Wild Man : I suggest phoning your Broker to place a buy or sell order rather than placing your order online.
I also suggest buy or sell lots that can be easily matched, eg, 10,000 shares ( buy or sell ) rather than 10,400 which may not be as easily matched.
Remember, Market Makers are forbidden from making a market so a buyer or seller must guess.
To bite the worm of incite is to bite the HOOK of the antagonist . They win .