| WIFIPLUG Ltd | |
| WigWag | |
| Wigwan Digital Ltd | Glasgow |
| WilconCooke | Greater Manchester |
| Wild Applications | Essex |
| Wild Dog Design | East Sussex |
| Wildanet Ltd | |
| Wildcard Networks | |
| Wildcat Applications Ltd | |
| Wildcat Creative Marketing | |
| Wildcat Solutions | Glasgow |
| Wildesoft.net | |
| Wildish & Co. Ltd | |
| WildPress Ltd | |
| Wildtalk Ltd | North Yorkshire |
| Wildwood Digital | |
| Wilkes Interactive | |
| Will Hall Online | |
| William Dean Consultancy Ltd | Berkshire |
| Williams Commerce | Leicestershire |
| Williamware.com | |
| Willo Technologies Ltd | |
| Willow Ridge Digital | |
| Willow Technology (Isle of Man) Ltd | |
| Wills Services | |
| Wilson Grey | |
| Wimborne Business Systems Ltd | Dorset |
| Win Media | |
| Winc Studio Ltd | |
| Wincanton's W2 Labs | |
| Winchester Web Works Ltd | |
| Winding Tree | |
| Windle Creative | |
| Windmill Software | Greater Manchester |
| Windrush Technology Ltd | Oxfordshire |
| Windsor Telecom plc | Surrey |
| Winfo Solutions | |
| Wing | |
| Wingpath Ltd | Hampshire |
| Winity | |
| WinMan ERP | West Midlands |
| Winnersh Triangle Web Solutions Ltd | Devon |
| Winnow Solutions Ltd | |
| WinPure | Berkshire |
| Winserve | Greater London |
| Winslow Adaptics Ltd | Powys |
| WinSpice | Cambridgeshire |
| Wintermute Trading Ltd | |
| Winterwell Associates Ltd | Edinburgh |
| Winton Group Ltd | |