He first shorted it at just about its current price and has shorted it quite a few times since. Recent data showed that he maintained his short while GMCR kept its miraculous price rise. Since 33+% of all GMCR shares are still shorted, one can only assume that a goodly number are Einhorn's. Poor fellow!
Einhorn's second quarter letter to his clients had a substantial negative blurb on GMCR, which had a very significant gain during the quarter. It sounded like he has maintained his short position on this stock.