Oki Matsumoto was born in 1963 and obtained his BA in Law from the University of Tokyo in 1987. He began his career at Salomon Brothers, joined Goldman Sachs in 1990 and became General Partner in 1994 at the age of 30, the youngest ever at that time. He took charge of trading, risk management, capital markets businesses in Asia, and also founded the special situations unit at Goldman Sachs. In 1999, he founded Monex which was jointly capitalized with Sony. Monex is listed on the 1st section of Tokyo Stock Exchange where he is presently Chairman & CEO.
Monex Group has grown to become a major online financial institution that operates retail online brokerages in Japan, US, China (including Hong Kong), and Australia. In addition, with the acquisition of Coincheck in April 2018, the crypto-asset business became one of the core pillars of the business segments. In January 2020, Monex established Japan Catalyst, an investment advisory arm, to pursue investment returns through proposals to and engagement with listed Japanese companies to stimulate Japanese capital markets. The group has about 1100 employees worldwide with over half of its staffs located in the United States and Costa Rica.
He served as Financial Counsel to the Prime Minister and also as outside directors of several companies including Tokyo Stock Exchange from June 2008 to 2013. He presently is an outside director of MasterCard, Incorporated and also a Vice Chair of Human Rights Watch.
Matsumoto served as Financial Counsel to the Prime Minister and, also as outside directors of several companies including the Tokyo Stock Exchange from June 2008 to 2013. He currently serves as an outside director of MasterCard, Incorporated and UZABASE Inc. He is also a councilor of the International House of Japan and a Vice Chair of Human Rights Watch.