![Seiichiro Yamaguchi](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>)
Seiichiro Yamaguchi
President at
TOSEI CORPORATION
Net worth: 120 M $ as of 2026-09-29
Profile
Seiichiro Yamaguchi currently works at Tosei Corp., as Executive President & Representative Director from 2004.
Mr. Yamaguchi received his undergraduate degree in 1983 from Keio University.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
TOSEI CORPORATION 11.06% | 2025-11-29 | 10,786,262 ( 11.06% ) | 120 M $ | 2026-09-29 |
Seiichiro Yamaguchi active positions
| Companies | Position | Start |
|---|---|---|
| TOSEI CORPORATION | President | 1994-05-31 |
Education of Seiichiro Yamaguchi
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
74
1st degree connections
2
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 2 |
|---|---|
Keio University
 Keio University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Tosei Corp.
 Tosei Corp. Real Estate DevelopmentFinance Engages in sale and rental of commercial and residential properties | Finance |
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- Seiichiro Yamaguchi
