Chairman of the Board

Oki Matsumoto

Oki Matsumoto became General Partner of Goldman Sachs 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.

Monex Group is a major online financial institution that operates retail online brokerages in Japan and the US. 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.

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

- Non-Executive Director, 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 (to be appointed as President,  Member of the Board, and Executive Director in January 2024). 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 & CEO 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. After serving as a Director, Executive Officer and Chief Financial Officer of Monex Group, Inc. from April 2023, he has been a Director and Executive Officer since June 2026.

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

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

- Chairman of the Board, 3iQ Digital Holdings Inc. (the Company's subsidiary)

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

Member of the Board 

Naofumi Yamada

Naofumi Yamada joined Socidea Intellectual Property Office in June 2011. He co-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 was appointed a Director of the Company in June 2021, and served as a Director and Executive Officer from April 2022. He has been a Director since June 2026.

- Patent Attorney, Socidea Intellectual Property Office

Independent Director,

Member of the Board

Nobuo Domae

(Lead Independent Director)　

He joined McKinsey & Co., Inc. (Japan) in April 1993. In September 1998, he joined FAST RETAILING CO., LTD., where he served as Director from November 1998, Director and Senior Vice President from July 1999, Director and Executive Vice President from November 2004, Director from November 2005, and Executive Vice President from November 2008. Subsequently, he served as President of FAST RETAILING FRANCE S.A.S. from December 2008 and as CEO of FAST RETAILING USA, Inc. from August 2010. He was appointed Director of DeNA Co., Ltd. in June 2016. He joined Ryohin Keikaku Co., Ltd. as Senior Executive Officer in February 2019, becoming Senior Managing Director in May 2019, and President & Representative Director in September 2021. Nov. 2024 Appointed Chairperson and Member of the Board of Directors, Ryohin Keikaku Co., Ltd. He has served as a Member of the Board of the Company since June 2016.

None

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.

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.; Apr. 2023 Producer, Osaka-Kansai World Expo Women’s Pavilion WA; Apr. 2023 Part-time Lecturer, Ochanomizu University (current position) . 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 CEO and Representative Director, ARC Therapies Inc., Operating Partner, ARCHIMED Group, External Auditor, Hepalys Pharma, Inc.; Feb. 2024 External Board Director, SPERA PHARMA, Inc.; Apr. 2024 Managing Director, ARCHIMED Group. She has been a Member of the Board of the Company since June 2024.

-CEO and Representative Director, ARC Therapies 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.; Apr. 2026, Senior Vice President in charge of Wellbeing Business, Sompo Holdings, Inc. and President and Representative Director, Sompo Health Support, Inc. She has been a director of the Company since June 2024.

- President and Representative Director, Sompo Health Support Inc.
- Senior Vice President in charge of Wellbeing Business, SOMPO Holdings, Inc. 

Independent Director,

Member of the Board

Takayuki Sawano

Takayuki Sawano joined Daiwa Securities Co., Ltd. (currently Daiwa Securities Group Inc.) in April 1986. He was appointed Head of Investor Relations at Daiwa Securities Group Inc., Tokyo in June 2008. By April 2011, he had become President of Daiwa Capital Markets America Holdings Inc.,New York. In April 2016, he took on the roles of Executive Managing Director and Head of the Americas at Daiwa Securities Group Inc., as well as Chairman and CEO of Daiwa Capital Markets America Holdings Inc.,New York. In April 2020, he was named Representative Director and Deputy President Executive Officer at Sumitomo Mitsui DS Asset Management Company, Ltd. Since July 2024, he has been serving as Advisor to NIPPON KANZAI Holdings Co., Ltd., and he has been a Director of the Company since June 2025.

None

Independent Director,

Member of the Board

Masashi Namatame

Masashi Namatame joined The Long-Term Credit Bank of Japan, Limited (currently SBI Shinsei Bank, Limited) in Apr. 1988. He served as Director of Investment Banking Department of Deutsche Securities Limited (currently Deutsche Securities Inc.) from Jan. 2000, Executive Director of Morgan Stanley Japan Limited (currently Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.) from Aug. 2004, Managing Director of Investment Banking Division of Deutsche Securities Inc. from Nov. 2007, and Member of the Board of Directors, Managing Director of BlackRock Japan Co., Ltd. from Sep. 2015. He then became Executive Officer and General Manager of Digital Strategy Dept. of Tokio Marine Holdings, Inc. in Apr. 2020, Managing Executive Officer, Group CDO (Chief Digital Officer) of Tokio Marine Holdings, Inc. in Apr. 2021, Outside Director of Bolttech Holdings Limited in May 2023, and Senior Managing Executive Officer, Group CDO (Chief Digital Officer) of Tokio Marine Holdings, Inc. in Apr. 2024.
He has been Senior Managing Executive Officer, Meiji Yasuda Life Insurance Company since May 2026 (current position) .
He has a Member of the Board of the Company since June 2026.

- Senior Managing Executive Officer, Meiji Yasuda Life Insurance Company