| Tetra Invest AS | | 2025 |
| Tevi Invest AS | Real estate | 2006 |
| Tewi AS | Professional & scientific | 2024 |
| Teze AS | Wholesale & retail | 2024 |
| TG & HG AS | Hospitality | 2022 |
| TG 1 Takst AS | Professional & scientific | 2020 |
| TG26 Eiendom AS | Real estate | 2026 |
| Tga Holding AS | Real estate | 2016 |
| Tgroup AS | | 2012 |
| TH Konsulenten AS | Professional & scientific | 2021 |
| TH Reme AS | Real estate | 2005 |
| Thai Dishes AS | Hospitality | 2020 |
| Thai Thai Kristiansand AS | Hospitality | 2021 |
| Than AS | | 2020 |
| Tharaldsen AS | Wholesale & retail | 1997 |
| Tharaldsen Holding Kristiansand AS | Real estate | 2005 |
| Tharaldsen Invest AS | | 2020 |
| The Coordinators' Office Ans | Health & social care | 2011 |
| The Event AS | Administrative & support | 2023 |
| The Grapevine AS | Arts & recreation | 2015 |
| The King of Popcorn AS | Information & communication | 2012 |
| The Light Group AS | Wholesale & retail | 2014 |
| The Little House AS | Hospitality | 2019 |
| The Lost Arcade AS | Wholesale & retail | 2026 |
| The Man Cave Barber Lounge AS | Other services | 2018 |
| The Odd Bakery AS | Hospitality | 2021 |
| The Phi Corp AS | Information & communication | 2009 |
| The Umbrella Corporation AS | | 2021 |
| The Venture AS | | 2015 |
| The Winegroup AS | Wholesale & retail | 2018 |
| The World Institute of Slowness AS | Professional & scientific | 2007 |
| The Yogi and the Professor AS | | 2025 |
| Thea Invest AS | Real estate | 2023 |
| Them Girls AS | Information & communication | 2010 |
| Thema Solutions AS | Professional & scientific | 2024 |
| Thereselien AS | Arts & recreation | 2021 |
| Thiink AS | Wholesale & retail | 2021 |
| Thiink Holding AS | Real estate | 2021 |
| Thomas Frivold Invest AS | Financial services | 2005 |
| Thor Gunnar Åsheim AS | Financial services | 2009 |
| Thorkildsen Invest AS | Real estate | 1997 |
| Thorsen & Pedersen Ans | Construction | 1987 |
| Three Houses AS | Real estate | 2014 |
| Three Kings Eventbyrå AS | Administrative & support | 2017 |
| Thvs Invest AS | Real estate | 2022 |
| Thyr AS | Professional & scientific | 2024 |
| Ti Invest Holding AS | Real estate | 2006 |
| Tid AS | Other services | 2013 |
| Tik 99 AS | Financial services | 2021 |
| Tik AS | Financial services | 2017 |
| Tik Invest AS | Financial services | 2017 |
| Til Tak Sør AS | Administrative & support | 2017 |
| Tilbehørsportalen Da | Wholesale & retail | 2013 |
| Tilbring AS | Professional & scientific | 2021 |
| Tild AS | Information & communication | 2024 |
| Tileo AS | Professional & scientific | 2020 |
| Tilhengersenter Sør AS | Wholesale & retail | 2017 |
| Tilstede Mat Og Mer AS | Hospitality | 2011 |
| Tilstede Mat Og Mer Produksjon AS | Manufacturing | 2022 |
| Timenes AS | Manufacturing | 1963 |
| Timenes Holding AS | | 2026 |
| Tinde AS | Manufacturing | 2007 |
| Tindeweb AS | Information & communication | 2018 |
| Ting Eiendom AS | Real estate | 2012 |
| Tingeling Frisør AS | Other services | 2025 |
| Tingsaker Senter AS | Real estate | 1998 |
| Tinn Eiendom AS | Real estate | 2004 |
| Tinnheia Bil AS | Other services | 2004 |
| Tinnheia Bistro AS | Hospitality | 2025 |
| Tinnheia Fysioterapi AS | Health & social care | 1984 |
| Tinnheia Tannlegekontor AS | Health & social care | 1987 |
| Tinnheiveien 30 AS | Real estate | 2010 |
| Tipitina Holding AS | | 2019 |
| Tivo Holding AS | Professional & scientific | 2024 |
| Tiwaz AS | Professional & scientific | 2024 |
| Tjelland AS | | 2025 |
| Tjke Holding AS | | 2022 |
| TJT Invest AS | Information & communication | 2005 |
| Tjønnvoll Eiendom AS | Real estate | 2014 |
| TK Service Tore Karlsen AS | Construction | 2016 |
| Tkba AS | Real estate | 2021 |
| Tkms GmbH | Professional & scientific | 2005 |
| TL A/S | Professional & scientific | 1988 |
| TLC 4 AS | Wholesale & retail | 2011 |
| Tle Invest AS | | 2026 |
| TLJ Holding AS | Construction | 2021 |
| TLS AS | Construction | 2023 |
| TM73 Invest AS | Wholesale & retail | 2024 |
| Tmcap AS | Administrative & support | 2025 |
| Tmesh AS | Information & communication | 2020 |
| TMJ Eiendom AS | Real estate | 2022 |
| TMJ Entreprenør AS | Construction | 2019 |
| Tmns AS | Professional & scientific | 2021 |
| Tmsn Invest AS | Health & social care | 2007 |
| TMT Eiendom AS | Real estate | 2023 |
| Tmtec AS | Manufacturing | 2017 |
| TN Invest Sør AS | Real estate | 2008 |
| TNB Vågsbygd AS | Wholesale & retail | 2018 |
| TNC Productions AS | Information & communication | 2009 |
| To Eiendomsutvikling AS | Real estate | 2020 |