Potash Down 4% (POT)

Shares of Potash Corp. POT are getting killed on Tuesday. The shares are currently trading down more than 4% at $182.33 and is sitting at new lows for the day. Despite the sell-off, POT shares are still up more than 6% in the last month. One new shareholder in the company is David Einhorn's Greenlight Capital, which revealed the stake in their most recent 13-F filing.