| Rimrock Computer Company | Montana |
| Rimsys | Pennsylvania |
| RINA Systems | Ohio |
| Rinard Media | |
| Rincon Research Corporation | Arizona |
| Rincon Venture Partners | California |
| RINDEV | Colorado |
| Ring Over | Georgia |
| Ring Ring Marketing | |
| Ring Therapeutics | |
| Ring-Zero Software, Inc. | Texas |
| Ring4 | California |
| Ringable, Inc. | |
| RingByName | Florida |
| RingCaptcha | California |
| RingCentral, Inc. | California |
| RingDNA | California |
| Ringling College of Art and Design | Florida |
| RingMD | |
| Ringobon, LLC | Virginia |
| Rinse, Inc. | |
| Rinth, Inc. | |
| Rio Rancho Websites | New Mexico |
| Rio Salado College | Arizona |
| Rio Software, LLC | Maine |
| Rio Verde Wireless, LLC | Arizona |
| Rio X Marketing, Inc. | |
| Riology I.T. Solutions, LLC | Texas |
| RION | Minnesota |
| Riordan, Lewis & Haden Equity Partners | California |
| Riot | California |
| Riot Games, Inc. | California |
| Riot Ventures | |
| Riot Ventures | |
| Riot, Inc. | Illinois |
| Riparian Pharmaceuticals, Inc. | |
| Ripco Communications | Illinois |
| Ripcord Design | Massachusetts |
| Ripcord Digital, Inc. | |
| Ripcord, Inc. | |
| RIPE | Delaware |
| Ripe Apps, Inc. | |
| Ripe Hub, Inc. | California |
| Ripe Media | |
| Ripon College | Wisconsin |
| Ripon Technology, LLC | Wisconsin |
| Rippey AI | Colorado |
| Ripple | California |
| Ripple Marketing | |
| Ripple Training, Inc. | Arizona |