1% loss.
Over time, these add up.
Another example which I have had happen to me MANY TIMES is where you can see a large bid which has been sitting there for several minutes. However, when you go to sell a limit order maybe 2-3% BELOW that price which is displayed, that limit order immediately disappears BEFORE filling your order, and your sell order does not take that bid out.
I have had that happen with me with ETRM, and 100K share sell orders... The computer will have a large bid displayed, that sees your ask, which was placed BELOW that bid, then immediately that bid gets pulled before you can sell your shares to it.
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