Adoboli, 32, from Whitechapel, east London, attended the court in a dark suit and red tie at the start of his trial for two counts of fraud and two counts of false accounting.
Arrested a year ago after the bank announced the losses, Adoboli denies the charges which are to be heard in a trial that is expected to last eight weeks. In September 2011, UBS announced it had "discovered a loss due to unauthorised trading".
Two of the charges allege false accounting, claiming he falsified records of exchange traded funds (ETFs) – complex financial instruments – between October 2008 and December 2009 and then between January 2010 and September 2011.
The third charge alleges he committed fraud between January 2011 and September 2011 while working as a senior trader in global synthetic equities. The fourth charge, of fraud, relates to activity between 1 October 2008 and 31 December 2010.
The prosecution is expected to begin its evidence on Friday. The case continues.
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