| Rethink Networks | South Carolina |
| Rethink Robotics, Inc. | |
| RethinkCX | |
| RethinkDB | California |
| Rethinking Consulting Services, LLC | |
| Retia Medical Systems, Inc. | New York |
| Retina AI, Inc. | California |
| Retina Labs USA, Inc. | Tennessee |
| Retina Research Foundation | |
| Retina-AI Health, Inc. | |
| Retina-X Studios, LLC | Florida |
| RetinalGeniX | California |
| RetiNova Therapeutics, Inc. | |
| Retire-IT, LLC | Ohio |
| RetiVue, LLC | Virginia |
| Retool | |
| Retool, Inc. | California |
| Retractable Technologies, Inc. | Texas |
| Retrain.ai | New York |
| Retreaver, Inc. | |
| Retrieval Systems Corporation | Virginia |
| Retriever Medical, Inc. | |
| RetrieverTechnology, L.P. | New Mexico |
| Retrium | Maryland |
| Retro Biosciences | |
| Retro Biosciences, Inc. | California |
| Retro Studios | Texas |
| Retrocausal | Washington |
| RetroCube | |
| RetroFit Technologies | Massachusetts |
| Retrogen, Inc. | California |
| Retronix | Texas |
| RetroRate | |
| Retrospect, Inc. | California |
| Retrotope, Inc. | California |
| RetroVirox, Inc. | California |
| Return Infinity, Inc. | |
| Returnalyze, Inc. | |
| Returnly Technologies, Inc. | California |
| RETV Management LLC | Utah |
| Reunion Marketing | |
| Reunion Neuroscience, Inc. | |
| Reuters | |
| REUZEit | California |
| REV | Louisiana |
| Rev | Texas |
| Rev.io | Georgia |
| Rev.Net Technologies, Inc. | Virginia |
| REV365 Digital Marketing | Arkansas |
| Rev7 | |