3. Mt. Gox Hack
Bitcoin is a virtual currency that can be exchanged for real money by numerous exchange companies. Some say that bitcoin is the currency of the future. By 2013, Mt. Gox was the biggest exchange in the business, handling more than 70% of exchanges. But in 2014, the company’s luck changed. Almost half of billion USD worth bitcoins were stolen from the company. The company never recovered and filed for bankruptcy in 2014.