| Abbreviation | Definition |
|---|---|
| OMX | Ormil Energy Limited |
| ONC | Oncard International Ltd |
| ONL | One North Entertainment Limited |
| ONQ | On Q Group Ltd |
| ONT | 1300 Smiles Ltd |
| ONT | 1300 Smiles, LTD. |
| OOH | Oohmedia Group Ltd |
| OOO | Betashares Crude Oil Index Etf-currency Hedged (synthetic) |
| OOO | Betashares Crude Oil Index Exchange Traded Fund-currency Hedged (synthetic) |
| ORC | Orchid Capital Ltd |
| ORCOA | Orchid Capital Ltd |
| ORD | Ord River Resources Ltd |
| ORE | Orocobre Ltd |
| ORG | Origin Energy Ltd |
| ORGHA | Origin Energy Limited |
| ORGKMB | Origin Energy Limited |
| ORGKMP | Origin Energy Limited |
| ORGKOB | Origin Energy Limited |
| ORGKOC | Origin Energy Limited |
| ORGKOP | Origin Energy Limited |