Mt. Gox
Karpelès acquired the Mt. Gox Bitcoin exchange site from programmer Jed McCaleb in 2011 which was later incorporated in Tokyo, with its original owner receiving 12% shares of the new company. Mt. Gox filed for bankruptcy in Japan on February 28, 2014, and for Chapter 15, Title 11, United States Code bankruptcy in the United States (Texas) in March 2014.