Firma U - St. Hanshaugen
- Utleieformidleren
- Utleiekollektivet AS
- Uniservice AS
- Uriburu AS
- Underdog AS
- Utgard AS
- Ulvestad Holding AS
- Unparallel nordic AS
- Utleiespesialisten (Slipemaskiner)
- Uranienborg Utleietelefon
- Ubade Alhassan
- Urbana Fasade AS
- USBL eiendom AS
- Unni Winther AS
- ULTRA Adventure AS
- Uphill Productions AS
- Unn Buer
- Ubumwe Family
- Ubumwe Family
- Uten Oppskrift AS
- Unni Rykhus
- Ullevålsveien Arte Pazza avd.
- Uncertain States scandinavia DA
- Unn Deg Noni AS
- Udnes Anne Kristine
- Umer Ahmed design
- Unicorn Information Systems AS
- Uelandsgate 24 borettslag
- United Stage Productions AS
- Upnorth film Oslo AS
- Uro V/Guro Hoftun Gjestad
- Una line Ree Hunderi
- Ubon Tradisjonell Thai Massage
- Ullevålsveien Storkiosk Jawad Kazem Mahdi
- Ullevålsveien Storkiosk Jawad Kazem Mahdi
- Umbrella ATM solutions Mika Juhani Taipalus