![Reijiro Yamamoto](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Reijiro Yamamoto
Director/Board Member at
INTEGRAL GROUP CORPORATION
Net worth: 179 M $ as of 2026-09-29
Profile
Mr. Reijiro Yamamoto is an Independent Outside Director at Aderans Co., Ltd., a Representative Director & Partner at Integral Partners Corp /Private Equity/, a Representative Director & Partner at Integral Group Corp.
and a Managing Director at MCo Corp.
He is on the Board of Directors at Jsee Holdings Co., Ltd., M&I Corp, Neutral Co., Ltd. (Aichi), Sanden Retail Systems Corp., Toyo Engineering Corp., Aderans Co., Ltd., Itokin Co., Ltd., Yohji Yamamoto, Inc., Integral Partners Corp /Private Equity/, Integral Group Corp.
and MCo Corp.
Mr. Yamamoto was previously employed as a Chairman by Skymark Airlines, Inc., a Managing Director by GCA Corp.
(Japan), a Head-Mergers & Acquisitions Department by Sakura Bank Ltd., and a Managing Director by GCA Savvian Corp.
/Old/.
He also served on the board at Mamezo Co., Ltd., Openstream Holdings Co., Ltd. and BPS Corp.
(Japan).
He received his undergraduate degree from the University of Hitotsubashi, a graduate degree from Joseph H Lauder Institute of Management & International and an MBA from The Wharton School of the University of Pennsylvania.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2025-12-30 | 9,737,000 ( 27.84% ) | 179 M $ | 2026-09-29 |
Reijiro Yamamoto active positions
| Companies | Position | Start |
|---|---|---|
| ADERANS CO LTD | Director/Board Member | 2016-12-31 |
| TOYO ENGINEERING CORPORATION | Director/Board Member | 2019-02-28 |
| MAMEZOU HOLDINGS CO.,LTD. | Director/Board Member | 2020-05-31 |
| INTEGRAL GROUP CORPORATION | Director/Board Member | 2006-01-11 |
INTEGRAL CORP / Private Equity
 INTEGRAL CORP / Private Equity Investment ManagersFinance Integral Partners invests in companies located in Japan. The firm focuses on a broad range of sectors and industries. It participates in buyout capital requirements. | Director/Board Member | 2011-02-20 |
Jsee Holdings Co., Ltd. | Director/Board Member | 2020-05-31 |
MCo Corp.
 MCo Corp. Investment ManagersFinance Acts as an alternative investment manager | Director/Board Member | 2011-02-20 |
Itokin Co., Ltd.
 Itokin Co., Ltd. Apparel/Footwear RetailRetail Trade Retails men's and women's clothing | Director/Board Member | 2016-01-31 |
Sanden Retail Systems Corp.
 Sanden Retail Systems Corp. Industrial MachineryProducer Manufacturing Manufactures and sells freezing and refrigeration showcases for commercial use and vending machines for beverage and food sale | Director/Board Member | 2019-09-30 |
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Former positions of Reijiro Yamamoto
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Education of Reijiro Yamamoto
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
68
1st degree connections
21
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 21 |
|---|---|
Aderans Co., Ltd.
 Aderans Co., Ltd. Other Consumer ServicesConsumer Services Provides hair, beauty and health care services | Consumer Services |
Toyo Engineering Corp.
 Toyo Engineering Corp. Oilfield Services/EquipmentIndustrial Services Provides engineering services | Industrial Services |
Skymark Airlines, Inc.
 Skymark Airlines, Inc. AirlinesTransportation Provides domestic air transportation services | Transportation |
Sakura Bank Ltd.
 Sakura Bank Ltd. Major BanksFinance Provides commercial banking services | Finance |
Mamezou K2TOP Holdings Corp.
 Mamezou K2TOP Holdings Corp. Information Technology ServicesTechnology Services Provides information technology system development and consulting services | Technology Services |
University of Hitotsubashi
 University of Hitotsubashi Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
GCA Corp. (Japan)
 GCA Corp. (Japan) Investment Banks/BrokersFinance Provides M&A investment banking and related financial advisory services | Finance |
GCA Savvian Corp. /Old/
 GCA Savvian Corp. /Old/ Investment ManagersFinance Provides M&A advisory services | Finance |
Itokin Co., Ltd.
Itokin Co., Ltd. Apparel/Footwear RetailRetail Trade Retails men's and women's clothing | Retail Trade |
INTEGRAL CORP / Private Equity
INTEGRAL CORP / Private Equity Investment ManagersFinance Integral Partners invests in companies located in Japan. The firm focuses on a broad range of sectors and industries. It participates in buyout capital requirements. | Finance |
MCo Corp.
MCo Corp. Investment ManagersFinance Acts as an alternative investment manager | Finance |
Yohji Yamamoto, Inc.
 Yohji Yamamoto, Inc. Apparel/FootwearConsumer Non-Durables Designs and sells men's and women's apparel | Consumer Non-Durables |
Joseph H Lauder Institute of Management & International
 Joseph H Lauder Institute of Management & International Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
BPS Corp. (Japan)
 BPS Corp. (Japan) Industrial MachineryProducer Manufacturing Engages in assembling and selling sealing machines and peripheral equipment | Producer Manufacturing |
The Wharton School of the University of Pennsylvania
 The Wharton School of the University of Pennsylvania Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Sanden Retail Systems Corp.
Sanden Retail Systems Corp. Industrial MachineryProducer Manufacturing Manufactures and sells freezing and refrigeration showcases for commercial use and vending machines for beverage and food sale | Producer Manufacturing |
Neutral Co., Ltd.
 Neutral Co., Ltd. Information Technology ServicesTechnology Services Provides system development and data engineering services | Technology Services |
Mamezo Digital Holdings Co., Ltd.
 Mamezo Digital Holdings Co., Ltd. Data Processing ServicesTechnology Services Provides cloud, digital technology and data services & develops control systems and devices | Technology Services |
Jsee Holdings Co., Ltd. | |
Openstream Holdings Co., Ltd.
 Openstream Holdings Co., Ltd. Information Technology ServicesTechnology Services Operates as a system integrator and web marketing consulting company | Technology Services |
Integral Corp.
 Integral Corp. Investment ManagersFinance Provides equity investment services | Finance |
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