8. Kweku Adoboli (Loss: 2 billion)
Due to unauthorized trading, Adoboli was arrested under the suspicion of fraud. The case was considered at the time as the biggest ever happened at a Swiss bank and he pled not guilty for charges of false accounting and fraud. Adoboli used forward-setting ETF cash positions to disguise potential risks of his trades. He might use a glitch in the system where ETF transactions don’t require confirmations until settlement takes place. This allows payment to be sent before a transaction can be confirmed officially.