Gox, one of the largest virtual currency exchanges, filed for bankruptcy in Tokyo amid reports that bitcoins worth US$350 million had been stolen.[45] Flexcoin, a bitcoin storage specialist based in Alberta, Canada, shut down in March 2014 after saying it discovered a theft of about $650,000 in bitcoins.[46] Poloniex, a digital currency exchange, reported in March 2014 that it lost bitcoins valued at around $50,000.[47] In January 2015 UK-based bitstamp, the third busiest bitcoin exchange globally, was hacked and US$5 million in bitcoins were stolen.[48] February 2015 saw a Chinese exchange named BTER lose bitcoins worth nearly $2 million to hackers.[49]