The market rallied this week, but one group of stocks has really surged: heavily shorted stocks, including commodity companies such as Freeport McMoRan and Transocean and industrials like Deere.
In an exclusive video for CNBC Pro subscribers, Bob Pisani explains what shorting a stock means and why you must keep an eye on names that are being heavily shorted by hedge funds.
Watch the video below for all the highlights:
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