| Teft Holding AS | Financial services | 2009 |
| Teist AS | Professional & scientific | 1986 |
| TEK18 AS | Real estate | 2015 |
| Tekle Oppmåling AS | Professional & scientific | 2024 |
| Tekni AS | Construction | 2011 |
| Teknisk Sikkerhet Design AS | Professional & scientific | 2012 |
| Tekniskbureau AS | Construction | 2022 |
| Teksik AS | Professional & scientific | 2011 |
| Tekstil Service Ans | | 1989 |
| Tekton AS | Construction | 2025 |
| Teledyne Capital AS | | 2024 |
| Telemark Laser Avdeling Rogaland AS | Wholesale & retail | 2025 |
| Temar AS | | 2024 |
| Temi AS | | 2022 |
| Temoe Holding AS | Real estate | 2005 |
| Tempo Holding AS | Construction | 2011 |
| Tems Stavanger AS | Real estate | 2026 |
| Tendeka AS | Mining & quarrying | 2002 |
| Tengesdal Holding AS | Real estate | 2019 |
| Tengselven AS | Real estate | 1997 |
| Tenner Og Trivsel AS | Health & social care | 2026 |
| Tenora AS | Financial services | 2005 |
| Tensegrity AS | Health & social care | 2020 |
| Teppelageret AS | Wholesale & retail | 2000 |
| Teppelageret Eiendom AS | Real estate | 2004 |
| Teppespesialisten AS | Wholesale & retail | 1981 |
| TEQ7 AS | Wholesale & retail | 2017 |
| Ter Bron AS | Professional & scientific | 2025 |
| Terapihusene AS | Health & social care | 2022 |
| Teresoft AS | Information & communication | 2008 |
| Terica AS | Professional & scientific | 1990 |
| Term Pro Solutions AS | Administrative & support | 2026 |
| Termoprint AS | Manufacturing | 1984 |
| Terram AS | Arts & recreation | 2023 |
| Terran AS | Professional & scientific | 2021 |
| Terrascan AS | Professional & scientific | 2022 |
| Terratec AS | | 2024 |
| Terrebrune AS | Real estate | 2012 |
| Terroir AS | Wholesale & retail | 2002 |
| Tes Invest AS | Financial services | 2005 |
| Tete Invest AS | Real estate | 2008 |
| Tetraxis AS | Professional & scientific | 2005 |
| Tetsu Holding AS | | 2021 |
| Tettv AS | Health & social care | 2021 |
| Tex Inventions AS | Professional & scientific | 2020 |
| TF Investering AS | | 2022 |
| TFC AS | Real estate | 2020 |
| TFS Services AS | Administrative & support | 2018 |
| Tfø AS | | 2021 |
| TH Investering AS | Real estate | 2016 |
| TH Nyland Consulting AS | Professional & scientific | 2014 |
| TH Vaaland Granitt AS | Manufacturing | 1980 |
| Thai Dinner Asia AS | Hospitality | 2017 |
| Thai Isan Restaurant & Take Away AS | Hospitality | 2014 |
| Thai Jasmine Cuisine AS | Hospitality | 2018 |
| Thai Spicy AS | Hospitality | 2019 |
| Thai Take Away Stavanger AS | Hospitality | 2013 |
| Thames Management AS | Financial services | 1996 |
| The Empire Mirvan AS | Other services | 2022 |
| The Face Comes Second AS | Information & communication | 2021 |
| The Gym AS | Arts & recreation | 2022 |
| The Haciendas-Company AS | Wholesale & retail | 2012 |
| The Kit AS | Arts & recreation | 2012 |
| The Kitchen by Christophe AS | Other services | 2020 |
| The Line Atelier AS | Wholesale & retail | 2017 |
| The List Da | Arts & recreation | 2007 |
| The Mindsets Da | Arts & recreation | 2021 |
| The Mute Worldwide AS | Arts & recreation | 2019 |
| The Network AS | Administrative & support | 2023 |
| The Nordic Model AS | Professional & scientific | 2018 |
| The Norwegian National Barbecue Team AS | Education | 2011 |
| The Office Langesund AS | Real estate | 2024 |
| The Outfit AS | Information & communication | 2006 |
| The Percussion Collegium AS | Administrative & support | 2022 |
| The Phoenix F. AS | | 2021 |
| The Polymath Company AS | Professional & scientific | 2018 |
| The Rocky Bianco Band Da | Arts & recreation | 2012 |
| The Sky Is Not the Limit AS | Wholesale & retail | 2021 |
| The Taste Da | Hospitality | 2009 |
| The Vision AS | Professional & scientific | 2011 |
| The Vision Invest AS | Professional & scientific | 2016 |
| Thechic AS | Other services | 2025 |
| Themel AS | Professional & scientific | 2021 |
| Theo Eiendom AS | Real estate | 1999 |
| Theo Investering AS | Manufacturing | 2005 |
| Theosol AS | Wholesale & retail | 2023 |
| Thereses Gate 29 AS | Real estate | 2021 |
| Therizo Invest AS | Professional & scientific | 2012 |
| Thermoanimalis AS | Information & communication | 2026 |
| Thesania AS | Health & social care | 2007 |
| Theta Capital AS | Administrative & support | 2020 |
| THH Invest AS | Financial services | 2005 |
| Thidda Holding AS | | 2014 |
| Thiisabakken Eiendom AS | Real estate | 2007 |
| Thingspal AS | Information & communication | 2021 |
| Thinktank Maths Norge AS | Professional & scientific | 2021 |
| Thiqa Holding AS | | 2022 |
| Tho Hansen Holding AS | Financial services | 2018 |
| Thojo Holding AS | | 2021 |
| Thom AS | Financial services | 2018 |