| Taurus Eiendom Holding AS | Financial services | 2016 |
| Tautdanning AS | Administrative & support | 2002 |
| Taxi Flexi AS | Transport & logistics | 2018 |
| Taxi Skejo AS | Transport & logistics | 2018 |
| Taxi U-176 AS | Transport & logistics | 2018 |
| Taxnes Holding AS | Financial services | 2014 |
| TB Holding Trondheim AS | | 2022 |
| TB Utvikling AS | Professional & scientific | 2007 |
| TBL Invest AS | Financial services | 2016 |
| TBN Boligrigg AS | Real estate | 2017 |
| TC Engineering AS | Wholesale & retail | 2019 |
| TC Holdings AS | Professional & scientific | 1996 |
| TCB Fische AS | | 2026 |
| TCN Distribusjon AS | Wholesale & retail | 2020 |
| TD Research AS | Professional & scientific | 2014 |
| Tdog Enterprises AS | | 2022 |
| Te Og Kaffehuset AS | Wholesale & retail | 1981 |
| Te Og Kaffehuset Oslo AS | Wholesale & retail | 2025 |
| Tea Time Holding AS | | 2023 |
| Team Atlas Da | Administrative & support | 2002 |
| Team Maritime AS | Manufacturing | 2016 |
| Team Midgard AS | Information & communication | 2019 |
| Team Robust AS | Education | 2024 |
| Team Trondheim BJJ AS | Education | 2019 |
| Teater Basun Ans | Arts & recreation | 2020 |
| Teatermat AS | Hospitality | 2014 |
| Tech Delivery AS | Professional & scientific | 2014 |
| Tech Fusion AS | Information & communication | 2025 |
| Tech Hugs AS | Hospitality | 2017 |
| Tech-Global AS | Information & communication | 2024 |
| Technimar AS | Professional & scientific | 2023 |
| Techtron Nor AS | Professional & scientific | 2023 |
| Tectra AS | Information & communication | 2012 |
| Tefol Holding AS | | 2025 |
| Tefoss Holding AS | | 2024 |
| Teglverket 1 AS | Real estate | 2012 |
| Tegnetanken AS | Professional & scientific | 2019 |
| Teh Holding AS | Financial services | 2017 |
| Teigaas Transport AS | Transport & logistics | 2022 |
| Teil Invest AS | | 2017 |
| Tej AS | | 2023 |
| Tekam AS | Construction | 2013 |
| Tekam Boligutleie AS | Real estate | 2024 |
| Tekam Telecom Og Elektro AS | Construction | 2015 |
| Teknoconzult AS | Professional & scientific | 2005 |
| Teko Technologies AS | Information & communication | 2025 |
| Tekst Og Musikk AS | Arts & recreation | 1983 |
| Tekøk Invest AS | | 2005 |
| Tel AS | Health & social care | 2012 |
| Tele-Land Service AS | Construction | 2014 |
| Tele-Land Svakstrøm Norge AS | Wholesale & retail | 2008 |
| Telecom Norden AS | Wholesale & retail | 2002 |
| Telekiosken Trøndelag AS | Wholesale & retail | 2005 |
| Telescope Peak AS | Professional & scientific | 2015 |
| Tellefsens Gate 1 AS | Real estate | 2018 |
| Teller Animation AS | Information & communication | 2026 |
| Tellus Eiendom AS | Real estate | 1997 |
| TELME2 AS | Professional & scientific | 2011 |
| Telstø Invest AS | Financial services | 2007 |
| Tema Eiendom AS | Real estate | 1995 |
| Tema Tur AS | Administrative & support | 2007 |
| Tematanken AS | Professional & scientific | 2021 |
| Temo Holding AS | Real estate | 2005 |
| Tempe Auto AS | Other services | 2000 |
| Tempe Barnehage SA | Education | 1999 |
| Tempe Blikk Holding AS | Construction | 2020 |
| Tempe Blikk Og Ventilasjon AS | Construction | 2020 |
| Tempe Blikk Service AS | Construction | 2026 |
| Tempe Defence AS | Professional & scientific | 2026 |
| Tempe Dekk AS | Other services | 2021 |
| Tempe Frisør AS | Other services | 2024 |
| Tempe Lekepark Da | Health & social care | 1996 |
| Tempe VVS Senter AS | Wholesale & retail | 1994 |
| Tempero Energitjenester AS | Professional & scientific | 2012 |
| Tempevegen 25 AS | Real estate | 2018 |
| Tempevegen 8 AS | Construction | 2018 |
| Tempeveien 15 AS | Real estate | 1940 |
| Tempeveien 15 Eiendom AS | Real estate | 2018 |
| Tempeveien 19 AS | Real estate | 1999 |
| Tempeveien 23 AS | Real estate | 2014 |
| Tempo Nerbyen AS | Real estate | 2007 |
| Temroc AS | | 2022 |
| Tems Holding AS | | 2026 |
| Tendbakk AS | | 2025 |
| Tendro AS | Information & communication | 2022 |
| Tengb Holding AS | | 2019 |
| Tenk Smart Regnskap AS | Administrative & support | 2024 |
| Tenk Trykk Da | Administrative & support | 2016 |
| Tensio TS AS | Energy | 1997 |
| Tensionsafe AS | | 2024 |
| Tensor Innovation Group AS | | 2025 |
| Teos Labb AS | Wholesale & retail | 2026 |
| Teraz AS | Professional & scientific | 2025 |
| Terbium Invest AS | Financial services | 2014 |
| Tereda Holding AS | Financial services | 2005 |
| Terje Gran AS | Professional & scientific | 1999 |
| Terje Skjønhals AS | Professional & scientific | 1998 |
| Terminalveien 7 Berkåk AS | Real estate | 2018 |
| Terra Contact AS | Administrative & support | 2005 |
| Terra Group AS | | 2024 |