| Tckm Holding AS | Professional & scientific | 2020 |
| Teknikk Bygg Og Prosjektering AS | Professional & scientific | 2020 |
| Teknikk Bygg Og Tømrerfirma AS | Construction | 2014 |
| Teknisk Prosjektservice AS | Professional & scientific | 1987 |
| Telle's Penger AS | Construction | 2022 |
| Tempus Adventure AS | Professional & scientific | 2006 |
| Ten Talents Nuf | Arts & recreation | 2007 |
| Testinfo Essai AS | Information & communication | 1998 |
| TG15 Holding AS | | 2025 |
| Thomas Hassel Holding AS | | 2022 |
| Thomas Westvold AS | Wholesale & retail | 2017 |
| Tia Ynwa AS | | 2013 |
| Tillerion Holding AS | | 2025 |
| TKS 213 Holding AS | | 2023 |
| TMF Eiendomsutvikling AS | Real estate | 2026 |
| Toh Consulting AS | Administrative & support | 2018 |
| Topaas Maskin AS | Construction | 2025 |
| Tore Skaar AS | Professional & scientific | 2000 |
| Torsteinsen Design AS | Professional & scientific | 1997 |
| Travel Service AS | Professional & scientific | 2023 |
| Tribo AS | Construction | 1988 |
| Trio Holmedal AS | Health & social care | 2019 |
| TS Grøndahl AS | Wholesale & retail | 2008 |
| TT Elektro AS | Construction | 1987 |
| Tverdal Holding AS | Real estate | 2020 |
| Tømrermester Roy Sørensen AS | Construction | 2008 |
| Tønnerud Consulting AS | Wholesale & retail | 2014 |
| Universal Export Import Da | | 1988 |
| Upthere AS | Information & communication | 2023 |
| Urkraft AS | | 2014 |
| Verd AS | Financial services | 2015 |
| Verket Blomsterbinderi AS | Wholesale & retail | 2015 |
| Verket Interiør AS | Wholesale & retail | 1996 |
| Verket Lyd & Lys AS | Administrative & support | 2021 |
| Verket Mat AS | Hospitality | 2014 |
| Verket Sport AS | Wholesale & retail | 2014 |
| Verket Yoga Ans | Education | 2010 |
| Vertshuset BV AS | Hospitality | 2022 |
| Vib Drift AS | Professional & scientific | 2025 |
| Vigsnæs Michaelsen Consulting AS | Professional & scientific | 2015 |
| Vik Service Og Vedlikehold AS | Wholesale & retail | 2014 |
| Viking Arm AS | Professional & scientific | 2018 |
| Viking Arm Medical AS | Professional & scientific | 2021 |
| Villicus AS | Real estate | 1996 |
| Vissit AS | Real estate | 2005 |
| Vitoria Invest AS | Financial services | 2017 |
| Voigt AS | Construction | 1998 |
| Wabstra Invest AS | | 2025 |
| Wangestad Holding AS | | 2022 |
| Way Nor AS | Wholesale & retail | 2002 |
| Whatever Group AS | Hospitality | 2005 |
| Wilmato AS | | 2026 |
| With Eiendomstakst AS | Real estate | 2023 |
| X Holding AS | Wholesale & retail | 2023 |
| Ypsilon Holding AS | | 2023 |
| Ypsilon Invest AS | | 2023 |
| Ødegaard Consulting AS | Professional & scientific | 2005 |
| Økonomi Og Regnskapsservice AS | Financial services | 1988 |
| Øyli Bygg AS | Construction | 2006 |
| Øystein Røed AS | Professional & scientific | 2008 |