Gox, one of the largest virtual currency exchanges, filed for bankruptcy in Tokyo amid reports that bitcoins worth $350 million had been stolen.[17] Flexcoin, a bitcoin storage specialist based in Alberta, Canada, shut down on March 2014 after saying it discovered a theft of about $650,000 in bitcoins.[18] Poloniex, a digital currency exchange, reported on March 2014 that it lost bitcoins valued at around $50,000.[19] In January 2015 UK-based bitstamp, the third busiest bitcoin exchange globally, was hacked and $5 million in bitcoins were stolen.[20] February 2015 saw a Chinese exchange named BTER lose bitcoins worth nearly $2 million to hackers.[21]