- June 19, 2011: a security breach of the Mt. Gox bitcoin exchange caused the nominal price of a bitcoin to fraudulently drop to one cent on the Mt. Gox exchange, after a hacker allegedly used credentials from a Mt. Gox auditor's compromised computer illegally to transfer a large number of bitcoins to himself. He used the exchange's software to sell them all nominally, creating a massive "ask" order at any price. Within minutes the price corrected to its correct user-traded value. Accounts with the equivalent of more than USD 8,750,000 were affected.
- February 22, 2013: following an introduction of new anti-money laundering requirements by Dwolla, some Dwolla accounts became temporarily restricted. As a result, transactions from Mt. Gox to those accounts were cancelled by Dwolla. The funds never made it back to Mt. Gox accounts. Mt. Gox help desk issued the following comment: "Please be advised that you are actually not allowed to cancel any withdrawals received from Mt. Gox as we have never had this case before and we are working with Dwolla to locate your returned funds." The funds were finally returned on May 3, more than 3 months later, with a note "Please be advised never to cancel any Dwolla withdrawals from us again".
- May 2, 2013: CoinLab filed a $75 million lawsuit against Mt. Gox alleging a breach of contract. The companies announced a partnership in February 2013 under which CoinLab would handle all of Mt. Gox's North American services. CoinLab's lawsuit contends that Mt. Gox failed to allow them move existing U.S. and Canadian customers from Mt. Gox to CoinLab.
- May 15, 2013: the US Department of Homeland Security (DHS) issued a warrant to seize money from Mt. Gox's US subsidiary's account with payment processor Dwolla. The warrant suggests the US Immigration and Customs Enforcement (ICE), an investigative branch of the DHS, felt the subsidiary, which should have been licensed by the US Financial Crimes Enforcement Network (FinCEN), was operating as an unregistered money transmitter in the United States.
Suspension of trading
- April 11, 2013 -- April 12, 2013 2am UTC: Mt. Gox suspended trading for a "market cooldown". The value of a single bitcoin fell to a low of $55.59 after the resumption of trading before stabilizing above $100.
- June 20, 2013: Mt. Gox suspended withdrawals in US dollars
- July 4, 2013: Mt. Gox announced that it had "fully resumed" withdrawals, but as of September 5, 2013, few US dollar withdrawals had been successfully completed.
- August 5, 2013: Mt. Gox announced that they have incurred "significant losses" due to crediting deposits which had not fully cleared. Mt. Gox announced that new deposits would no longer be credited until the funds transfer to Mt. Gox is fully completed.
Withdrawals delayed or refused
- November 2013: Wired Magazine reported that customers were experiencing delays of weeks to months in withdrawing funds from their accounts. The article said that the company had “effectively been frozen out of the U.S. banking system because of its regulatory problems.” Customer complaints about long delays were mounting as of February 2014, with more than 3300 posts in a thread about the topic on the Bitcoin Talk online forum.
- February 7, 2014: all Bitcoin withdrawals were halted by Mt. Gox. The company said it was pausing withdrawal requests “to obtain a clear technical view of the currency processes.” The company issued a press release on February 10, 2014 stating that the issue was due to transaction malleability.
- February 17, 2014: with all Mt. Gox withdrawals still halted and competing exchanges back in full operation, the company published another press release indicating the steps they claim they are taking to address security issues. In an email interview with the Wall Street Journal, CEO Mark Karpeles refused to comment on increasing concerns among customers about the financial status of the exchange, did not give a definite date on which withdrawals would be resumed, and wrote that the exchange would impose "new daily and monthly limits" on withdrawals if and when they were resumed. A poll of 3000 Mt. Gox customers by CoinDesk indicated that 68% of customers were still awaiting funds from Mt. Gox. The waiting time was between one to three months. 21% of poll respondents had been waiting for three months or more.
- February 20, 2014: with all withdrawals still halted, Mt. Gox issued yet another statement, giving no date for the resumption of withdrawals. Protests outside Mt. Gox headquarters in Tokyo continued. Citing "security concerns", Mt. Gox announced they had moved their offices to a different location in Shibuya. Bitcoin prices quoted by Mt. Gox dropped below 20% of the prices on other exchanges, reflecting the market's estimate of the unlikelihood of Mt. Gox paying their customers.
- February 23, 2014: the CEO of Mt. Gox Mark Karpeles resigned from the board of the Bitcoin Foundation. Immediately following this, all posts on their Twitter account were removed.
- February 23, 2014: Mtgox.com site went offline and all internal trades halted.
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