COMMENT: I have some theories about trading in AMRI on the day in question. AMRI has been trading in a range that started in September 2011. Although AMRI fell as low as $2.08, the basic range has been between $2.20 and $3.50. After a recent slide back down into the lower end of that range, the stock has been meandering back up toward the high end of that range. Similar to the market in general, AMRI has been rising on low volume, which is no a good sign (for various reasons)
As for the rise on the day in question, there was absolutely nothing remarkable and there was absolutely no reason whatsoever to take note of it. Volume was tepid. I would not be surprised to see AMRI bounce around as it chugs back toward the high end of its current trading range. It is a good idea to take note of the volume as well as the price change on any given trading day. In the absence of volume, any price change is rendered less meaningful. Commentators on Bloomberg TV make frequent references to their proprietary indicator, Money Flow, which I think involves both price and volume.