| Russell Reynolds Associates | New York |
| Russell Sage College | New York |
| Russell Tobin | |
| RussellCraft Multimedia | California |
| RusSte, Inc. | Wisconsin |
| Rust College Division of Science and Mathematics | Mississippi |
| Rustbelt Creative | |
| Rustemsoft, LLC | Wisconsin |
| Rustic Canyon Partners | California |
| Rustici Software, LLC | Tennessee |
| Rustmedia | |
| Rusty George Creative | Washington |
| RustyBrick, Inc. | New York |
| RustyRazorblade Consulting | |
| Rutgers University | New Jersey |
| Rutgers, The State University of New Jersey Center for Discrete Mathematics and Theoritical Computer Science | New Jersey |
| Rutgers, The State University of New Jersey Department of Computer Science | New Jersey |
| Rutgers, The State University of New Jersey Department of Electrical and Computer Engineering | New Jersey |
| Rutgers, The State University of New Jersey Department of Mathemartics | New Jersey |
| Rutgers, The State University of New Jersey NetSCI Lab | New Jersey |
| Rutgers, The State University of New Jersey WINLAB | New Jersey |
| Rutgers-New Brunswick Department of Mathematics | New Jersey |
| Ruth Technology Corporation | Arizona |
| Ruthless Spine | |
| Rutter | |
| Rutter Networking Technologies | Massachusetts |
| Ruut | California |
| Ruzuku, Inc. | |
| RV Chat | Florida |
| RV Communications, Inc. | Florida |
| RVB Systems Group | North Carolina |
| RVS Software, Inc. | Texas |
| RW Stearns, Inc. | California |
| RW Ventures, LLC | Illinois |
| RW3 Ventures | |
| RWaltz | |
| RWaltz Software | Georgia |
| Rwazi, Inc. | California |
| Rwazi, Inc. | |
| RWDC Industries | |
| RWL Consulting | Ohio |
| RWTech.com | California |
| RxBio, Inc. | |
| RxDataScience, Inc. | North Carolina |
| RxDispense | Texas |
| RxE2, Inc. | |
| RxE2, Inc. | |
| RxFunction, Inc. | Minnesota |
| RxKinetics | Missouri |
| RxLogix | |