Kweku Adoboli, an ETF trader at UBS, is suspected of unauthorised trading which cost the bank £1.3bn. But UBS is far from alone in suffering the sting of internal fraud, as this gallery of the world's most infamous rogue traders shows...
Jerome Kerviel: Loss of £3.5bn
Outside the Madoff Ponzi scheme, Kerviel's losses from bad deals on the European markets are reported to be the largest fraud in banking history.
The former Societe Generale trader "breached five levels of controls" in the bank, and was "a genius of fraud", according to Christian Noyer, the governor of the Bank of France.
Kerviel - who made no personal financial gain on the fraud - was sentenced in October 2010 to three years in prison by a Paris court.
Yasuo Hamanaka: Loss of £1.6bn
Japanese trading house Sumitomo Corp fell victim to a ten-year scam from unauthorised copper trades, primarily by chief trader Hamanaka.
Sumitomo sacked Hamanaka, whose trading team was believed to control 5% of the world's copper trading. He was later jailed for eight years.
Nick Leeson: Loss of £800m
Barings investment bank collapsed after Leeson, a futures trader in Singapore, ran up liabilities worth more than the entire capital and reserves of the bank.
In 1995 a court in Singapore sentenced him to six years in prison. Barings was subsequently sold to Dutch bank ING for £1.
Toshihide Iguchi: Loss of £700m
Japan's Daiwa Bank received a nasty shock in 1995 after Iguchi, one of its senior US executives, confessed in a letter that he had incurred the loss through unauthorised bond trading. He was imprisoned a year later.
John Rusnak: Loss of £437m
Rusnak defrauded Allied Irish Bank's US subsidiary. He was sentenced to seven years in prison after he admitted a scam in which he pocketed £537,000 in salary and bonuses between 1997 and 2001.
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