| Company Logo | Company name | Country | Sector |
|---|---|---|---|
 | Ohmi Press Works & Forging Co., Ltd. |  Japan | Manufacturing |
 | Okabe | Japan | Manufacturing |
 | OHISHI SANGYO CO., LTD. | Japan | Others |
 | OAT Agrio Co., Ltd. | Japan | Manufacturing, Manufacturing |
 | Ogaki Kyoritsu Bank, LTD. | Japan | Finance |
 | Onward Holdings Co., Ltd. | Japan | Others |
 | Okada Aiyon Corporation | Japan | Manufacturing |
 | ORASCOM |  Egypt | Construction |
 | Oil International Services |  Mexico | Energy |
 | ONHYM (Office National des Hydrocarbures et des Mines) |  Morocco | Chemicals |
 | Oman CMA |  Oman | Finance |
 | Open University Malaysia (OUM) |  Malaysia | Education |
