Mt. Gox was a widely-known Bitcoin exchange based in Tokyo, Japan. It was launched in 2010, and by 2013 was handling 70% of all Bitcoin transactions. In February 2014, the Mt. Gox company suspended trading, closed its website and exchange service, and filed for bankruptcy. It announced that around 850,000 bitcoins belonging to customers and the company were missing and likely stolen, an amount valued at more than $450 million at the time. Although part of the missing bitcoins have since been found, the reasons for the disappearance are still unclear.