When Citigroup ( C) jumped up 2% on April 14, Karen Finerman reported on "Fast Money" that the stock's move was a "fake winner" caused by a "gigantic short squeeze."
A short squeeze occurs when short-sellers quickly buy in shares of the stock in order to cover their bearish positions, driving the price of stocks up sharply. The ratio for measuring short-squeeze opportunities is the short ratio, which is the number of days it would take the short sellers to cover their position based on recent average daily volume. Stockpickr compiled a portfolio of the top Nasdaq short-squeeze plays, all of which have market caps of more than $250 million. To read more, visit Stockpickr.com.