10. Groupon

Sector: Internet

52 Week Stock Performance: -56.9 Percent

Groupon is one of those companies which has gone from being the top-notch firms to being surrounded by troubles. Forbes and Wall Street Journal said that Groupon was "projecting that the company is on pace to make $1 billion in sales faster than any other business, ever” in December 2010. But the company too feel from grace. In October 2011, Forrester Research suggested that the business model of Groupon was a "disaster" and the company showed "how fast an Internet darling can fall."

Bear Case: Groupon has been under immense pressure after its accounting firm said that it had “weak internal controls.” As a result, its stock value is plummeting. Also, it is facing massive losses.