The Financial Services Authority (FSA) announced the fine on Monday.
Adoboli, 32, was jailed last week for seven years after gambling away $2.3 billion of the lender's money.
"UBS's systems and controls were seriously defective," said Tracey McDermott, the FSA's director of enforcement and financial crime.
A jury in London last week found the Ghanaian-born banker guilty of two counts of fraud, though it cleared him of four charges of false accounting.
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