| Abbreviation | Definition |
|---|---|
| OBT | Obtala Res. |
| OCDO | Ocado |
| OCG | Oxford Cat. |
| OCH | Orchid Dev |
| OCL | Oakley |
| OCN | Ocean Wilsons |
| OCP | Orch.chem.s |
| OCPA | Orchid Chemicals and Pharmaceuticals, LTD. |
| ODX | Omega Dia |
| OEC1 | Octopus Ecl. |
| OEC2 | Octopus Ecl.2 |
| OEC3 | Octopus Ecl.3 |
| OEC4 | Octopus Ecl.4 |
| OEM | Oem |
| OEX | Oilex |
| OFF | Office2off. |
| OGDC | Oil&gas Regs |
| OGK2 | Jsc Ogk-2 S |
| OGN | Origin |
| OGT | Quorum Oil &Gas |