Citi fined $78 million after a European trader's fat-finger trade caused a flash crash in stocks

• A trading mistake at Citigroup in 2022 has led to a $78 million fine against the bank.
• The "fat-finger" trade caused a brief flash crash in European stocks in May 2022.
• The brief flash crash caused by the mistaken trade briefly wiped out $322 billion in market value.

A trading mistake at Citigroup has resulted in a $78 million fine.

A trader in Citigroup's London unit entered one too many zeros in a trade in May 2022, sparking a short-lived flash crash in European stocks.