![Tomoyasu Kosaka](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>)
Tomoyasu Kosaka
President at
TOHO SYSTEM SCIENCE CO., LTD.
Net worth: 1 M $ as of 30/06/2026
Profile
Tomoyasu Kosaka has held a position at Toho System Science Co., Ltd. since 1989 and has been Executive President & Representative Director there since 2018.
Since 2026, Mr. Kosaka has also been Chairman at Toranvia Co., Ltd. Current jobs include Chairman at Toranvia Co., Ltd. and Executive President & Representative Director at Toho System Science Co., Ltd.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
0.51% | 26/12/2025 | 2,03,629 ( 0.51% ) | 1 M $ | 30/06/2026 |
Tomoyasu Kosaka active positions
| Companies | Position | Start |
|---|---|---|
| TOHO SYSTEM SCIENCE CO., LTD. | President | 01/04/2018 |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
11
1st degree connections
1
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 1 |
|---|---|
Toho System Science Co., Ltd.
 Toho System Science Co., Ltd. Information Technology ServicesTechnology Services Operates as a software development company | Technology Services |
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- Tomoyasu Kosaka
