| Webvizion Global | |
| Webwax Ltd | Essex |
| WebWorksWell | |
| WebX Solution Ltd | Edinburgh |
| WebX Systems Ltd | Surrey |
| WebXel Ltd | Perth and Kinross |
| WEBxMedia Ltd | |
| webZeppelin | Surrey |
| Wecan Media | |
| WeCoach | |
| WeCodePlus | |
| Wectory Ltd | |
| WeDoSocial | |
| Weeweb | |
| WeGetDesign | |
| Weightman Digital | |
| Weird and Wonderful | |
| Weird Creations | East Sussex |
| Weird Juice Software | Fife |
| Weissman Ltd | |
| Wejo Ltd | |
| Welcom Software, LLP | North Yorkshire |
| Welcomm Communications Ltd | Leicestershire |
| Welford Media Ltd | West Yorkshire |
| Well Communications | Worcestershire |
| Well House Consultants Ltd | Wiltshire |
| Well Informed Ltd | |
| Wellbrook Communications | Powys |
| Wellcome Open Research | |
| Wellcome Trust | |
| WellData Ltd | Greater London |
| Wellington IT | Belfast |
| Wellola | |
| Wem Technology Ltd | Greater London |
| Wenalyze | |
| Wensum.net | Norfolk |
| Wentworth Computers Ltd | |
| WEP Clinical | |
| WePlay | |
| Weqas | |
| Wes McDermott | Greater Manchester |
| Wesh UK | Greater London |
| Wesl Datahub | |
| Wesley Coe (Cambridge) Ltd | |
| Wesrom Corporation | South Yorkshire |
| Wessex Institute | Hampshire |
| Wessex Internet | |
| Wessex IT Ltd | West Sussex |
| West Hill Capital, LLP | |
| West Midlands 5G | |