Squeezing the accelerator

Due to economic recession, hedge funds believed that the car company VW would also have problems selling its cars. That's why they thought VW shares were highly overvalued and would soon be falling. So, hedge funds lended 12 % of the VW shares from investors and did something called a short selling. However, hedge funds hadn't taken into account that the biggest VW investor, Porsche, had a cash-settled call option to increase its present shares at VW from 35 % to 74 %. So when Porsche announced that it wants to increase its shares at VW, this caused an explosion of the share value of VW. Thus in order to minimize losses, hedge funds had to quickly buy VW shares at a much higher value at which they had lended them. This again caused the value of VW shares to rocket. Early estimates suggested that the hedge funds' losses could be as much as $ 30 billion.