| Abbreviation | Definition |
|---|---|
| OUSA | Omni U S A, Inc. |
| OUTB | Outback Oil & Mineral Exploration Corporation |
| OUTL | Outlook Group Corporation |
| OUTT | Out Takes, Inc. |
| OVBC | Ohio Valley Banc Corporation |
| OVIS | Olympus Ventures, Inc. |
| OVON | Optical Imaging Systems |
| OVRL | Overland Data, Inc. |
| OVVO | Ovvio Better Life, Inc. |
| OWCP | O W C Pharmaceutical Research Corporation |
| OWLD | OneWorld Systems, Inc. |
| OWOL | One World Online.com, Inc. |
| OWOS | Owosso Corporation |
| OWUV | One World Universe, Incorporated |
| OWVI | One World Ventures, Inc. |
| OWWI | Omega WorldWide, Inc. |
| OXBC | Oxford Bank Corporation |
| OXBM | Optex Biomedical, Inc. |
| OXBME | Optex Biomedical, Inc. |
| OXGN | Oxigene, Inc. |