Firma U - Gamlebyen
- Utdanningsdirektoratet
- Unibuss AS
- Upcoming Da
- Uniheis AS
- Utdanningsdirektoratets Bedriftsidrettslag
- Udir Itd
- Udir Itd
- Ullevålsveien 13 AS
- Urban group AS
- Utvikling.Org AS
- Unibuss Ekspress AS
- Unibuss Tur AS
- Urban Gravity AS
- Uhnger invest AS
- UIP Holding AS
- Ullernchausseen 68b/71 AS
- Ulsrud eiendom AS
- Utama Corp
- Urtehagen barnehager AS
- Umaro Djalo
- Unite Living AS
- Uglebakken multiservice
- USBL eiendom AS
- USBL Utleieboliger AS
- University Of Lapland
- Uni-Tel Norge AS
- Unibuss Tur AS avd Oslo
- Utdanningsdirektoratet avd hovedkontor Oslo
- UIP Oslo Lehus AS
- UIP Trondheim Bysykkel AS
- Utheim Brown kompetanse
- UIP Construction Management AS
- UIP Customer Experience AS
- Uno Alexander Vesje
- Utvikling.org Oslo - Bjørvika
- Ullkilden Anne Lise Nordhagen
- Unicorn bakeri Hakan Akgül
- Universitetet i Oslo Tennis
- Universitetet i Oslo Tennis
- Ulsletten Hans Christian Hystad
- Uri.B Ignacio Uribe Ortega
- Uglebakken Anna Margareta Karinsdotter Janvald
- Urban Cellar prosjekt & invest AS
- Unik mat varer Raad Kays Atia