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Aoyama Sogo Accounting Firm Co. Ltd.
an independent member firm of PrimeGlobal

Board Members Board Members

Board Members


Kazuhiro Matsuzawa

Founding Partner / Representative Director and Chairman
Japan Certified Public Accountant / Certified Public Tax Accountant
AERS (Association for Real Estate Securitization) Certified Master
Born in 1967 in Matsuyama City, Ehime Prefecture

Kazuhiro Matsuzawa is the Co-Founder and Chairman of Aoyama Sogo Accounting Firm. Since co-founding the company in 1999, he has provided clients with SPC management of financial assets, real estate, and securitization in the field of structured finance. He has focused his efforts on growing the company’s domestic and global presence.
Prior to ASA, he worked at Deloitte Touche Tohmatsu LLC in audit and IPO support services.
He is a graduate of Meiji University, School of Commerce, and serves as a member of the Japan Association of Corporate Executives.

Notable Publications/Contributions

  • Understanding Accounting Department Functions through Illustrations. Revised edition (Joint author, Published January 2004, JMA Management Center)
  • Accounting News July 20, 2005 edition / No.1089 Trends and Analysis of Real Estate Securitization and related Tax and Accounting Issues (Chuokeizai-sha, Inc.)
Professional Career
March 1990
Graduated from Meiji University (School of Commerce)
October 1990
Passed Certified Public Accountant 2nd Examination (Issued provisional license)
Joined Deloitte Tohmatsu LLC (Total Services Group)
March 1994
Passed Certified Public Accountant 3rd Examination (Registered license #11936)
August 1999
Founded Aoyama Sogo Accounting Firm
April 2005
Founded Aoyama Sogo Tax Corporation (a separate entity for tax practice)
Became Representative Director
November 2013
Became CEO of ASA
October 2018
Became Chairman of ASA

Masaki Aguni

Founding Partner / Representative Director and Chief Executive Officer
Japan Certified Public Accountant / Certified Public Tax Accountant
AERS (Association for Real Estate Securitization) Certified Master
Born in 1970 in Naha City, Okinawa Prefecture

Masaki Aguni is the Co-Founder and CEO of Aoyama Sogo Accounting Firm. Since co-founding the company along with Kazuhiro in 1999, he has served domestic and overseas clients in structured finance and real estate. He oversees all operations.
Prior to ASA, he worked at Deloitte Touche Tohmatsu LLC in audit, IPO support, and system consulting services.
He is an adjunct professor at Showa Women’s University teaching accounting and finance in the Faculty of Global Business.

Notable Publications/Contributions

  • Understanding Financial Statement Accounts and Journal Entries (Joint author, Published 1999, JMA Management Center)
  • Accounting News July 1, 2004 / No.1054 / Securitization of Accounts Receivables in Fund-raising (Chuokeizai-sha, Inc.)
Professional Career
March 1993
Graduated from Keio University, Faculty of Law
October 1993
Passed Certified Public Accountant 2nd Examination (Issued Provisional license)
Joined Deloitte Tohmatsu LLC (Total Services Group)
April 1997
Passed the Certified Public Accountant 3rd Examination (Registered license# 13954)
August 1999
Founded Aoyama Sogo Accounting Firm
April 2005
Founded Aoyama Sogo Tax Corporation (a separate entity for tax practice)
Became Managing Director
July 2008
Became CEO of ASA Business Development K.K.
November 2013
Became Executive Vice President of ASA.
October 2018
Became CEO of ASA.

Tadahiro Sakamoto

Outside Director
Born in 1966, in Nara Prefecture

Tadahiro Sakamoto is an Outside Director for Aoyama Sogo Accounting Firm. He is also an independent consultant serving financial institutions in creating new business models, assisting organizational change and human resource development. He also provides comprehensive support services for owner managed companies.
Prior to ASA, he engaged in budget formulation and regulatory supervision with the Ministry of Finance and the Financial Services Agency.
He is a committee member of the MLIT (Ministry of Land, Infrastructure, Transport and Tourism) and METI (Ministry of Economy, Trade and Industry).

Notable Publications/Contributions

  • The Graceful Transformation of Financial Institutions ~ The Fall of the Pyramid-structured Organization, and the Birth of the Self-managed Organization (Joint author, Published December 2020, Kinzai Institute for Financial Affairs, Inc.)
  • Fiduciary Duty Workshop ~ Client-oriented Work style Reform in Financial Services (Joint author, Published April 2018, Kinzai Institute for Financial Affairs, Inc.)
Professional Career
March 1990
Graduated from the University of Tokyo
April 1990
Joined Ministry of Finance
June 1997
Deputy Director, Criminal Investigation Division, Securities and Exchange Surveillance Commission
July 2000
Deputy Accounting Officer, Budget Bureau, Ministry of Finance
July 2003
Deputy Director General, Insurance Division, Financial Services Agency
November 2005
Secretary to the Vice Minister of Finance
July 2006
Resigned from the Ministry of Finance
October 2007
Established Regional Co-Creation Network K.K. Became Representative Director (Current)
January 2016
Became Outside Director of Aoyama Sogo Accounting Firm

Jun Yoshioka

Corporate Officer
Certified Tax Accountant
AERS (Association for Real Estate Securitization) Certified Master
Born in Hyogo Prefecture

Jun Yoshioka is a Corporate Officer of Aoyama Sogo Accounting Firm. Since joining in 2010, he has provided tax and accounting consultation for real estate securitization SPCs during initial SPC formation and interim fund management. He has a high level of expertise in tax, accounting, finance, and real estate. He is in charge of the company’s growth strategy.

Toshihiko Hatta

Corporate Officer
Born in Nagano Prefecture

Toshihiko Hatta is a Corporate Officer of Aoyama Sogo Accounting Firm. Since joining in 2007, he has capitalized on his prior experience as an originator in the financial services industry, and is involved in all aspects of ASA’s financial asset securitization SPCs. He is in charge of promoting better work style practices.

Satoshi Yonekawa

Corporate Officer
Certified Social Insurance and Labor Consultant
Born in Hiroshima Prefecture

Satoshi Yonekawa is a Corporate Officer of Aoyama Sogo Accounting Firm. He joined in 2007 and oversees the entirety of Human Resources and General Affairs Group and the Strategic Planning department. He is in charge of the company’s strategic planning and human resources strategy.
Prior to ASA, he was involved in human resources, general affairs and accounting in the construction and retail industries.


Hirokazu Ando

Executive Manager
From Hokkaido Prefecture

Hirokazu Ando is an Executive Manager of Aoyama Sogo Accounting Firm. Since joining in 2008, he has provided interim management of real estate securitization SPCs. He is also responsible for opening our first regional office in Fukuoka. He is in charge of the company’s efficiency and Fintech promotion.
Prior to ASA, he was an accountant in the travel industry.

Jun Murata

Executive Manager
From Fukushima Prefecture

Jun Murata is an Executive Manager of Aoyama Sogo Accounting Firm. Since joining in 2016, he has served both corporations and individuals in tax compliance, accounting, tax audit support, and various management consulting services. He is charge of the company’s management strategy.
Prior to ASA, he worked in education and accounting.


Hirohide Sato

Corporate Auditor
Born in Tokyo

Hirohide Sato is the Corporate Auditor of Aoyama Sogo Accounting Firm. In 2016, he joined ASA as a managing member in charge of Strategic Planning and HR and General Affairs.
Prior to ASA, he spent 15 years at a U.S. real estate fund and a business investment fund and now invests in several companies of his own. In addition to consulting for SMEs, he serves as an executive of several companies.


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