| Abbreviation | Definition |
|---|---|
| ReFaC | Regulatory Facilitation Company |
| REG | Regal Entertainment Group |
| REGI | Raptor Education Group Inc |
| REGI | Raptor Education Group Inc. |
| REGI | Renewable Energy Group Inc |
| REHC | Renal Electrolyte & Hypertension Consultants |
| REI | Engineering Inc |
| REI | Reaction Engineering International |
| REI | Recreational Equipment Inc |
| REI | Recreational Equipment, Inc. |
| REI | Recreational Equipment, Incorporated |
| REI | Rochester Electronics, Inc. |
| REI | Rochester Electronics, Incorporated |
| REIL | Rajasthan Electronics Instruments, Ltd. |
| REK | Rekonize Sports |
| REL | Radio Engineering Laboratories |
| REL | Research Enterprise Limited |
| REL | Research Enterprise Limited Quebec |
| REL | Resource Equipment Ltd |
| REM | Resources Electronic Marketplace |