| Wire Apps Ltd | |
| Wirebox | |
| Wired Media Ltd | Bristol |
| Wired Sussex | East Sussex |
| Wired UK | |
| Wired2Fire Ltd | Surrey |
| WiredVibe Ltd | |
| Wirefox | |
| WireITFree | Hampshire |
| Wireless CCTV Ltd | Greater Manchester |
| Wireless Federation | |
| Wireless Infrastructure Group | |
| Wireless Logic Ltd | Berkshire |
| Wireless Terminal Solutions | Greater London |
| Wirestaff Ltd | |
| Wirral Met College | |
| Wirtech Ltd | |
| Wisdom Works Group | |
| Wise Marketing | Greater London |
| Wise Owl Business Solutions Ltd | Derbyshire |
| Wiser Websites | |
| WiserWeb | |
| Wish Agency Ltd | |
| Wish Software Studio | |
| Wishew | |
| WiSS | Gwynedd |
| WIT Fitness | |
| With Intelligence | |
| With Juno Ltd | |
| Withinweb | |
| Wivro | |
| Wixhill | |
| Wizard IT | Greater London |
| Wizard Online Solutions Ltd | |
| Wizard Systems UK | Bristol |
| Wizbit Internet Services | Hampshire |
| Wizdom.ai | |
| Wizlemon Studio | |
| Wizmark Computers | Cardiff |
| WizPip Ltd | Dorset |
| WizziWeb.com | Greater Manchester |
| WNCreative | |
| WNW Digital | Devon |
| Wobble Genomics | |
| Wodehouse Direct Ltd | |
| Wolf Logic | |
| Wolfberry Media | |
| Wolfclub Digital | |
| Wollop Software Solutions Ltd | West Yorkshire |
| Wolverhampton Linux Users Group | West Midlands |