UBS set a daily trading limit for the exchange traded funds desk of 100 billion US dollars (£61.5 billion) and also used hedging to reduce risk - for example buying one type of investment and simultaneously selling a similar one to mitigate any loss.
Prosecutors claim Adoboli failed to hedge several of his investments in order to make a bigger profit for the bank and larger bonus for himself.
At one stage Mr Adoboli was in danger of losing the bank nearly 12 billion US dollars (£7.4 billion) of unhedged investments.
More top news
Showers easing by midnight. Cold again, lows of 2C.
Climbers have been cut off from the mountain's base camp and remain on various routes leading to the top of the world's highest peak.
Rob Young has run more than a marathon a day for the last 12 months.