Bithumb () is a South Korean cryptocurrency exchange. Founded in 2014, with headquarters in Seoul, it initially went by the name Xcoin, but was rebranded as Bithumb in 2015.
In October 2018, BK Global Consortium signed an agreement to acquire a majority stake in BTC Holding Co., Bithumb's largest investor.
On January 22, 2019, the OTC-listed holding company Blockchain Industries signed a binding letter of intent to merge with Bithumb on or before March 1, 2019. The proposal called for the creation of a new publicly traded entity, the Blockchain Exchange Alliance (BXA), which would seek to uplist on either the New York Stock Exchange or NASDAQ, potentially making BXA the first major cryptocurrency exchange to go public.
On April 11, 2019, Bithumb reported a net loss of KRW205.5 billion (US$180 million) for 2018, compared with a profit of KRW427.2 billion in 2017, although its 2018 sales had risen 17.5% to KRW391.7 million. The company attributed the loss to the sharp decline in cryptocurrency prices and lower trading volume.
In June 2017, hackers stole user information from a Bithumb employee's personal computer.
In January 2018, Bithumb was raided by the government for alleged tax evasion. They were found not guilty, but still had to pay nearly $28 million in back taxes.
In June 2018, approximately $32 million of cryptocurrency was stolen from Bithumb in a hack.
In January 2019, 30 out of 340 total Bithumb employees were laid off in response to declining trading volume and profits in 2018.
On March 29, 2019, Bithumb said it had been hacked, blaming insiders, with nearly $20 million in EOS and Ripple tokens stolen.
On September 2, 2020, local Korean news reported that Bithumb was raided by the Seoul Metropolitan Police Agency over suspected investment fraud.
In January 2026, Bithumb mistakenly transferred 2,000 bitcoin to the accounts of 695 customers. The total transferred was in excess of US$40 billion. The stated that they reversed the transaction within 35 minutes and managed to recover 99.7% of the funds.