![Kei 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>)
Kei Yamamoto
Chairman at
CHUOKEIZAI-SHA HOLDINGS, INC.
Net worth: 2 M $ as of 30/08/2026
Profile
Kei Yamamoto is currently the Chairman at Chuokeizai-Sha Holdings, Inc. since 2013.
He is also currently a Director at CKD KK since 2016, a Director at Planning Center KK since 2008, and a Representative Director at Triple A KK (Tokyo) since 2012.
Previously, he served as the Chairman at CO2, Inc.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 30/03/2026 | 254,000 ( 5.77% ) | 2 M $ | 30/08/2026 |
Kei Yamamoto active positions
| Companies | Position | Start |
|---|---|---|
| CHUOKEIZAI-SHA HOLDINGS, INC. | Chairman | 30/11/2009 |
Planning Center KK
 Planning Center KK Advertising/Marketing ServicesCommercial Services Provides advertising services | Director/Board Member | 31/10/2008 |
Triple A KK (Tokyo) | Director/Board Member | 31/10/2012 |
CKD KK | Director/Board Member | 31/12/2015 |
Former positions of Kei Yamamoto
| Companies | Position | End |
|---|---|---|
CO2, Inc.
 CO2, Inc. Publishing: Books/MagazinesConsumer Services Edits and publishes magazines, books, and other publications | Chairman | - |
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
7
1st degree connections
5
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 5 |
|---|---|
Chuokeizai-Sha Holdings, Inc.
 Chuokeizai-Sha Holdings, Inc. Publishing: Books/MagazinesConsumer Services Engages in the publication and sale of specialized books and magazines | Consumer Services |
CKD KK | |
Planning Center KK
Planning Center KK Advertising/Marketing ServicesCommercial Services Provides advertising services | Commercial Services |
CO2, Inc.
CO2, Inc. Publishing: Books/MagazinesConsumer Services Edits and publishes magazines, books, and other publications | Consumer Services |
Triple A KK (Tokyo) |
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