I don't think its Institutions, just small frytaking some profits in the main. Its Jan. 4 2011 and they don't have to worry about IT until spring of 2012.
I know my broker has mentioned that several of the brokers at his firm were recommending that their clients take some money off the table.
In my opinion this is extremely short sighted, given what is coming down the pipe. Selling at what will soon be cash value for the stock or even less is not my idea of taking profits and verges on negligence for handing out such questionable advice..