| Abbreviation | Definition |
|---|---|
| RDRT | Read Rite Corporation |
| RDVA | Radva Corporation |
| RDWR | RadWare |
| REAL | Reliability, Inc. |
| REBC | Redwood Empire Bancorp |
| RECTE | Reflectix, Inc. |
| REDWE | Redwood Financial, Inc. |
| REFIE | Real Estate Fund Investment Trust |
| REFR | Research Frontiers, Inc. |
| REFR | Research Frontiers, Incorporated |
| REGI | Renaissance Worldwide, Inc. |
| REGI | Renewable Energy Group, Incorporated |
| REGN | Regeneron Pharmaceuticals, Inc. |
| REGN | Regeneron Phrmaceuticals, Inc. |
| REGN | Regeneron Phrmaceuticals, Incorporated |
| REGRF | REG Technologies Corporation |
| REGT | Regent Technologies, Incorporated |
| REGTE | Regent Technologies, Inc. |
| REHB | Rehabilicare, Inc. |
| REHB | Rehabilicare, Incorporated (de-listed) |