| Abbreviation | Definition |
|---|---|
| OLY | Olympic Cascade Financial |
| OMFG | Official Meeting Facilities Guide |
| ONT | ON2 COM Technologies, Inc. |
| ONX | ONIX Systems, Inc. |
| OOC | O E C Compression Corporation |
| OPC | Q C Optics, Inc. |
| OPG | Merrill Lynch & Company, Inc. |
| OPI | Opinion Research Corporation |
| OPT | Opticare Health Systems, Inc. |
| OQG | Optimal Robotics Corporation |
| ORG | Organogenesis, Incorporated |
| OSE | Osage Systems Group, Inc. |
| OSH | Oshmans Sporting Goods, Inc. |
| OTR | Otr Express Inc |
| OVH | Overhill Corporation |
| PAB | PAB Bankshares, Inc. - de-listed |
| PAE | Peace Arch Entertainment Group, Inc. |
| PAX | Paxson Communications Corporation |
| PCC | P M C Commercial Trust |
| PCGPA | Pacific Gas and Electric Company Preferred A |