Marcus Wallenberg is since 2005 the Chairman of Skandinaviska Enskilda Banken (SEB), a North European financial group for 400,000 corporate customers, and 5 million private customers. SEB has local presence in the Nordic and Baltic countries and Germany.

Marcus Wallenberg is also the Chairman LKAB, Saab and Electrolux, and serves on the boards of AstraZeneca, Stora Enso, the Knut and Alice Wallenberg Foundation and Temasek Holdings.

Marcus Wallenberg held the position as Chairman and Honorary Chairman of ICC (International Chamber of Commerce) from 2006 to July 2010. From 1999 to 2005, Mr Wallenberg was President and CEO of Investor AB, after having served as Executive Vice-President of the company for six years. Prior to this he was Director of Stora Feldmühle in Düsseldorf for three years.

Marcus Wallenberg earned a B. Sc of Foreign Service from Georgetown University in Washington, D.C. and began his career at Citibank in New York 1980, followed by various positions at Deutsche Bank in Germany, S G Warburg Co Ltd in London and Citicorp in Hong Kong.