| Warwick Test Supplies | Hampshire |
| Warwick Wireless Ltd | Leicestershire |
| Wasdell Group | |
| Wasp Barcode Technologies | |
| Watch-It Security Services Ltd | Nottinghamshire |
| Watchmycompetitor.com Ltd | |
| Water Research Centre Ltd | |
| Watercooling UK | Greater Manchester |
| Waterlogic Holdings Ltd | |
| Watermark Wealth Management | |
| Waters Creative Ltd | Swansea |
| Waterside Graphics | Hampshire |
| Waterstons Ltd | County Durham |
| Watkins Web Design | |
| Watson Digital | |
| Wattage Media Ltd | Merseyside |
| Wattle Solutions Ltd | Bristol |
| Wave Corrector | Buckinghamshire |
| Wave Design Ltd | East Sussex |
| Wave Optics Ltd | Oxfordshire |
| Wave Seven Creative Design | Northamptonshire |
| WaveBreak | |
| Wavehill IT | Greater London |
| Wavelenght Electronics Ltd | Kent |
| Wavelink Media | Edinburgh |
| Wavemaker | |
| WaveMetrix Ltd | |
| Wavenet Ltd | West Midlands |
| Wavepaths | |
| Way Up SEO | |
| Wayfresh | |
| Waymap Ltd | |
| Waymark Tech Ltd | Oxfordshire |
| Wayne Abraham | Greater London |
| Wayne Kerr Electronics | West Sussex |
| Waypoint Digital Marketing | |
| Wayve Technologies Ltd | |
| Wazobia Technologies | |
| Wazoku | |
| Wazoku Crowd | |
| WDR Ltd | West Sussex |
| We Are 778 Ltd | |
| We Are Digital | |
| We Are Digital Marketing | Swansea |
| We Are Londoners Ltd | Greater London |
| We Are Marketable | |
| We Are Open Co-op | |
| We are ROAST Ltd | |
| We Are Shard | Greater London |
| We Are Web Ltd | Merseyside |