![Ryotaro Sumi](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>)
Ryotaro Sumi
Director/Board Member at
Mitsui Water Holdings (Thailand) Ltd.
Net worth: - $ as of 31/07/2026
Profile
Ryotaro Sumi is currently Director at Mitsui Water Holdings (Thailand) Ltd. and Director at Mitsui & Co. (Asia Pacific) Pte Ltd. Formerly, Mr. Sumi was Director at TTW Public Co. Ltd. from 2012 to 2015 and Director at Repower Energy Development Corp.
Education includes undergraduate studies at Waseda University.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 07/07/2025 | 1 ( 0% ) | 0 $ | 31/07/2026 |
Ryotaro Sumi active positions
| Companies | Position | Start |
|---|---|---|
Mitsui Water Holdings (Thailand) Ltd.
 Mitsui Water Holdings (Thailand) Ltd. Financial ConglomeratesFinance Investment holding vehicle of Mitsui & Co Ltd | Director/Board Member | - |
Mitsui & Co. (Asia Pacific) Pte Ltd.
 Mitsui & Co. (Asia Pacific) Pte Ltd. Wholesale DistributorsDistribution Services Engages in product sales, logistics and financing activities | Director/Board Member | - |
Former positions of Ryotaro Sumi
| Companies | Position | End |
|---|---|---|
| TTW | Director/Board Member | 06/04/2015 |
| REPOWER ENERGY DEVELOPMENT CORPORATION | Director/Board Member | - |
Training of Ryotaro Sumi
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
24
1st degree connections
5
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 5 |
|---|---|
TTW Public Co. Ltd.
 TTW Public Co. Ltd. Water UtilitiesUtilities Engages in the processing and sale of tap water | Utilities |
Waseda University
 Waseda University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Mitsui Water Holdings (Thailand) Ltd.
Mitsui Water Holdings (Thailand) Ltd. Financial ConglomeratesFinance Investment holding vehicle of Mitsui & Co Ltd | Finance |
Mitsui & Co. (Asia Pacific) Pte Ltd.
Mitsui & Co. (Asia Pacific) Pte Ltd. Wholesale DistributorsDistribution Services Engages in product sales, logistics and financing activities | Distribution Services |
Repower Energy Development Corp.
 Repower Energy Development Corp. Alternative Power GenerationUtilities Generates and supplies hydroelectric power | Utilities |
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