From CNBC: 2024-05-22 03:27:25

British regulators fined U.S. investment bank Citi £61.6 million ($79 million) for system and control failings in trading. Citi qualified for a 30% reduction in penalty. The investigation covered April 1, 2018, to May 31, 2022, with incidents like a $1.4 billion trade executed due to a trader’s error on European exchanges.
Citi’s trading limitations led to incidents, including a $1.4 billion trade executed due to a trader’s input mistake on European exchanges. British regulators issued a £61.6 million fine to Citi for control failings in trading systems. Citi received a 30% reduction in the penalty for cooperating with the investigation, resolving the matter arising from an individual error over two years ago.

Read more: Citi fined $79 million by British regulators over fat-finger trading and control errors