Firma U - Alnabru
- Utleieverktøy AS
- Utsiktgården AS
- Uproxo AS
- Utleiesenteret
- Uterom AS
- Ursus AS
- Unijon AS
- Ulvenlegene AS
- Uno Limited
- Ulriksen consulting
- Ullevålsveien 114 AS
- Us Ford AS
- UniformPartner Oslo
- Urban Slawomir
- Unicare omsorg AS
- UPS Norway AS
- Unicare hjemmetjenester AS
- Ullevål Malermesterforretning
- Ufo-Norge
- United food AS
- Ulven tannlegekontor
- Ulven borettslag
- Uph tjenester AS
- Ulvenlegene AS Tvangsavviklingsbo
- Ulvenlegene AS Tvangsavviklingsbo
- Ukbays consulting
- Ulven barnepark
- Ungdomstreffe klubb
- Ulven eiendom Holding AS
- Ulvenveien 88 i AS
- Ulven Bilforum Sadriu
- Ulvenveien utvikling AS (Oxer gruppen)
- UPS Norway AS avd Small Package
- Ulven bilpleie og vask AS
- Ulven frukt & tobakk Rolf Larsen