| SVP.co.uk | Clackmannanshire |
| Swaisland Ltd | Berkshire |
| SwallowGames | Norfolk |
| SwankyApple Ltd | Devon |
| Swanley Computers | Kent |
| Swansea ITeC | Swansea |
| Swansea University | Swansea |
| Swansea University - Computer Science Department | Swansea |
| Swansea University - Mathematics Department | Swansea |
| Swansoft Ltd | Channel Islands |
| Swap Commerce Ltd | |
| Swapi Ltd | |
| Swarm Oncology | |
| SWE | |
| Sweans Technologies Ltd | |
| Sweet Apple Technical Support | Wiltshire |
| Sweet Chilli Media | Cornwall |
| Sweet Marketing | |
| Sweetbridge EMEA Ltd | |
| Sweetbridge Ltd | |
| Sweethaven Computers | Surrey |
| Swift Digital Solutions | Greater London |
| Swift Internet | |
| Swift IT | Buckinghamshire |
| Swift IT Computer Services | |
| SwiftTec | Somerset |
| Swifty | |
| Swiipr Technologies | |
| Swindon Design & Development Ltd | Wiltshire |
| Swipe & Tap | |
| Swipii | |
| Swirrl IT Ltd | Greater Manchester |
| Switch Computer Support | Devon |
| Switch Creative Ltd | |
| Switch Energy & Telecoms | |
| Switchnet Systems Ltd | |
| Swof Media, LLP | |
| Swot Digital Ltd | |
| SWS Broadband | Shropshire |
| Swype Creative | |
| Swytch Mobile Ltd | |
| SX Marketing Ltd | |
| Sy Brand | |
| SY Electronics | Greater Manchester |
| Sybaris Ltd | |
| Sycos AES | Dorset |
| Sycous | West Yorkshire |
| Syedain & Co. | |
| Sygem Software | Berkshire |
| Sygnature Discovery Ltd | |