| Abbreviation | Definition |
|---|---|
| ORAEW | ORA Electronics, Incorporated Warrants (de-listed) |
| ORAEZ | ORA Electronics, Inc. |
| ORAL | Orthalliance, Inc. |
| ORBK | Orbotech, LTD. |
| ORBT | Orbit International Corporation |
| ORCA | Orca Technologies, Inc. |
| ORCC | Online Resources and Communication Company |
| ORCC | Online Resources and Communication Company (de-listed) |
| ORCC | Online Resources and Communication Company (de-listed) |
| ORCL | Oracle Corporation |
| ORCT | Orckit Communications, LTD. |
| OREX | Isolyser Company, Inc. |
| ORFN | Orion Financial, LTD. |
| ORFR | Orbit/ France, Inc. |
| ORFR | Orbit/France, Incorporated (de-listed) |
| ORGK | Organik Technologies, Inc. |
| ORGKL | Organik Technologies, Inc. |
| ORGKZ | Organik Technologies, Inc. |
| ORGS | Organic Solutions, Inc. |
| ORIG | Ocean Rig UDW, Inc. |