traders on Island. I called Ameritrade about why my after hours buy of a stock at 21.20 did not execute when I saw a few trades go buy on time&sales lower than my bid. Found out that my trade was on BRUT and the other trades were matched trades on Island. Nice way to manipulate - 2 people can plan that 1 buy and 1 sell at exact same price on Island. Those low trades were either panicky newbies or an attempt to drive the stock down a bit so they can buy cheaper in the morning. They were small trades as well. NUVA will be up many points next week.