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About the company
Sumiseki Holdings Inc is a Japan-based holding company primarily engaged in the coal business. It operates through three segments. The Coal segment is engaged in related transactions related to the purchase and sale of coal. The New Materials segment is engaged in the manufacture, purchase and sale of industrial artificial diamonds. The Quarrying segment is engaged in the extraction, processing and sale of rocks.
- Revenue in JPY (TTM)8.80bn
- Net income in JPY3.24bn
- Incorporated2008
- Employees39.00
- LocationSumiseki Holdings Inc1-7-14, NishishimbashiMINATO-KU 105-0003JapanJPN
- Phone+81 355111400
- Websitehttps://www.sumiseki.co.jp/
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Mergers & acquisitions
| Acquired company | 1514:TYO since announced | Transaction value |
|---|---|---|
| Trustwell Co Ltd | 11.23% | -- |
Data delayed at least 15 minutes, as of Feb 10 2026 06:30 GMT.
