Bedrift U - Horten
- Ullrosa
- Ullrosa AS
- Unlimited
- Unik AS
- Unident AS
- Usbl Horten
- Unn Christensen
- Utvendig Drift AS
- Utdanningsforbundet Horten
- Ultrabody Holmestrand AS
- Undervisningshjelpen Joakim Halstensen
- Uno-X Lystlunden
- Undergnd Sound Roar Stabell
- Urban Flavours Therese Deste Thomassen
- Uslugi Remontowo-Budowlana Banaszak Slawomir
- United Wine, Beer & Spirits AS
- Undrumsdal Hyttegrend Kjell Anders Rød
- Ukrainsk og Russisk Tolk Oksana Chernevych