Sumitomo Corporation
Some of the largest unauthorized trading losses were discovered at Barings Bank (Nick Leeson), Daiwa Bank (Toshihide Iguchi), Sumitomo Corporation (Yasuo Hamanaka), Allfirst Bank (John Rusnak), Société Générale (Jérôme Kerviel), UBS (Kweku Adoboli), and JPMorgan Chase (Bruno Iksil).