| UK Startup Jobs | |
| UK Tech Investment News | |
| UK Tech News | Greater London |
| UK Telecom Ltd | Surrey |
| UK Web.Solutions Direct Ltd | Greater Manchester |
| UK Webhosting Ltd | Berkshire |
| UK Website Workshop Ltd | Greater Manchester |
| UK Wholesale | Greater Manchester |
| UK's Unix & Open Systems User Group | Hertfordshire |
| UK-2 Ltd | Greater Manchester |
| UK-Ukraine TechBridge | |
| UK.COM | |
| Uk1 | Lancashire |
| UKDedicated Ltd | Hertfordshire |
| UKFast.Net Ltd | Greater Manchester |
| UKHost4u | Fife |
| UKIP | Lancashire |
| UKlinkology.co.uk | |
| UKLS Ltd | Cardiff |
| UKNetWeb Ltd | Cornwall |
| UKspace | |
| UKTV Media Ltd | |
| Uleska Ltd | |
| Ulster University | Belfast |
| Ultima Business Solutions Ltd | Berkshire |
| Ultimate Communication Software Ltd | |
| Ultimate Finance | |
| Ultimate Website Design | Essex |
| Ultimateweb Ltd | Leicestershire |
| Ultimedia Systems Ltd | Derbyshire |
| UltimVR | |
| Ultra Global | |
| Ultraleap | |
| UltraSoft Technologies Ltd | |
| Ultrasonic Sciences Ltd | Hampshire |
| Ultratec Ltd | Hertfordshire |
| Ultromics Ltd | |
| Umami | Merseyside |
| Umazi Ltd | |
| Umbrella Analytics Ltd | |
| Umlaut | |
| UMM Digital | Greater London |
| uMotif Ltd | |
| Unbound Innovations Ltd | |
| Unbranded Digital | West Yorkshire |
| Uncapped Ltd | |
| Uncrowd | |
| Under One Cloud | |
| Underscore | |
| Undo | Cambridgeshire |