He'd denied the allegations but Kweku Adoboli has been found guilty of the biggest fraud in British history. The 32-year-old's actions resulted in the loss of $2.3 bln. Adoboli was working as a senior trader in London for the Swiss bank UBS when news of the losses were announced. After a 10-week trial a London court found him guilty of the main charge of fraud. The verdict was welcomed by London police.