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- Ultralife
- UNBRANDED
- UNIGEN
- Unigen Corp
- Unistrut
- United Automation
- UNITED CHEMICON
- Unspecified
- US Relays and Technology, Inc.
- US Sensor
- Usag
- US-Lasers Inc
- UNICOM GLOBAL SYSTEMS SOLUTIONS
- UNI-LITE INTERNATIONAL
- U.S. Toyo Fan
- Ubon
- ULTIMATE SUPPORT
- ULTRALAST GREEN
- Uniohm
- Unit safety signs
- Unitrode Semiconductor
- UTICA
- Utilux