| Ron Sonntag Public Relation | |
| Ron Turley Associates, Inc. | Arizona |
| Ronan Dowling | Minnesota |
| Ronawk, Inc. | Kansas |
| Ronco | New York |
| Rondo Energy, Inc. | |
| Rondo Therapeutics | |
| Ronkot Design, LLC | |
| Ronsystems, Inc. | California |
| Roo Productions | Arizona |
| Rooam | California |
| Roof Ai | |
| Roofing Webmasters | |
| RoofLogic, Inc. | Texas |
| RoofManager | North Carolina |
| Roofr | |
| Roofstock, Inc. | |
| Roojoom | Massachusetts |
| Rookout | California |
| Room 214, Inc. | Colorado |
| Room 34 Creative Services, LLC | |
| Room Choice | |
| Room Choice, Inc. | Idaho |
| Roomvu Technologies, Inc. | |
| Rooney Design | California |
| Roonyx, Inc. | |
| Roos Instruments, Inc. | California |
| Roosevelt University | Illinois |
| Roosted | |
| Rooster Park Software Development | Washington |
| Rooster Teeth Productions, LLC | |
| RoosterBio, Inc. | Maryland |
| RoosterGrin Media, LLC | |
| Root | California |
| Root Capital, Inc. | |
| Root Creative | Colorado |
| Root Level Services, LLC | Wisconsin |
| Root Seven Technologies, Inc. | Massachusetts |
| Root802 | |
| Rooted Consulting | Louisiana |
| Rooted Insight, LLC | |
| Rooted Software | |
| RootFi, Inc. | Illinois |
| Rootless Agency | |
| Rootly | California |
| RootPath, Inc. | Massachusetts |
| Roots Automation | New York |
| RootsMagic, Inc. | Utah |
| Rootstack | Texas |
| Rootstock Software | California |