| Terra Preta AS | Professional & scientific | 2010 |
| Terrenglos AS | Information & communication | 2026 |
| Texbay AS | Real estate | 2023 |
| Thermokraft AS | Energy | 1999 |
| Thor E. Grotle Transport AS | Transport & logistics | 2014 |
| Thorwald's Kjøkken Da | Manufacturing | 1995 |
| Tinco AS | Manufacturing | 2006 |
| Tindetoppen AS | Administrative & support | 2023 |
| Tindetoppen Holding AS | Administrative & support | 2022 |
| Tinfos AS | Energy | 1894 |
| Tinfos Eiendom AS | Real estate | 2010 |
| Tinfos Entreprenør AS | Construction | 2000 |
| Tinfos Hidro AS | Professional & scientific | 2019 |
| Tinfos Hydro 2 AS | Professional & scientific | 1995 |
| Tinfos Hydropower Solutions AS | Energy | 2019 |
| Tinfos Strøm AS | Energy | 2023 |
| Tinne Invest AS | | 2005 |
| Tjønnheim Holding AS | | 2018 |
| TK Andersen Da | Construction | 2007 |
| TK Ventilasjonsteknikk AS | Construction | 2018 |
| Tka AS | Construction | 2013 |
| TM & Hene SA | Wholesale & retail | 2020 |
| TMT Dagligvare AS | Wholesale & retail | 2012 |
| TNB Notodden AS | Wholesale & retail | 2025 |
| Toget Work AS | Information & communication | 2025 |
| Tolisol-Vegen | Real estate | 1988 |
| Tommy Johansen AS | Wholesale & retail | 2023 |
| Tommy Johansen Tuven AS | Wholesale & retail | 2025 |
| Tommys Bilpleie Og Bilformidling Da | Other services | 2004 |
| Tone Ingrid Bakken AS | | 2020 |
| Tone S Fotterapi AS | Health & social care | 2019 |
| Topp Kebab AS | Hospitality | 2020 |
| Tor Inge Tøftvang AS | Construction | 2023 |
| Toreso AS | Professional & scientific | 2012 |
| Torgeir Kasin AS | Construction | 2018 |
| Torjesen Invest AS | | 2025 |
| Torvet 1 Eiendom AS | Real estate | 2012 |
| Total-Entreprenøren AS | Construction | 2024 |
| Toves Neglverksted & Fotpleie AS | Other services | 2019 |
| TP Anleggsteknikk AS | Construction | 2021 |
| TPD Eiendom AS | Real estate | 2018 |
| Triar Invest Ara Nuf | Real estate | 2016 |
| Trivselshytta AS | Construction | 2012 |
| Trond Alvestad AS | Wholesale & retail | 2016 |
| Trustfrated AS | Professional & scientific | 2023 |
| TRW Holding AS | Financial services | 2005 |
| Tråer & Sætre Skogsdrift AS | Agriculture & fishing | 2019 |
| Trønnes Invest AS | | 2020 |
| Trønnes Medical AS | Health & social care | 2020 |
| TTV AS | Other services | 2025 |
| Tuddal Eiendomsutvikling AS | Real estate | 2006 |
| Turistbakken AS | Real estate | 2021 |
| Tuven Barn AS | Wholesale & retail | 2011 |
| Tuven Billakkering AS | Other services | 2010 |
| Tuven Bilpleie Da | Other services | 2014 |
| Tuven Bilservice AS | Other services | 2018 |
| Tuven Bilskade Eiendom AS | Real estate | 2008 |
| Tuven Bilskade Eiendom Holding AS | Real estate | 2026 |
| Tuven Næringseiendom AS | Real estate | 2017 |
| Tuvenbøygen Eiendom AS | Real estate | 1998 |
| Tveiten-Eiendom AS | Real estate | 2009 |
| Tvervik Billakkering AS | Other services | 2007 |
| Tødden Eiendom AS | Real estate | 2023 |
| Tømrer Erlend Hegna AS | Construction | 2020 |
| Tømrer Torgeir Bakken AS | Construction | 2020 |
| Tømrer Vegard Aas AS | Construction | 2015 |
| Urdalen Systems AS | Information & communication | 2016 |
| Utleiegruppen AS | Real estate | 1997 |
| Utleiegruppen Bolig AS | Real estate | 2017 |
| Utleiegruppen Drift AS | Administrative & support | 2020 |
| Utleiehytter AS | Real estate | 2021 |
| V Ryen AS | Construction | 2019 |
| Vaa Diesel Auto AS | Wholesale & retail | 2009 |
| Vaa Diesel Eiendom AS | Wholesale & retail | 1981 |
| Vannfronten Eiendom AS | Real estate | 2001 |
| VBF Invest AS | | 2026 |
| Vcon AS | Professional & scientific | 2008 |
| Vebakk AS | Real estate | 2020 |
| Vel AS | Other services | 2024 |
| Ventilen Sykkel & Service AS | Wholesale & retail | 2026 |
| Vestfold VVS Bedrift AS | Construction | 2025 |
| Veveriet Næringshage AS | Real estate | 2002 |
| Vi Integrerer AS | Health & social care | 2016 |
| Vi Ser Deg AS | Information & communication | 2021 |
| Vidar Kulturhus Heddal SA | Real estate | 1995 |
| Viking Investor Ltd | Wholesale & retail | 2022 |
| Villa Håp Holding AS | Manufacturing | 2021 |
| Villamoen Barnehage AS | Education | 2022 |
| Villaveien 5 AS | Real estate | 1974 |
| Visory Norway AS | Information & communication | 2025 |
| Vista Estate AS | Real estate | 2007 |
| Viwa Tek AS | Professional & scientific | 2022 |
| VSR Eiendom AS | Real estate | 2024 |
| VT Import AS | Wholesale & retail | 2026 |
| Watchoutinvest AS | | 2024 |
| Webavdelingen AS | Information & communication | 2013 |
| Wegolf Norway Nuf | Information & communication | 2008 |
| Welli AS | Wholesale & retail | 2021 |
| Westcontrol Berget AS | Manufacturing | 1987 |
| White Tail Flight Training AS | Education | 2026 |