| Trollhaugen Barnehage AS | Education | 2007 |
| Trollhaugen Barnehage Holding AS | Education | 2017 |
| Trollkode AS | Information & communication | 2017 |
| Trollkyrkja AS | | 2015 |
| Trolltegn AS | Information & communication | 2013 |
| Trollvatn AS | Professional & scientific | 2021 |
| Trolo Reklame & Agentur AS | Professional & scientific | 2012 |
| Trond E. Madsen Eiendom AS | Real estate | 2021 |
| Trondheim Livssynshumanistiske Ungdomsskole AS | Education | 2025 |
| Truto AS | Financial services | 2005 |
| Trygg Invest AS | | 2021 |
| Trygg Personell Da | Administrative & support | 2011 |
| Tryggestad Eiendom Og Finans AS | Real estate | 1999 |
| Tryggestad Elegante AS | Real estate | 2006 |
| Tryggestad Elegante II AS | Real estate | 2007 |
| Tryggestad Trafikkskole AS | Education | 2012 |
| Trygstad Holding AS | Real estate | 2005 |
| Trygstad Invest AS | | 2015 |
| Trykkluftservice AS | Manufacturing | 1995 |
| Trykkmann R Bergmann & Co Ans | Wholesale & retail | 1974 |
| Træen Holding AS | | 2023 |
| Trøndelag Engros AS | Wholesale & retail | 2015 |
| Tse Holding AS | Financial services | 2017 |
| Tse Tech Invest AS | | 2025 |
| Tte AS | Real estate | 1991 |
| Tte Consult AS | Professional & scientific | 2023 |
| Tufjordbruket AS | Manufacturing | 2006 |
| Turistbussen Ålesund AS | Transport & logistics | 2009 |
| Turrhaugen Invest AS | | 2022 |
| Tustna Tømmervågvegen AS | Real estate | 2021 |
| Tvedt Impact AS | Real estate | 2018 |
| Tverrvegen 30 B AS | Real estate | 2014 |
| Tverrvegen 32 C AS | Real estate | 2014 |
| Tverrvegen 32A AS | Real estate | 1989 |
| Tverrvegen 32B AS | Real estate | 2021 |
| Tverrvegen 36 AS | Real estate | 2019 |
| Tverrvegen 38 AS | Real estate | 2018 |
| Tveten Marin AS | Professional & scientific | 2009 |
| Tyfi Holding AS | Financial services | 2005 |
| Tynes Invest AS | Information & communication | 2021 |
| Tyo Automation Ålesund AS | Manufacturing | 2006 |
| Tyrholm & Farstad AS | Transport & logistics | 1968 |
| Tyso AS | Financial services | 2017 |
| Tyst Invest AS | Financial services | 2012 |
| Tyt Invest AS | | 2021 |
| TZ Invest AS | | 2025 |
| Tårnet NO.9 AS | Real estate | 2025 |
| Tømmerdal Consult AS | Professional & scientific | 2007 |
| Tønseth AS | | 2021 |
| Tørlen Eiendom AS | Real estate | 2013 |
| Tørrisblåsing Møre Og Romsdal AS | Administrative & support | 2022 |
| UFAS Holding AS | Manufacturing | 1996 |
| Ufo Eiendomsselskap AS | Construction | 1986 |
| Uih Invest AS | Professional & scientific | 2017 |
| Uksnøy & Co AS | Professional & scientific | 1980 |
| Uksnøy Barents AS | Transport & logistics | 2006 |
| Uksnøy Barents KS | Professional & scientific | 2006 |
| Uksnøy Løw AS | Professional & scientific | 2012 |
| Uldis Bygg AS | Construction | 2012 |
| Ullahytter AS | Real estate | 2005 |
| Ullevål Malermesterforretning AS | Construction | 1998 |
| Uls Design AS | Construction | 2020 |
| Uls Holding AS | Real estate | 2012 |
| Ulsteinvik Eiendom AS | Real estate | 2006 |
| Ulvest AS | Real estate | 2004 |
| Underholdning AS | Arts & recreation | 2026 |
| Uni Bygg AS | Construction | 2001 |
| Unimatec Eiendom AS | Real estate | 2005 |
| Unimatec Invest AS | Other services | 2005 |
| Union AS | Professional & scientific | 2013 |
| Unipro Vest AS | Manufacturing | 1998 |
| Uniseal AS | Wholesale & retail | 2015 |
| United Solutions AS | Professional & scientific | 2015 |
| Unitrykk AS | Manufacturing | 1979 |
| Universal Malerservice AS | Construction | 2024 |
| Unotrade AS | | 2018 |
| Up & Away Digital AS | Professional & scientific | 2020 |
| Upstun Bøle AS | Wholesale & retail | 2022 |
| Urmaker Karlsson AS | Wholesale & retail | 1995 |
| Urmaker Nelvik AS | Wholesale & retail | 1999 |
| Urno Holdning AS | | 2026 |
| Ustad Invest AS | | 2023 |
| Ut I Ålesund Management AS | Professional & scientific | 2023 |
| Utleid AS | Real estate | 2017 |
| Utrøna AS | Real estate | 2023 |
| V-Økonomi AS | Professional & scientific | 2018 |
| V.V Holding AS | | 2026 |
| Vaagen Innovation AS | Real estate | 2010 |
| Vadset Invest AS | | 2026 |
| Vaktmestertjeneste AS | Administrative & support | 2024 |
| Valdal Holding AS | Real estate | 2022 |
| Valdivia AS | Financial services | 2018 |
| Valebukta AS | Real estate | 2020 |
| Valento Media AS | Information & communication | 2021 |
| Valkyra AS | | 2024 |
| Valle Eiendomsutvikling AS | Real estate | 2016 |
| Vallegrenda Invest AS | Real estate | 2024 |
| Vanbjo Consulting AS | Professional & scientific | 2020 |
| Vard Design AS | Professional & scientific | 2000 |
| Vard Group AS | Manufacturing | 1998 |