| Rhodes Pharmaceuticals, L.P. | |
| Rhombus | |
| Rhombuz | California |
| Rhombuzz, LLC | New York |
| RHS Telecom | Illinois |
| RHT SpectraSafe | |
| Rhumbix | California |
| Rhycom Advertising | |
| Rhyme | |
| Rhythm Express | Minnesota |
| Rhythm Pharmaceuticals, Inc. | |
| Rhythmedix | New Jersey |
| RhythmOne, LLC | California |
| RI Web Design | Rhode Island |
| Ri-Theshah-Ar | |
| RiaEnjolie, Inc. | New Jersey |
| Rialey AI | |
| Rialtes | |
| RIB Americas | Georgia |
| Ribbitz, LLC | |
| Ribbon Communications Operating Company, Inc. | Massachusetts |
| Ribbon Rail Productions | Illinois |
| Ribbons Unlimited | Maryland |
| Ribit | Texas |
| Ribometrix | North Carolina |
| RiboNova, Inc. | |
| Riboscience, LLC | California |
| Ribose Group, Inc. | |
| Ric Taylor Sales, LLC | Illinois |
| Rice Alliance of Rice University | Texas |
| Rice University Bioscience Research Collaborative | Texas |
| Rice University Curricular Linux Environment | Texas |
| Rice University Department of Computational Applied Mathematics and Operations Research | Texas |
| Rice University Department of Computer Science | Texas |
| Rice University Department of Mathematics | Texas |
| Rice University Quantum Initiative | Texas |
| Rich Marketing | Washington |
| Rich MultiMedia Design | |
| Rich's Web Design | North Carolina |
| Richard Bland College of William & Marry | Virginia |
| Richard Carlton Consulting, Inc. | California |
| Richard Hill Web Design | Maine |
| Richard Peoples Ventures, LLC | |
| Richardson Marketing | |
| RichestSoft | |
| Richey Capacitor, Inc. | Tennessee |
| Richi Entrepreneurs | Massachusetts |
| RichMob | |
| Richmond Geeks | Virginia |
| Richmond Global Ventures | New York |