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By Fred Fuld
Last Tuesday, Geron(GERN Quote) spiked by as much as 21% after forming an alliance with GE Healthcare, a unit of General Electric(GE Quote), to develop test products from embryonic stem cells.
A likely contributor to Geron's quick rise was that more than 16% of the stock's float was shorted, which could have caused a short squeeze.
A short squeeze occurs when short-sellers quickly buy in shares of a stock in order to cover their bearish positions, driving the price of the stock up sharply. The ratio for measuring short squeeze opportunities, called the short ratio, reflects the number of days it would take the short-sellers to cover their positions based on recent average daily volume. ...
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