| Abbreviation | Definition |
|---|---|
| OCIC | Overseas Cambodia Investment Corporation |
| OCIC | Overseas Cambodian Investment Corporation |
| OEIC | Open-Ended Investment Company |
| OEIM | Overseas Education Investment Management |
| OFDI | Office of Foreign Direct Investment |
| OFI | Opportunity Focus Investment |
| OGIF | Oil Gas Investment Fund |
| OGIS | Oil Gas Investment Symposium |
| OGIT | Oil and Gas Investment Trust |
| OH | Object Holder |
| OH | On Hold |
| OHLCV | Open, High, Low, Close, Volume |
| OI | Organisational Investment |
| OIAN | Online Investment Assurance Network |
| OIB | Oregon Investment Board |
| OIC | Oregon Investment Council |
| OICE | Olayan Investments Company Establishment |
| OIEO | Ontario Investment And Employee Ownership |
| OIEO | Ontario Investment Employee Ownership |
| OIF | Oman Investment Fund |