| Company name | Category |  | 
              
                | U-blox | Wireless communications |  | 
              
                | Ubicom | Design and development software |  | 
              
                | UDT Instruments | Opto and fibre test equipment |  | 
              
                | UDT Sensors | Optoelectronics |  | 
              
                | UK CAM | Design services |  | 
              
                | UK Displays and Lighting Network | Exhibitions, courses, conferences, training |  | 
              
                | UK Displays Network | Exhibitions, courses, conferences, training |  | 
              
                | UK Industrial Vision Association | Industry news |  | 
              
                | UK Tech Events | Industry news |  | 
              
                | UK Trade and Investment | Recruitment, reports, resources |  | 
              
                | Ulticom | Design and development software |  | 
              
                | Ultimate Renaissance | AC/DC power supplies |  | 
              
                | Ultra Electronics | Design services |  | 
              
                | Ultra Electronics Manufacturing Services | Electronics manufacturing services |  | 
              
                | Ultra Source | Boards and backplanes |  | 
              
                | Ultra Volt | AC/DC power supplies |  | 
              
                | Ultra-Crea | Antennas and feeders |  | 
              
                | Ultra-X | Board-level instruments |  | 
              
                | Ultracell | Batteries and chargers |  | 
              
                | Ultralife Batteries | Batteries and chargers |  | 
              
                | Ultrasonic Systems | PCB assembly equipment, tools |  | 
              
                | Ultraview | Sensors and data acquisition |  | 
              
                | Uninterruptible Power Supplies | UPSs |  | 
              
                | Unipower | AC/DC power supplies |  | 
              
                | Unique ICs | Design and development software |  | 
              
                | Unisem | Microprocessors, microcontrollers and DSPs |  | 
              
                | United Electronic Industries | Sensors and data acquisition |  | 
              
                | Unitemp | Test accessories |  | 
              
                | Universal Instruments | PCB assembly equipment, tools |  | 
              
                | Universal Powerline Association | Recruitment, reports, resources |  | 
              
                | Universal Science | Fans and blowers |  | 
              
                | University College London | Exhibitions, courses, conferences, training |  | 
              
                | University of Bath | Industry news |  | 
              
                | University of Cambridge | Recruitment, reports, resources |  | 
              
                | University of Derby | Exhibitions, courses, conferences, training |  | 
              
                | University of Glasgow | Exhibitions, courses, conferences, training |  | 
              
                | University of Missouri-Rolla | Exhibitions, courses, conferences, training |  | 
              
                | University of Oxford Electronics and Telecoms | Exhibitions, courses, conferences, training |  | 
              
                | University of Portsmouth | Exhibitions, courses, conferences, training |  | 
              
                | University of Southampton | Recruitment, reports, resources |  | 
              
                | University of Strathclyde | Exhibitions, courses, conferences, training |  | 
              
                | University of Surrey | Exhibitions, courses, conferences, training |  | 
              
                | University of Wales, Newport | Exhibitions, courses, conferences, training |  | 
              
                | UPS On Net | UPSs |  | 
              
                | US Microwaves | Transformers and inductors |  | 
              
                | USBID | Active components |  | 
              
                | Used-Line | ATE systems |  | 
              
                | UV Light Technology | Electronics manufacturing materials |  |