Germany's JAB Holding Co is leading a $13.9 billion buyout of Keurig Green Mountain Inc, known for its K-Cup single-serve coffee pods, in a deal that would strengthen its position in North America. The deal, pitched at a rich 78 percent premium to Keurig's Friday closing price, is the latest by JAB, the investment vehicle of the billionaire Reimann family, as it tries to become a formidable competitor to world coffee market leader Nestle SA. Here's what caught my eye ... The stock, which last traded at $92 in May, is heavily shorted, with nearly 13 percent of the...