| Abbreviation | Definition |
|---|---|
| OMED | Oxboro Medical International, Inc. |
| OMEF | Omega Financial Corporation |
| OMEG | Omega Dynamics, Inc. |
| OMEGQ | Omega Environmental, Inc. |
| OMGA | Omega Research, Inc. |
| OMGD | Omnigene Diagnostics, Inc. |
| OMHI | O M A P Holdings, Inc. |
| OMKT | Open Market, Inc. |
| OMNI | O M N I Energy Service Corporation |
| OMNI | OMNI Energy Service Corporation (de-listed) |
| OMNI | OMNI Energy Service Corporation (de-listed) |
| OMNS | Omnis Technology Corporation |
| OMNT | Omni Nutraceuticals, Inc. |
| OMQP | Omniquip International, Inc. |
| OMTL | Omtool, LTD. |
| ONCO | On Command Corporation |
| ONCO | Oncology Med, Incorporated |
| ONCOW | On Command Corporation Warrants |
| ONCOW | On Command Corporation Warrants (de-listed) |
| ONCOW | On Command Corporation Warrants (de-listed) |