| Tellus AS | Real estate | 1997 |
| Telsa Capital AS | Information & communication | 2020 |
| Tempo Tempo AS | Hospitality | 2022 |
| Ten Commandments AS | Real estate | 2005 |
| Tender AS | Real estate | 2005 |
| Tenold Invest AS | Information & communication | 2014 |
| Tenqual Ans | Information & communication | 2025 |
| Tenqual Software AS | Information & communication | 2026 |
| Tent AS | Real estate | 2000 |
| Tent Norge AS | Administrative & support | 2019 |
| Tentakel AS | Professional & scientific | 2026 |
| Teo Consult & Invest AS | Professional & scientific | 2015 |
| Tera 13 AS | | 2026 |
| Terapimasasje AS | Other services | 2022 |
| Terbo AS | | 2020 |
| Terje J Ledahl AS | Construction | 1988 |
| Terje Sivertsen Invest AS | Financial services | 2005 |
| Termaks Eiendomsselskap AS | Real estate | 1986 |
| Terminaltjenester AS | Transport & logistics | 2016 |
| Terminalvegen 7 AS | Real estate | 2012 |
| Termografi Og Måleteknikk - Bergen AS | Professional & scientific | 2003 |
| Terneveien 6 AS | Real estate | 2019 |
| Terneveien Boliglag AS | Households | 1955 |
| Terråk Kraftverk AS | Energy | 2020 |
| Terserus AS | Professional & scientific | 2009 |
| Tertnes Eiendom AS | Real estate | 2006 |
| Tertnes Regnskap AS | Professional & scientific | 2007 |
| Tesa Tech AS | Professional & scientific | 2006 |
| Tesdal J Holding AS | | 2020 |
| Tesdal M Holding AS | | 2020 |
| Tetris Holding AS | Real estate | 2018 |
| Tex Mex Ans | Hospitality | 1997 |
| Texture AS | Professional & scientific | 2026 |
| TF Akse Invest AS | Real estate | 2026 |
| TF Bank Nordic AB Nuf | Financial services | 2025 |
| TGR Byggservice AS | Construction | 2022 |
| Tgrh AS | Real estate | 2005 |
| TH Revisjon Og Regnskap AS | Professional & scientific | 2011 |
| Thai Town Eatery and Bar AS | Hospitality | 2025 |
| Thalassic AS | Arts & recreation | 2024 |
| Thale Tankers AS | Transport & logistics | 2021 |
| Thamson AS | | 2019 |
| Thb-Holding AS | | 2024 |
| The Accountant AS | Professional & scientific | 2026 |
| The Apothecary AS | Wholesale & retail | 1983 |
| The Bergenser AS | Wholesale & retail | 2026 |
| The Disciplines Da | Arts & recreation | 2008 |
| The Essential Ether Da | Arts & recreation | 2025 |
| The Face Queen AS | Other services | 2021 |
| The Foggy Few Da | Arts & recreation | 2005 |
| The Good Company AS | Professional & scientific | 2017 |
| The Hidden North AS | Administrative & support | 2023 |
| The Lab AS | Professional & scientific | 2016 |
| The Other End Da | Arts & recreation | 2017 |
| The Quest AS | Administrative & support | 2024 |
| The Red Line AS | Professional & scientific | 2022 |
| The Seafood Innovation Cluster AS | Other services | 2014 |
| The Vic AS | Hospitality | 2006 |
| The We Effect AS | Education | 2020 |
| Theben AG | Wholesale & retail | 2017 |
| Theni La AS | Hospitality | 2026 |
| Theodor Eiendom AS | Real estate | 1992 |
| Theodor Holding AS | | 2016 |
| Theotech AS | Real estate | 2022 |
| These Ways AS | Information & communication | 2019 |
| THG Holdings AS | | 2020 |
| Thi Invest AS | Financial services | 2014 |
| Think Hair Wear AS | Other services | 2004 |
| Think Hair Wear Fløybanen AS | Other services | 2005 |
| Think Hair Wear Galleriet AS | Other services | 1982 |
| Think Hair Wear Nonneseter AS | Other services | 2009 |
| Think Hair Wear Strandgaten AS | Other services | 2013 |
| Thinnitus Holding AS | Financial services | 2016 |
| This Is Crossfit AS | Arts & recreation | 2011 |
| Tho VVS AS | Construction | 2023 |
| Thomas Johannesen Eiendom AS | Real estate | 2023 |
| Thomas Johannesen Holding AS | | 2023 |
| Thomas Vervik Holding AS | Professional & scientific | 2014 |
| Thomas WG AS | | 2018 |
| Thomba AS | Professional & scientific | 2015 |
| Thor Holum Holding AS | | 2020 |
| Thorburn AS | Professional & scientific | 2024 |
| Thorgersen Business Consulting AS | Professional & scientific | 2025 |
| Thorli Eiendom AS | Real estate | 1995 |
| Thorli Holding AS | Financial services | 2005 |
| Thornström Brookfield Arkitekter AS | Professional & scientific | 2022 |
| Thorsnes Invest Limited Nuf | Financial services | 2008 |
| Three Chiefs AS | Real estate | 2003 |
| Three M AS | Real estate | 2006 |
| Three M Eiendom AS | Real estate | 2011 |
| Thue Ventures AS | | 2025 |
| Thule Sweden AB | Wholesale & retail | 2014 |
| THX Consulting AS | Health & social care | 2021 |
| Thyssenkrupp Materials Norge Nuf | Wholesale & retail | 1998 |
| Ti Amo Pizzeria AS | Hospitality | 2022 |
| Tiam AS | Information & communication | 1985 |
| Ticc AS | Information & communication | 2026 |
| Ticker Ans | Information & communication | 2001 |
| Ticketco AS | Information & communication | 2012 |
| Ticketco Nordic AB Nuf | Administrative & support | 2023 |