I remember reading someone had a strategy here to not show their hand (order pricing) when doing pre-market/after hours? I really can't think of what it was however....any clues?
If your broker allows it, you can submit hidden or island orders. Hidden orders are not visible and most likely must be routed directly to an exchange (i.e., no smart routing). Island orders are where only a portion of your shares are visible and they refresh when hit completely.