Although Nick Leeson is the best known rogue trader for the simple fact that he brought down Barings Bank, the U.K.'s oldest investment bank, he is not the trader with the biggest loses. In 1995, Mr. Leeson's three years of bad bets eventually reached £827 million ($1.4 billion).
Kweku Adoboli, a trader for UBS's exchange-traded funds desk, is accussed of racking up $2 billion in loses. Mr. Adoboli was arrested in London on Sept. 15, 2011.
Perhaps not widely known outside of Japan, Yasuo Hamanaka, a copper trader for Sumitomo Bank, lost $2.6 billion in 1996 while attempting to corner the market in copper.
Perhaps the best known rogue trader next to Nick Leeson is Societe Generale trader Jerome Kerviel, who lost a record setting €4.9 billion ($7.2 billion) on unauthorized stock-index futures bets in 2008.