According to 5 oz pain, the cause is a single investor buying 5,300 shares at once. It could be someone at EXC or CBS trying to make it look like nothing is wrong and distract them from all the bad news.
Apparently EXC is such a small stock its asking price has little to do with its actual value.
5 Oz. Feature: Breaking down ProElite’s current situation :Five Ounces of Pain