Opening arguments were heard by the jury in New York on Tuesday in a lawsuit brought by a group of investors.
Including pension funds, who allege that the bank fixed currency pair spreads from late 2007 to 2013 via internet chat rooms.
The lawsuit claims that traders from other worldwide banking behemoths, such as Citigroup Inc., UBS Group AG, Barclays Plc, JPMorgan Chase & Co., HSBC Holdings Plc., and Deutsche Bank AG, participated in this.
The trial takes place as the Swiss lender prepares for its second reorganisation in as many years while also trying to reassure investors about its capital and liquidity.
The investment bank, which has accumulated enormous losses and taken part in the front lines of the crisis.
Might face significant cutbacks as a result of the reorganisation.