![Hiroichi Yokoyama](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>)
Hiroichi Yokoyama
Chairman at
Proto Data Center KK
Net worth: 22 M $ as of 2026-06-29
Profile
Mr. Hiroichi Yokoyama is a Chairman at Autoway Co., Ltd. and a Chairman at Proto Data Center KK.
Mr. Yokoyama was previously employed as a Chairman & President by Repair Tech, Inc., a Chairman by Proto (Shanghai) Advertisement Co., Ltd., a Chairman by MARS FLAG Corp., a Chairman by Proto Corp., a Chairman by Goo Auto Inc., and a Chairman by System-One Corp.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
TEAR Corp.
 TEAR Corp. Other Consumer ServicesConsumer Services Engages in the business of funeral services 34.62% | 2026-03-30 | 7,792,000 ( 34.62% ) | 22 M $ | 2026-06-29 |
Hiroichi Yokoyama active positions
| Companies | Position | Start |
|---|---|---|
Proto Data Center KK | Chairman | 2007-03-31 |
Autoway Co., Ltd.
 Autoway Co., Ltd. Specialty StoresRetail Trade Imports and sells tires and wheels | Chairman | 2020-03-31 |
Former positions of Hiroichi Yokoyama
| Companies | Position | End |
|---|---|---|
Proto (Shanghai) Advertisement Co., Ltd. | Chairman | - |
MARS FLAG Corp.
 MARS FLAG Corp. Information Technology ServicesTechnology Services Develops web search engine services | Chairman | - |
Repair Tech, Inc. | Chairman | - |
System-One Corp.
 System-One Corp. Packaged SoftwareTechnology Services Develops and wholesales software | Chairman | - |
Goo Auto Inc. | Chairman | - |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
3
1st degree connections
8
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 8 |
|---|---|
Proto Corp.
 Proto Corp. Internet Software/ServicesTechnology Services Operates as an online auction platform for automobile market | Technology Services |
MARS FLAG Corp.
MARS FLAG Corp. Information Technology ServicesTechnology Services Develops web search engine services | Technology Services |
System-One Corp.
System-One Corp. Packaged SoftwareTechnology Services Develops and wholesales software | Technology Services |
Autoway Co., Ltd.
Autoway Co., Ltd. Specialty StoresRetail Trade Imports and sells tires and wheels | Retail Trade |
Proto Data Center KK | |
Repair Tech, Inc. | |
Goo Auto Inc. | |
Proto (Shanghai) Advertisement Co., Ltd. |
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