| Runtech Group Ltd | |
| Runtime (UK) Ltd | Shropshire |
| Runway East | |
| Rural Internet | |
| Rush Computers | |
| Rush PCB Ltd | Surrey |
| Rush Solutions | |
| Ruskin College Oxford | |
| Russ Andrews | Cumbria |
| Russell | Tyne and Wear |
| Ruvca Consulting | |
| RVS Media Ltd | |
| RW Badland Ltd | West Midlands |
| RWAP Software | Staffordshire |
| RWD | |
| RWS Holdings plc | |
| RxBiologics | |
| Rxbiologics | |
| RxCelerate | |
| Ryan Cornelius Design Ltd | |
| Ryco Marketing | Belfast |
| Rycom (UK) Ltd | Surrey |
| Rycombe Consulting | East Sussex |
| Rydal Communications Ltd | Cambridgeshire |
| Ryde | |
| Ryedale Linux User Group | North Yorkshire |
| Ryft | |
| Ryft Pay | |
| Ryland Consulting Ltd | Greater London |
| Ryland Technology Ltd | Buckinghamshire |
| Ryne AI | |
| Ryse Energy | |
| S & J Designs | |
| S B Systems | Essex |
| S P Web Design | |
| S Software Ltd | |
| S Square Solutions | |
| S-digital Ltd | Buckinghamshire |
| S.B.G. Computers | East Sussex |
| S.C. Consultants | Hampshire |
| S.E.C. Solutions Ltd | Worcestershire |
| S.H. Enterprises | Devon |
| S.P.C. Computers Ltd | Devon |
| S2 Computers | |
| S2S Solutions | South Yorkshire |
| S2T | |
| S3 Satcom Ltd | Essex |
| S4H Ltd | |
| S8080 | Swansea |
| SA Systems | |