Former UBS trader Kweku Adoboli on Sept. 18, 2012.
November 20, 2012 The losses only came to light after former trader Kweku Adoboli told his bosses what he'd done, causing more than $2 billion dollars in losses and exposing UBS to as much as $12 billion in possible losses.
September 15, 2011 None of its clients were hurt by the unauthorized trading, the bank says. The trader suspected of causing the loss has been arrested in London.
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