A TRADER wiped £256billion off the value of shares by accidentally adding an extra zero to a deal.
The broker’s “fat finger” gaffe caused Swedish stocks to crash eight per cent within five minutes.
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Exchanges in Denmark, Norway, Germany, Italy and France also dipped but later recovered losses.
Bosses at Citigroup have placed the trader on leave.
The bank is expected to take a hit of at least £39.7million.
Citigroup believes the mistake was down to human error rather than the fact that the trader was working from home.
It is in talks with regulators and exchanges about the May Bank Holiday blunder.
The error will raise questions over banks letting traders work remotely.
Citi chief executive Jane Fraser has ordered thousands of employees to focus on improving risk systems.
In 2020, the firm blamed human error for wiring almost £717million to a group of hedge funds instead of an interest payment of less than £6.3million.
A US judge called it “a banking error of perhaps unprecedented nature and magnitude”.
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