Chipotle Mexican Grill ( CMG ) After surging nearly 100 points from lows in the $240 range to near $340 within seven months, this stock has become a top performer. Short selling is a highly effective method toprofit from falling stock prices, but can be risky and is only suitable for more advanced investors who understand the risks involved, which I'll mention later. It's Wall Street's high expectations combined with climbing food prices, sky-high valuations and increased competition from Yum Brands' Taco Bell restaurants.