| Tuld AS | Professional & scientific | 2020 |
| Tuld Management AS | Professional & scientific | 2024 |
| Tulugaq AS | | 2018 |
| Tuna Norway AS | Wholesale & retail | 2012 |
| Tunabygget AS | Real estate | 2002 |
| Tunebyte AS | | 2026 |
| Tunerbee AS | Information & communication | 2026 |
| Tunerstedt Bengt | | 2010 |
| Tungbilskolen AS | Education | 1986 |
| Turbotrykk AS | Professional & scientific | 2015 |
| Turf Care AS | Agriculture & fishing | 2021 |
| Tussebu Invest AS | Real estate | 2020 |
| Tuverud Mek AS | Manufacturing | 1996 |
| Tuvina AS | | 2025 |
| Tuyet Nail Studio AS | Other services | 2015 |
| TV4 Invest AS | Real estate | 2022 |
| Tvedestrand Brygge AS | Wholesale & retail | 2023 |
| Tveit Gruppen AS | | 2021 |
| Tverrveien 7 AS | Real estate | 2019 |
| Tvimenning AS | Information & communication | 2025 |
| Tværgade AS | | 2018 |
| Twe Engineering AS | Professional & scientific | 1996 |
| Twe Invest AS | Professional & scientific | 2005 |
| Tyrens Entreprenør AS | Real estate | 2024 |
| Tyri Lys Eiendom AS | Real estate | 2015 |
| Tyrilys AS | Manufacturing | 2018 |
| Tyris AS | Professional & scientific | 2026 |
| Tåkeheimen AS | Professional & scientific | 2019 |
| Tårnfaret 14 AS | Real estate | 2024 |
| Tårnkvartalet AS | Real estate | 2024 |
| Tømmerkrana 19 AS | Real estate | 1998 |
| Tømmerkrana 5 AS | Real estate | 2007 |
| Tømmersvingen III AS | Real estate | 2009 |
| Tømrer Terje D. Knutsen AS | Construction | 2013 |
| Tømrer Torres AS | Construction | 2020 |
| Tømrermester Moseng AS | Construction | 2021 |
| Tømrermester Solvang AS | Construction | 2011 |
| Tømrermester Sverre Hannevold AS | Construction | 1995 |
| Tømrermesterene Bogen Og Mathisen AS | Construction | 1984 |
| Tømrermesterne Enersen Og Sergeev AS | Construction | 2025 |
| Tømten AS | Arts & recreation | 2012 |
| U-Rock AS | Professional & scientific | 2016 |
| Uab Antonas Bygg Nuf | Construction | 2011 |
| Uc Holding AS | Financial services | 2005 |
| Ugulen Invest AS | Professional & scientific | 2020 |
| Ul Utvikling AS | Real estate | 2016 |
| Ulla Garn & Broderi AS | Wholesale & retail | 1995 |
| Uloba - Independent Living Norge SA | Health & social care | 1991 |
| Uloba AS | Health & social care | 2015 |
| Ulsmåg Holding AS | | 2022 |
| Ultima Ratio AS | Information & communication | 2025 |
| Ultimo AS | Professional & scientific | 1996 |
| Ultralydklinikken AS | Health & social care | 2007 |
| Ulvconsult AS | Professional & scientific | 2019 |
| Underground Golf Drammen AS | Arts & recreation | 2022 |
| Underhaugsveien 7 AS | Construction | 2019 |
| Ungdommens Hus SA | Real estate | 2025 |
| Unicon Holding Ans | | 1999 |
| Unifeeder Norway AS | Transport & logistics | 1985 |
| Unik Arkitekt AS | Professional & scientific | 2023 |
| Unik Bil AS | Wholesale & retail | 2018 |
| Union 5 Da | | 2016 |
| Union Brygge Eiendom AS | Real estate | 2025 |
| Union Brygge Holding AS | Real estate | 2024 |
| Union Eiendomsutvikling AS | Real estate | 1984 |
| Union Forsikring AS | Financial services | 2021 |
| Union Parkering AS | Real estate | 2004 |
| Union Pizza Drammen AS | Hospitality | 2016 |
| Union Restaurant Drift AS | Hospitality | 2022 |
| Union Restaurantdrift AS | Hospitality | 2025 |
| Union Sør AS | Real estate | 2014 |
| United Rentals AS | Administrative & support | 2024 |
| Univask AS | Other services | 2011 |
| Universal Exports AS | Wholesale & retail | 2003 |
| Universal Utvikling AS | Real estate | 1999 |
| Universal Utvikling Entreprise AS | | 2020 |
| Uobservert AS | | 2025 |
| Upstage AS | Arts & recreation | 2013 |
| Urban Auto AS | Wholesale & retail | 2023 |
| Urban Compact Living AS | Real estate | 2011 |
| Urban Exchange AS | Wholesale & retail | 2025 |
| Urbium Eiendom AS | Real estate | 2021 |
| Urmaker Knut Roll Hansen JR AS | Wholesale & retail | 1985 |
| Used Bike AS | Other services | 2024 |
| Uskap AS | Hospitality | 2023 |
| Utengen AS | | 2012 |
| Uthaug Holding AS | | 2025 |
| Utleie Av Eiendom AS | Real estate | 2019 |
| Utleiemegleren Drammen AS | Real estate | 2009 |
| Utvikling Og Profil AS | Real estate | 2013 |
| Vab AS | Professional & scientific | 2021 |
| Vaggelis Bygg Og Flis AS | Construction | 2019 |
| Vaillant Group Norge AS | Wholesale & retail | 1991 |
| Vajda Papir KFT | Professional & scientific | 2015 |
| Vajda-Papir Scandinavia AS | Manufacturing | 2013 |
| Valbrottveien 19 AS | Real estate | 2021 |
| Valids AS | Professional & scientific | 2015 |
| Valmueveien Capital AS | Financial services | 2018 |
| Valora Capital Partners AS | | 2025 |
| Vamos Smartin AS | Professional & scientific | 2016 |