スピリドン・メンザス / Spyridon Mentzas

Spyridon Mentzas

Founder / CEO

Spyro began his career as a programmer at Salomon Brothers, Asia in 1995 where he launched the global program trading desk for equities. In 2007, he partnered with Mizuho Securities as a consultant overseeing the firm’s success in algorithmic and high frequency trading. In 2010 he was appointed Co-Head of Equities and Deputy Global Head of Pan Asian Equities for Mizuho. In 2016, he joined the principal investment department expanding into the FinTech ecosystem, running due diligence and valuation modeling of venture capital firms and startups globally and connecting them to various institutional investors, mainly in Japan. In 2017, he founded HiJoJo Partners.

Spyro graduated Columbia University with a degree in Engineering & Management Systems.

濱田 智彦 / Tomohiko Hamada

Tomohiko Hamada

Co-Founder / Managing Executive Officer

Tomohiko joined Salomon Brothers, Asia in 1991 as an arbitrage trader in Equity Derivatives. He then worked to develop, promote and implement a global program trading system for them. In 2000, at Credit Suisse First Boston, he joined the Global Portfolio Trading Group as Head of Japan and was responsible for rolling out new trading systems and developing new business with institutional investors. He is a pioneer in algorithmic trading, dark pool venues and advanced trading strategies. He has been a consultant at Simplex Inc. since 2011. He co-founded HiJoJo Partners in 2017.

Tomohiko graduated Chuo University with a degree in Law.

杉浦 英和 / Hidekazu Sugiura

Hidekazu Sugiura

Co-Founder / Managing Executive Officer

Hidekazu began his career at Fujitsu in 1997 in international sales and subsequently transferred to the Systems Development department designing back office systems for securities firms. In 2003, he joined CLSA and was responsible for leading the firm’s adoption of new equity trading systems. In 2005 he joined Simplex Inc. as project manager and successfully led large scale projects including the advancement of equity trading systems for top-tier securities firms and the development of the Osaka Securities Exchange OSE-FX Exchange Trading System. In 2016, he launched Japan’s first inter-broker dark pool solution. He joined HiJoJo Partners in June 2018 as a founding member.

Hidekazu graduated Aoyama Gakuin University with a degree in International Politics, Economics & Communication.

Norifumi Akiyama

Norifumi Akiyama

Managing Executive Officer

After graduating from the University of Tokyo with a degree in Law, he joined the Industrial Bank of Japan in 1990 and Mizuho Securities in 2000. He has 22 years of investment banking business experience, including 10 years overseas in London and Hong Kong.  He became the President of Mizuho Securities Asia (Hong Kong) in 2016, Executive Officer of the Syndication Division and Head of Global Syndication at Mizuho Securities in 2018.  From 2019, as Executive officer of Principal Investment, he oversaw domestic and international PE/VC fund investments.  He has served as Chairman of the Board of Directors of Mizuho Principal Investment, Director of Mobile Internet Capital and Director of Mizuho-Leaguer Investment.

Throughout his 32 years in banking and securities, he has a wide range of business and management experience, including overseas operations, markets, capital markets, banking, investment management, research and planning.  His strength lies in developing new business through his insight, personal network and leadership.

He joined HiJoJo Partners in August 2022 as Managing Executive Officer, and was appointed as Director in January 2023.

山澤 光太郎

Kotaro Yamazawa

External Board member

Kotaro joined the Bank of Japan in 1980 and was later appointed Manager of Personnel Division for the Corporate Affairs Department, ultimately being appointed the Head of a subsidiary branch of the Bank of Japan.  From 2006, he was seconded to the Osaka Securities Exchange as a senior executive officer. In 2013 Kotaro became a Senior executive officer of Japan Exchange followed by a role as director of the Osaka Exchange in 2015. He currently holds positions as a board member and at AEON Financial Services as an external auditor as well as various advisory roles at established Japanese corporations.​

Kotaro graduated University of Tokyo with a Law degree.