RE:Trading Question Hi Dread,
You must be trying to purchase some odd-lot, something less than 500 shares. You will still remain at the top of que but typically odd-lots will only be matched with other odd-lots, which is why you see other full-lot orders going through. This is why I typically aim to round up my orders in hundreds or thousands, but if you want to fill that order, a trick is moving the limit price up a half penny or penny on the remainer to help fill it.
hope this helps.