| Company Code | Company Name | Details |
|---|---|---|
| Saishunkan Co., Ltd. | Chemicals | Non-listed | Kumamoto | Official Site | |
| Kumamoto Prefectural Government | 地方自治体 | Non-listed | Kumamoto | Official Site | |
| Higo Bank | Banks | Non-listed | Kumamoto | Official Site | |
| SYSKEN Corp. | Construction | Non-listed | Kumamoto | Official Site |