Short sellers are exposed to a risk of short squeezing, which occurs when the shorted stock jumps in value because, for instance, there is a sudden piece of favorable news. Short sellers are then forced to buy back the stock they had initially sold, in an effort to keep their losses from mounting. The market demand they create by purchasing the stock to cover their short positions further raises the price of the shorted stock, thus triggering more short sellers to cover their positions by buying the stock. This can result in a cascade of stock purchases and an even bigger jump of the share price.[3][4][5]