Since the stock never traded that high today, this could not be bookkeeping. (a ridiculous idea in itself since that would be more than half the diy's volume). I am guessing that this is a prearranged sale in which one of the large holders realizes their profits at the favorable 2012 rates, meanwhile passing the shares to another entity which they control. If so, this should create a near term floor under the price.
Nope. Look at the intraday chart which shows huge volume at the close. I saw 1,854,135 shares cross inone lot, followed by another lot of 8,500 shares at the same price, all at the close. (this is from memory) Maybe someone sold the Baker Brothers a huge put? In any, case, I think a large holder wanted to book profits and had a prearranged sale. Let's see if they buy it back monday for a few cents more.