| U F Norløff AS | Oslo | 1997 |
| U.S. Bank Europe Designated Activity Company Nuf | Oslo | 2007 |
| Ubiquitus AS | Sandnes | 2005 |
| Uc Holding AS | Drammen | 2005 |
| Udjus Invest AS | Oslo | 2018 |
| Udnes Holding AS | Årnes | 2018 |
| Ueland Shipping AS | Bryne | 1998 |
| Ues Invest AS | Oslo | 2020 |
| Ugb Holding AS | Asker | 2008 |
| Ugla 1000 AS | Oslo | 2012 |
| Uglebu AS | Oslo | 2006 |
| Uji AS | Vihals | 2010 |
| Ulakollen Invest AS | Nesøya | 2005 |
| Ulf a. Aspaas Invest AS | Langesund | 2005 |
| Ulf Rasmussen Consulting AS | Indre Arna | 2005 |
| Ulf Søgård AS | Lørenskog | 2005 |
| Ulke AS | Bergen | 2007 |
| Ull Capital AS | Stavanger | 2007 |
| Ullensaker Utvikling AS | Gardermoen | 2015 |
| Ulsrud Invest AS | Enebakkneset | 2014 |
| Ulstabakkjin AS | Molde | 2017 |
| Ulstein Capital AS | Ulsteinvik | 2015 |
| Ulve Invest AS | Skallestad | 2005 |
| Ulvefoss AS | Oslo | 2005 |
| Ulveseth Holding AS | Fjell | 2005 |
| Ulvund AS | Evanger | 2005 |
| Um Holding AS | Oslo | 2005 |
| Umbriel AS | Bergen | 2008 |
| Undefined AS | Gjettum | 2016 |
| Under Puta AS | Lillehammer | 2005 |
| Under-Holding AS | Skatval | 2015 |
| Underbakka Holding AS | Ølen | 2005 |
| Underbakka Invest AS | Ølen | 2015 |
| Underskrudd Holding AS | Hvam | 2015 |
| Unga AS | Oslo | 2005 |
| Ungemoen AS | Halsanaustan | 2018 |
| Uni Micro Holding Ansatt AS | Modalen | 2021 |
| Uniflora AS | Kongsvinger | 2016 |
| Unihever AS | Sandnes | 2018 |
| Unik Invest AS | Sandnes | 2018 |
| Unikvist AS | Bergen | 2015 |
| Union Core 30 AS | Oslo | 2021 |
| Union Core Real Estate Fund AS | Oslo | 2015 |
| Union Eiendomskapital Uref AS | Oslo | 2011 |
| Union Forsikring AS | Drammen | 2021 |
| Union Forvaltning AS | Oslo | 2015 |
| Union Investeringsselskap II AS | Oslo | 2017 |
| Union Investeringsselskap III AS | Oslo | 2018 |
| Union Investeringsselskap IV AS | Oslo | 2018 |
| Union Investeringsselskap Urd AS | Oslo | 2023 |
| Union Investeringsselskap V AS | Oslo | 2018 |
| Union Mountain Holding AS | Oslo | 2013 |
| Union Real Estate Credit I AS | Oslo | 2023 |
| Union Real Estate Fund II Holding AS | Oslo | 2015 |
| Union Real Estate Fund III Holding AS | Oslo | 2018 |
| Union Real Estate Fund V Holding AS | Oslo | 2023 |
| Union Residential Development AS | Oslo | 2022 |
| Union Residential Development II AS | Oslo | 2023 |
| Union Residential Gro AS | Oslo | 2023 |
| Unione AS | Holmestrand | 2017 |
| Unique AS | Oslo | 2002 |
| Unit Forsikring AS | Tiller | 2011 |
| Unitel AS | Oslo | 2005 |
| Universalis AS | Stavanger | 2016 |
| Uno Finans AS | Oslo | 2018 |
| Uno Holding AS | Sola | 2005 |
| Uno Sætheråsen Invest AS | Kongsvinger | 2013 |
| Up Invest AS | Oslo | 2018 |
| Upgar Invest AS | Tromsø | 2017 |
| Upheims Fremadstormende Kapitalister AS | Torpo | 2017 |
| Ura Holding AS | Innfjorden | 2005 |
| Ura Invest AS | Vågstranda | 2017 |
| Urban Cowboy AS | Tananger | 2018 |
| Urder Invest AS | Sandefjord | 2016 |
| Uref V Co-Invest I AS | Oslo | 2018 |
| Uref V Co-Invest II AS | Oslo | 2018 |
| Urem Real Estate Fund I AS | Oslo | 2019 |
| Urem Real Estate Fund I Invest AS | Oslo | 2019 |
| Urem Real Estate Fund II AS | Oslo | 2021 |
| Urias AS | Oslo | 2005 |
| Uroa Ventures AS | Stabekk | 2013 |
| Ursidae Holding AS | Skodje | 2017 |
| Ursin-Holm AS | Oslo | 2016 |
| Urskog AS | Aurskog | 2015 |
| Ursus Real Estate Management AS | Oslo | 2019 |
| Ursusrem Atlas AS | Oslo | 2019 |
| Urter Invest AS | Haugesund | 2006 |
| Urunda Invest AS | Oslo | 2005 |
| Urundberget Holding AS | Paradis | 2023 |
| Urzus Holding AS | Bergen | 2020 |
| Ush AS | Oslo | 2005 |
| Ustetind AS | Oslo | 2005 |
| Ut Invest AS | Voss | 2013 |
| Uthavn Holding AS | Larvik | 2014 |
| Utigard.Eckey AS | Oslo | 2005 |
| Utility Capital AS | Kleppestø | 2006 |
| Utn AS | Oslo | 2005 |
| Utsikt 1 AS | Bønes | 2009 |
| Utsikt Invest AS | Tønsberg | 2005 |
| Utsikten Holding AS | Sundebru | 2005 |