Chairman of the Board

Oki Matsumoto

Oki Matsumoto became General Partner in 1994 at the age of 30, the youngest ever at that time. He took charge of trading, risk management in Asia, and also founded the special situations unit. In 1999, he founded Monex which was jointly capitalized with Sony. Monex is listed on Prime Market of the Tokyo Stock Exchange where he is presently Chairman of the Board & Representative Executive Officer.

Monex Group is a major online financial institution that operates retail online brokerages in Japan, US, China (including Hong Kong), and Australia. Monex acquired Coincheck in 2018, and the crypto-asset business became one of the core pillars of the business segments. In 2020, Monex established Japan Catalyst, an investment advisory arm, to pursue investment returns through engagement with listed companies to stimulate Japanese capital markets. 

He served as Economic Council Member and also as outside directors of several companies

including Tokyo Stock Exchange from June 2008 to 2013. He was a Vice Chair of Human Rights Watch, and currently is an outside director of Mastercard Incorporated.

- Chairman of the Board of Directors, TradeStation Group, Inc. (the Company’s wholly owned subsidiary)

- Executive director with the title Executive Chairman, Coincheck Group N.V.(the Company's subsidiary)

- Managing Director, Coincheck, Inc.  (the Company’s subsidiary)

- Chairman & Managing Director, Japan Catalyst, Inc.(the Company’s wholly owned subsidiary)

- Chairman of the Board of Directors, Docomo Monex Holdings, Inc.（our affiliated companies）

- Outside Director, Mastercard Incorporated

Member of the Board

Yuko Seimei

Yuko Seimei started her career at the Sanwa Bank, Ltd. (currently MUFG Bank, Ltd.) in April 2001. She moved to MKS Partners Ltd in December 2006. She joined Monex Hambrecht, Inc. in February 2009 (merged with Monex, Inc. in 2017) and became Representative Director of Monex Hambrecht, Inc. in June 2011. She became Executive Director of Monex Group, Inc. in March 2013, Executive Officer of Monex Group, Inc. in June 2016, and the Representative Director and President of Monex, Inc.in April 2019. She was appointed Representative Executive Officer and Chief Operating Officer of Monex Group, Inc. in January 2020 and Representative Executive Officer, Chief Operating Officer and Chief Financial Officer of Monex Group, Inc. in January 2021.In June 2021, she was appointed to Member of the Board of  Monex Group, Inc. and in April 2022, she was appointed to a Member of the Board, Representative Executive Officer, Co-Chief Executive Officer and Chief Financial Officer of Monex Group, Inc. Since June 2023, she has served as a Member of the Board, Representative

Executive Officer, Chief Executive Officer of Monex Group,Inc.

- Member of the Board of Directors, TradeStation Group, Inc. (the Company’s wholly owned subsidiary)

- Member of the Board, Docomo Monex Holdings, Inc.（our affiliated companies）

- President, Member of the Board, Executive Director, Monex, Inc.（our affiliated companies）

Member of the Board

Takashi Oyagi

Takashi Oyagi started his career at the Bank of Japan in April 1991. After receiving an MBA from the University of Chicago’s Graduate School of Business, he joined Goldman Sachs (Japan) Ltd. In April 1999, he joined (the former) Monex, Inc. as one of the four founding members. Oyagi joined Deutsche Bank Securities, Inc. in New York in May 2004.
 

In August 2007, he became CEO and President of MBH America, Inc., the Company’s U.S. subsidiary, upon its establishment. He was appointed Executive Director of the Company in July 2009 and implemented business developments in Beijing and Hong Kong. He  became a Member of the Board of Directors in June 2011.In June 2013, he was appointed a Director and Executive Officer. Since April 2023, he has been a Director and Executive Officer and Chief Financial Officer of Monex Group, Inc. 

- Director and CSO, TradeStation Group, Inc. (the Company’s wholly owned subsidiary)

- Non-executive director, Coincheck Group N.V.(the Company's subsidiary)

- Managing Director,  Monex Asset Management, Inc. 

- Chairman of the Board, 3iQ Digital Holdings Inc.  

Member of the Board 

Naofumi Yamada

Naofumi Yamada joined Socidea Intellectual Property Office in June 2011. He founded AppReSearch Inc. (Currently PKSHA Technology Inc.) in October 2012 and became its Representative Director. He became Director and Chief Technology Officer of PKSHA Technology Inc. in June 2016, Director of BEDORE Inc. (Currently PKSHA Workplace Inc.)  in October 2016 and Representative Director of PKSHA xOps Inc. in September 2019. He assumed his current position at the Company in June 2021.

