Looks like someone dumped 12,000 shares at a price of 8.00 at 1:46 PM. Everything else is just the usual bits and pieces.
Judging from Altima's latest Form 4, when they sold off 360,000 shares on 11/2/12, they still have another roughly 1.2 million shares left. No doubt they will want to sell that remaining 1.2 mil stake - but I doubt that one individual trade of 12K was not Altima. There are plenty of other institutional investors who are by now getting nervous.
Having said that, there is no doubt in my mind that by the end of this month, Altima will make another major sale of at least 300k to 500k shares, may be even more.