RE: Are these guys selling and buying the 100 andThis is just a guess on my part . It does look like a computer is programed to trade the stock probably more than one .
Every 30 sec or so a trade goes through for 100 or 200 shares . It follows trend or maybe starts or changes trend . Depending on the momentum it senses from the bid ask sizing .
It also puts in a price at which it will buy 4000 to 5000 shares at the bid but only after the one is sold . So it will sit for hours putting 5000 shares in at 7.55 a few secs after the one offered is taken .
Probably more complicated than that .
jack