- Patent Attorney, Socidea Intellectual Property Office

Independent Director,

Member of the Board 
(Lead Independent Director)　

Jun Makihara

Jun Makihara joined Goldman Sachs Co., Ltd. in September 1981 and was named a General Partner of Goldman Sachs & Co. in December 1992. He was Co-Head of Investment Banking of its Tokyo Branch, and then became the Co-Branch Manager and Co-Head of Equity Business at the same before he was nominated as Chairman of Neoteny Co., Ltd. in July 2000. Makihara assumed his current position at the Company in June 2006.

- Director, TradeStation Group, Inc. (the Company’s wholly owned subsidiary)  

   (Outside Director in substance)

Independent Director,

Member of the Board

Nobuo Domae
 

Nobuo Domae joined McKinsey & Co., Inc. (Japan) in April 1993. After joining FAST RETAILING CO., LTD. in September 1998, he was named Director and Executive Vice President in November 2004, and then Executive Vice President in November 2008. He also assumed positions of President of FAST RETAILING FRANCE S.A.S. and CEO of FAST RETAILING USA, Inc. He assumed his current position as Director of the Company in June 2016.

- Chairperson, Member of the Board of Directors, Ryohin Keikaku Co., Ltd.

Independent Director,

Member of the Board

Masaaki Koizumi

Masaaki Koizumi has been registered as Certified Public Accountant since August 1991.  He established KOIZUMI C.P.A. OFFICE  in October 2003.  He was appointed as Director of the Company in June 2018.

- Certified Public Accountant , KOIZUMI C.P.A. OFFICE

- Outside Director, Fan Communications, Inc.

- Statutory Auditor, TSUKUI CAPITAL CORPORATION

Independent Director,

Member of the Board

Ungyong Shu

Ungyong Shu joined  Morgan Guaranty Trust Company of New York, a subsidiary of J.P. Morgan & Company, Inc. in April 1986. May 2001 Managing Director, J.P. Morgan Securities; July 2010 Co-Head of Investment Banking Division, Merrill Lynch Japan Securities Ltd; July 2011 Vice Chairman; Representative Director, Core Value Management, Co., Ltd. since November 2013. He has been a director of the Company since June 2022.
 

- Representative Director, Core Value Management, Co., Ltd.

- Outside Director, Sojitz Corporation

Independent Director,

Member of the Board

Sachiko Habu

Sachiko Habu joined Editorial Engineering Laboratory Co., Ltd. in April 2002. Apr. 2012 Deputy Editor-in-chief, Nikkei MONEY; Nov. 2013 Founder and Editor-in-chief, Nikkei DUAL; Apr. 2018 Editor-in-chief, Nikkei ecomom; Feb. 2019 Editor-in-chief, Nikkei ARIA; Aug. 2019 Editor-in-chief, Nikkei xwoman, Editor, Nikkei doors; Jun. 2022 CEO, HABU Production CO., LTD.. She has been a director of the Company since June 2024.

- CEO, HABU Production CO., LTD.

Independent Director,

Member of the Board

Rami Suzuki

Rami Suzuki was Head, Life Science Venture Capital Fund, ITX Corporation. in Jan. 2001. Oct. 2016  Corporate Officer, Business Development, Eisai Co., Ltd.; Oct. 2020  CEO and Representative Director, Ferring Pharmaceuticals Co., Ltd.; Nov. 2021  President and Representative Director, Moderna Japan Co., Ltd.; Jan. 2024 Operating Partner, ARCHIMED Group, Auditor, Hepalys Pharma, Inc.; Feb. 2024 Outside Director, SPERA PHARMA, Inc.; Feb. 2024 Managing Director, ARCHIMED Group. She has been a director of the Company since June 2024.

-CEO and Representative Director, ARC Therapies Inc. 
-Managing Director, ARCHIMED Group 
-Auditor, Hepalys Pharma, Inc. 
-Outside Director, SPERA PHARMA, Inc. 

Independent Director,

Member of the Board

Ryoko Shimokawa

Ryoko Shimokawa joined Goldman Sachs Japan Co., Ltd. in April 1994.Jul. 2016 Senior Deputy GM, Corporate Planning Dept., SOMPO Himawari Life Insurance Inc.; Apr. 2020 Executive Officer, SOMPO Himawari Life Insurance Inc. and GM of Healthcare Business Development Dept., SOMPO Holdings, Inc.; Aug. 2021 Group Chief Sustainability Officer, Senior Vice President and Executive Officer, SOMPO Holdings, Inc. She has been a director of the Company since June 2024.

-Group Chief Sustainability Officer, Senior Vice President and Executive Officer, SOMPO Holdings, Inc.