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Thomas 'Tom' Hayes, 35, a former trader at banks including UBS Group AG and Citigroup Inc., arrives for his trial at Southwark Crown Court in London, U.K., on Wednesday, June 3, 2015. Hayes is accused of eight counts of conspiracy to manipulate the London interbank offered rate, the benchmark used to value more than $350 trillion of loans and securities, from 2006 through September 2010. Photographer: Simon Dawson/Bloomberg via Getty Images

Thomas 'Tom' Hayes, 35, a former trader at banks including UBS Group AG and Citigroup Inc., arrives for his trial at Southwark Crown Court in London, U.K., on Wednesday, June 3, 2015. Hayes is accused of eight counts of conspiracy to manipulate the London interbank offered rate, the benchmark used to value more than $350 trillion of loans and securities, from 2006 through September 2010. Photographer: Simon Dawson/Bloomberg via Getty Images